Honeywell TR865A Aviation VHF Transceiver User Manual Manual part 2

Honeywell International Inc. Aviation VHF Transceiver Manual part 2

Contents

Manual part 2

OPERATING MANUAL2B-09-00Page 39Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS1. ADF MemoryAs with the other radio types, the radio tuning function supports 12 ADF memories displayedon two pages. In addition to entering or dialing--in frequencies for each memory, a text labelof up to 8 characters may be entered for each stored frequency. The default label for eachmemory is ”MEMORY”, a dash, and the memory number, with the memory number alwayson the outboard edge of the display. The ADF Memory page is described below.Labels are entered by typing into the scratchpad and pushing the LSK adjacent to the desiredfrequency. If the radio tuning function determines that the entry is a valid frequency for theradio, the entry is accepted into the frequency field. If not, the entry is considered a label andis entered into the label field above the frequency. A label can be replaced by making anotherscratchpad entry into a memory field, or by pushing the DEL key. Pushing the DEL keyplaces the text ”DELETE” in the scratchpad and, when entered on a memory field, deletesthe associated text label, returning it to the default. If the DEL key is used on a memory wherethere is no user--entered label, the frequency is deleted from memory.Access to the ADF MEMORY 2/2 page is via the NEXT and PREV function keys.
OPERATING MANUAL2B-09-00Page 40Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSThis section displays and controls the Active ADF frequency on theselected radio (the field title will reflect which radio was selected).Pushing LSK 1L copies the field containing the format cursor into theactive frequency and moves the previously active frequency into thepreset field (not shown on this page). A scratchpad entry into the fieldreplaces the preset frequency with the previous active frequency.These sections display the ADF memories 1--3 (7--9 on ADF MEMORY 2/2).These sections display the ADF memories 4--6 (10--12 on ADFMEMORY 2/2).Pushing this LSK displays ADF detail page.Pushing this LSK displays the RADIO 2/2 page.
OPERATING MANUAL2B-09-00Page 41Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS2B--09--70: MLS1 PAGEThe MLS page, shown in Figure 43, shows the currently tuned procedure and a preset,azimuth and back--azimuth, and glidepath angle, and allows setting of the operating mode(automatic/manual) and azimuth selection (azimuth or back--azimuth). It also providesaccess to the MLS memory pages.Figure 43Unlike the detail pages for the other radios, the MLS page does not support the fast memorytuning operation in field 3L.
OPERATING MANUAL2B-09-00Page 42Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS1. MLS Memory PagesThe MLS memory pages, FINISH THIS SECTIONFigure 44
OPERATING MANUAL2B-09-00Page 43Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS2B--09--80: RADIO INTERACTIONSThe MCDU radio tuning function communicates with the radio units using a bi--directionalprotocol. The radio tuning function expects to receive an acknowledgement when the radiois successful in completing each tuning command.A typical interaction begins with the user entering or dialing in a new frequency for a radio.The MCDU sends the appropriate tuning command to the specified radio and awaitsconfirmation. If no confirmation is received within the timeout period, the frequency displayon the page is changed to amber and a scratchpad message is issued as shown in Figure45).Figure 45The pilot can attempt to tune the radio again, in the event that the fault was transient or hasbeen cleared by crew action. This is also important in the event that the radio is receiving thecommand and is, in fact, tuning the radio, but is unable to respond to the MCDU.
OPERATING MANUAL2B-09-00Page 44Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS2B--09--90: ANNUNCIATION MESSAGES1. RADIO 1/2 AnnunciationsA variety of annunciations appear on the radio tuning pages, many of which are shown inFigure 46.Figure 46
OPERATING MANUAL2B-09-00Page 45Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSTable 33 describes the annunciators on RADIO 1/2.Annunciator Description25KIndicates that the associated VHF COM radio is set to 25KHzfrequency spacing. When not present, the radio is tuning with8.33KHz frequency spacing.DME H xxxThis alert Indicates that the VHF navigation radio is tuning thecorresponding DME receiver independently of the primarynavigation frequency.IHBTThis annunciator Indicates that tuning of the radio is inhibited,usually from a remote source (such as an emergency tuningfunction).MICSTKIndicates that the microphone button on the radio has beendown long enough that the radio has identified it as ”stuck” in thetransmit position.SQThis annunciator Indicates that the squelch feature for the radiois active.TXThis annunciator Indicates that the radio is currentlytransmitting.RADIO 1/2 Annunciator DescriptionsTable 33
OPERATING MANUAL2B-09-00Page 46Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS2. RADIO 2/2 AnnunciationsA variety of annunciations appear on the radio tuning pages, many of which are shown in inFigure 46.Figure 47
OPERATING MANUAL2B-09-00Page 47Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSTable 34 describes the annunciators on RADIO 2/2.Annunciator DescriptionANTThe ADF radio is in antenna mode.ARMAn MLS procedure is armed.BFOThe ADF radio is operating in BFO mode.CWThis annunciator Indicates that the radio is currentlytransmitting.IHBTIndicates that tuning of the radio is inhibited, usually from aremote source (such as an emergency tuning function). In thecase of two HF radios sharing a single antenna, transmittingand/or receiving may be inhibited periodically when the other HFradio has recently performed a transmit operation.ITUThis annunciator Indicates that the radio is currentlytransmitting.LOThe radio is set to low squelch.MAn MLS parameter has been set manually.MEDThe radio is set to medium squelch.RXIndicates that the radio is currently receiving.SQThis annunciator Indicates that the squelch feature for the radiois active.TXThis annunciator Indicates that the radio is currentlytransmitting.TX LOThe radio is transmitting with low power.TX MEDThe radio is transmitting with medium power.VOICEThe ADF radio is in voice mode.WARNThere is a problem with the azimuth, back--azimuth, or glidepathdata for the MLS procedure.RADIO 2/2 Annunciator DescriptionsTable 34
OPERATING MANUAL2B-09-00Page 48Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS3. Scratchpad MessagesThe scratchpad messages described in table , may be generated by the radio tuningfunction. In the process of implementing this function, other required messages may cometo light.Table 34 describes the annunciators on RADIO 2/2.Annunciator DescriptionDELETEThis annunciator Indicates that thevalue in the scratchpad is deleted.INVALID ENTRYThis annunciator Indicates that theentry in the scratchpad is invalid.SQNO RESPONSE FROM RADIOThis annunciator Indicates that thesquelch noise is coming from the radio.STUCK MICROPHONEThis annunciator Indicates that themicrophone key is stuck.RADIO 2/2 Annunciator DescriptionsTable 35
OPERATING MANUAL2B-09-00Page 49Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS2B--09--100: DIGITAL AUDIO PANELThe digital audio panel controls the audio levels and switching for communication betweenthe aircraft and ground, between the cockpit and cabin, and among the flight crew in thecockpit.The Digital Audio Panel is an audio panel that operates off the radio system’s digital audiobus. Each crew audio panel station can be equipped with a stereo headset including boommicrophone, an oxygen mask microphone, a push to talk (PTT) switch, a hand--heldmicrophone with PTT and dedicated stereo cockpit speakers.The audio panel works with the Primus EPIC Modular Radio Cabinet (MRC) system andnetwork interface module. Radio audio output digitization occurs within the NI--900 in theremote mounted modular radio cabinet (MRC), even for radios such as the HF and SATCOMwhich are not inherently part of the MRC system. There is no separate remote mountedaudio integrating line repair unit (LRU) required. Audio is transmitted digitally from eachside’s cabinet on a shielded twisted wire pair to all audio panels in the system. There are twoaudio buses from each cabinet and audio buss configuration (single bus or dual bus) isprogram dependent. All audio from an MRC is contained on both digital audio busses.The audio panel is used for microphone switching to the selected radio over a pair ofredundant digital microphone audio buses to the NI--900. The NI--900 converts themicrophone digital audio data back to analog audio to apply to the selected radio’s MIC input.Digital encoding of the microphone signals near the source reduces the installation criticalityin avoiding noise and hum pick--up in the audio system.The audio panel is used to operate intercoms in the cockpit, cabin or maintenance personneldigitally over the microphone buses. Aural Warning signals can be input into the NI--900 oraudio panel for output on the cockpit speakers or headphones. A cockpit voice recorder(CVR) output and an option for CVR control is included on the audio panel.1. Audio Panel’s Role Within The CockpitThe audio panel interfaces between the pilot’s microphone, cockpit speakers, andheadphones to the respective audio systems in the aircraft such as communicationtransceivers, navigation receivers, and intercom systems. In addition to the above, the audiopanel has an intercom function that allows the crew to communicate between themselves.It also supports the Selective Calling (SELCAL) function, interfaces with the Cockpit VoiceRecorder (CVR), and directs the aural warning audio to the headphones and speakers.
OPERATING MANUAL2B-09-00Page 50Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSTo interface with the communication transceivers (VHF COMM radios, HF radios, SATCOM,etc) the audio panel is used to to select the transmitting radio , the listening radio, and adjustthe volume of the received audio and side tone. When communicating using the SATCOMsystem, the audio panel has annunciations that indicate an incoming call, a call on hold, andwhen a call is being connected. SATCOM can also be used to make a call.To interface with the navigation receivers (VOR, DME, Marker Beacon, ADF, etc) the audiopanel can select the listening receiver and adjust the audio volume of the received audio.Additionally, the audio panel can apply filters to the received audio to only allow the NAVAIDIDENTs or Voice to be heard over the receiver.To interface with the intercom systems such as the cabin communication system, the audiopanel can be used to adjust the cabin audio volume, initiate a call to the cabin and toannounce that a call to the cockpit is being made. The audio panel has two channels for cabinintercom communications. The first is the normal intercom channel that is designed tohandle routine dialogue. The second is an emergency channel is that is designed to indicateand handle emergency dialogues. The emergency channel has priority over the normalintercom channel, so it can interrupt conversations already in progress. However, a normalintercom call cannot interrupt an emergency call.In addition to interfacing with the cabin communication system, the audio panel has fourintercom channels and two maintenance (MAINT) channels that are used to communicateamong the flight crew or with the maintenance personnel. This function is performed withoutthe use of a system, external to the audio panel. This intercom feature allows the flight crewto use their respective PTT switches, or their VOX levels to initiate the conversation. Withthe audio panel, the pilots can select which channel to use and can adjust the volume of theaudio heard in their respective headset.Miscellaneous features of the audio panel include the ability to select between the oxygenmask microphone or the boom microphone, the ability to select a backup mode which allowsthe flight crew to communicate with a transceiver directly, bypassing the audio panel digitalelectronics altogether. Additionally, the audio being directed to the headphones andspeakers is output directly to the CVR for recording and subsequent accident investigationand aural warnings output by the Aural Warning system are directed, by the audio panel, tothe headphones and cockpit speakers.2. System LRU DescriptionThe audio panel Digital Audio Panel hardware can switch microphones to various radios,allow intercom communication, and control the cabin and maintenance intercoms.Amplifiers drive headphones, cockpit/cabin speakers and CVR audio outputs. A single sideaudio system block diagram for Primus EPIC is shown in Figure 48.
OPERATING MANUAL2B-09-00Page 51Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSFigure 48The primary interfaces for the audio panel are the two pairs of Digital Audio Buses from theMRCs (One pair from each MRC) and the two redundant Digital Microphone (MIC) buses.Both MIC buses are connected to each audio panel and each MRC in the system. Theycontain identical data.The MRC includes the Primus II EPIC radio modules and a NI--900 Network Interface Module(NIM). The NIM contains the audio to digital converters and multiplexing capability to convertthe internal and external radio audio outputs to digital signals on its Digital Audio Bus Output.The Digital Audio Bus output from each MRC (NI--900) goes to all audio panels in the system.The Digital Audio Buses from each MRC contain identical multiplexed digital audio samplesfrom the radios internal and external to the MRC. The audio panel de--multiplexes audiodata, sets levels and converts the selected digital audio samples to analog signals to beapplied to the headphone, speaker and CVR outputs.
OPERATING MANUAL2B-09-00Page 52Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSThe MIC buses contain multiplexed digital audio samples and control data sent betweenaudio panels and the Audio Processing Card (APC) inside the NIM. Each unit on the bustransmits in a pre--determined sequence.In addition to source and destination addresses, data on each MIC bus consists of thefollowing:Data from audio panel to APCDSelected microphone audioDPTT statusDCommands/Responses to Commands to/from NIMsDData from APC to audio panelDCommand data from ASCB--DAural Warning audio from the MAU or other sourcesDSELCAL incoming dataDCommands/Responses to Commands to/from audio panelDData from audio panel to other audio panelsDIntercom channel audioDPTT statusDCommands/Responses to Commands to/from other audio panelsThe NIM contains data interfaces from the audio panel MIC buses to the ASCB--D bus andfrom the ASCB--D bus to the Digital Audio Bus, to control and display data to and from theMAU and Display units.The NIM also contains audio system interfaces to the following equipment:DExternal radio equipment such as HF, a 3rd COM, NAVCOM, Radio telephone andSATCOM.DAural Warnings from the MAU, or other equipment such as TCAS.DCabin Call interface to the flight attendant stations.DExternal Passenger Address System.DPBX interface for Radio--Telephones such as the Magna--Star systemDCVR Interface3. General System RequirementsThe primary functional requirement for the Digital Audio Panel audio panel is to provide gaincontrol for numerous communication and navigation audio signals by reading switches, potsand the encoder on the front of the audio panel and providing attenuation of selected audiosignals proportional to the settings. The audio panel also contains hardware for switchingmicrophones to various radios and for producing fire bell warning audio. Amplifiers areprovided for driving headphones, speakers, and the cockpit voice recorder. The audio panelhas the ability to route critical signals to the headphones without power.A. Operation DescriptionThe audio panel receives digitized audio from the remote radio units through one, oroptionally two, pairs of Digital Audio Buses (DABs). Each bus carries data from one ModularRadio Cabinet (MRC). Digitized audio is routed to the Audio DSP’s serial port where it isdecoded. The Audio DSP modifies the gain (volume) of the various channels, sums thechannels together and performs various filter functions on the audio. The audio then leavesthe Audio DSP and is amplified and routed to the speakers, headphones and CVR . Theaudio panel also provides for warning tone amplification.
OPERATING MANUAL2B-09-00Page 53Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSThe audio panel us used to select microphones (Boom/Hand or MASK mic) and to connectthe desired radio to the selected microphone. The audio panel interfaces with the MRC overtwo bi--directional multiplexed Digital MIC busses (both busses contain identical data forsystem redundancy). These busses are used for intercom communication in the aircraft,exchanging status information, communicating configuration changes, sounding warningtones and providing SELCAL functionality.The audio panel can route critical signals to the backup COM without power.The audio panel consists of three types of buttons:DRectangular buttons for transceiversDRound buttons for audioDSquare buttons for discretes.The controls include the following:DNine microphone selection buttons with green LED (light emitting diode) annunciatorswhich indicate the state of the function controlled by the button (MIC -- rectangular)-Rectangular and ridged rectangular buttons are used for microphone selection ofassociated transceivers such as VHF1 (COM1), VHF2 (COM2), HF1, HF2,SATCOM, and PA.-Ridged rectangular buttons are used for frequently used transceivers which mayneed to be used in emergency situations such as VHF1, VHF2, and PA. Theseridged rectangular buttons are the same size as the rectangular microphone buttonselections but have a ridge on the perimeter of the button so that the button can befound by feel in low visibility situations.-Buttons assigned to VHF COM1, and VHF COM2 are designated as SELCALchannels. This means that when the respective SELCAL channel is enabled thetransceiver annunciates to the pilot that a SELCAL call has been detected. Thesebuttons support three annunciator states; steady illumination, flashing, and OFF.Incoming SELCAL calls are indicated with a flashing LED.-When any of these channels are not SELCAL enabled they operate in the standardfashion whereby the annunciator toggles between OFF and ON for everyrespective button push. Additionally, the annunciator is extinguished shouldanother rectangular button be pushed.-Depending on configuration and if SELCAL is enabled, on VHF COM 1 and 2 andMIC buttons, the annunciator toggles OFF and ON with a short button push (pushand hold for less than one second). When a long button push (push and hold forone second or longer) is detected the response is slightly different. If theannunciator is OFF and a long button push is detected on the respective button theannunciator turns ON. However, if it is ON and long button push is detected theannunciator remains ON (the purpose is to bring up the display of a feature alreadyselected without turning it off).When any of the channels are not SELCAL enabled they operate in the standardfashion whereby the annunciator toggles between ON and OFF for every respectivebutton push. Additionally, the annunciator is turned off when another rectangularbutton is pushed.
OPERATING MANUAL2B-09-00Page 54Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS4. Audio Control Panel Switches and ControlsThe controls and indicators on the audiot panel are described below.EMER (Emergency) Microphone Switch -- When the EMER switch is pushedthe following occurs:DThe on--side microphone is connected directly to the emergency VHFCOM.DThe emergency VHF COM received audio is connected directly to theon--side headphone.DThe emergency VOR/ILS audio is also connected directly to the on--sideheadphone (provided it has been selected by the NAV AUDIO switch on thebackup control head).NOTES: 1. The specification of COM 1, 2, or 3 and VHF NAV 1, 2, or 3 asthe emergency radios is dependent on aircraft wiring.2. Audio warnings are broadcast through the cockpit speaker.3. Microphone audio, emergency phone audio, and warning audioare broadcast to the cockpit voice recorder output.4. Panel lighting remains lit if power is lost to the audio panel.
OPERATING MANUAL2B-09-00Page 55Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSCOM1,2,3andHF1,2Buttons-- The audio feedback to the pilot is controlledby the audio selector button immediately below the microphone button for thatradio. When a radio microphone is selected, the audio feedback is limited to aminimum level even if the volume set by the audio selector button is zero. Thisassures that a transmission does not occur before listening.Normally, the displayshows the radio ID and a number between 0 and 100 showing the relative volumelevel for that audio channel.If another audio panel is talking on that radio, thedisplay shows BUSY and that radio transmit function is temporarilydisabled.When a radio is selected and PTT is pushed, the display shows thecharacters representing that radio and TX (for transmitting).If PTT is enabled forlonger than the time--out time (two minutes), the radio transmit function isdisabled and the display shows Stuck Mic (STK MIC).When a microphoneselector button is deselected by pushing it when it is on, or by selecting anothermicrophone button, both the microphone annunciator and the audio selectorannunciator below it and the audio from that channel go off.
OPERATING MANUAL2B-09-00Page 56Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSMIC Switch -- The oxygen mask microphone is selected when this switchis latched out. When it is latched in, the boom microphone is selected.SET Window Display -- The display, which is referred to as the SETwindow, is the primary means with which the audio panel providesfeedback to the pilot. One of the major uses of the display is to presentvolume levels of selected audio channels and visual feedback of volumelevel adjustments. For example, when the COM1 audio selector button ispushed, the display may show the text, COM1: 47.The text COM1indicates the button’s function and the text 47 is the variable volume settingfor the COM1 channel.The display, showing SPKR: 2O, is an eight character display used toindicate the selected radio (COM1,NAV2, etc.) master headphone(HDPH), or master speaker (SPKR) volume, which is controlled with theSET knob, and its current relative volume setting (1--99).The primary action that defines the text displayed in the SET window is thepushing of the rectangular microphone buttons, round audio buttons,square discrete selector buttons, the turning of the SET knob, and thepushing of the push--to--talk buttons. In addition to these actions, many ofthe displays in the SET window are timed, reverting to a default display aftera timeout period has expired.The display can also indicate other status, setup, and test information. Thelogic for the text displayed in the SET window is captured in the statemachine which is made up of eight display states; NO SOUND, ACTIVEAUDIO, DEFAULT HDPH, DEFAULT SPKR, TRANSMIT, and NOTRANSMIT. Table 36 lists the states and includes a description of thesestates.
OPERATING MANUAL2B-09-00Page 57Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSState DescriptionNO SOUND(STUCK MICROPHONE)NO SOUND is displayed in the SET window(STUCK MICROPHONE replaces the NO SOUND state)ACTIVE AUDIO SET window displays the nomenclature for the activeaudio channel and the corresponding volume controlDEFAULT HDPH SET window displays the nomenclature for the buttonassigned to headphone and the corresponding levelDEFAULT SPKR SET window displays the nomenclature for speaker andthe corresponding volume levelTRANSMIT SET window displays the nomenclature for the buttonassigned to the active radio with the text TX in place ofthe volume indication. This annunciates that this radio istransmittingNO TRANSMIT SET window displays the text NO TX to indicate to thepilot that no radio is currently selected for transmissionACTIVE DISCRETE SET window displays the nomenclature for the activediscrete nomenclature that corresponds to the squarebutton pushedSPECIAL SET window display is controlled by requirements due tothe special nature of the display needsSET Window AnnunciationsTable 36When an audio button is pushed the SET window displays the nomenclature for the buttonpushed. This display exists for the display time which is set in the configuration database.When this time is exceeded the SET window reverts to the default display which is either thenomenclature/volume of the headphone or the speaker provided these buttons have beenselected.After the display has reverted to the default display or another audio button has been pushed,the SET window can be returned to a previous selection by using a long button push. Thisbrings up the display of a feature already selected without turning it off.Headphone (HDPH) and speaker (SPKR) buttons are special forms of audio buttons. Theiruniqueness is due to the fact that their SET window display is the default display. Forexample, if the ADF 1 button is pushed the nomenclature for the ADF 1 is displayed in theSET window. However, if the display time limit in the configuration database is exceeded theSET window reverts to the default display, either the nomenclature for the speaker orheadphone. Additionally, there is a priority between the two default displays. Headphone haspriority over speaker since this is the most likely to be used by the flight crew.The SET window display logic adjusts slightly when a stuck microphone condition isdetected. Under this circumstance the default displays of headphone and speaker go away,the NO SOUND display goes away being replaced by STUCK MICROPHONE text. Thisprovides a reminder to the flight crew that the microphone PTT is defective and anothermeans of communication with the radios should be found.The SET window special state is used for various functions such as FONE and STUCKMICROPHONE which have special display needs to support the function. The SET windowdisplay can be entered from any state and returns to the state as previously described.
OPERATING MANUAL2B-09-00Page 58Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSNAV 1,2,3 -- If the audio panel is in receive mode and the NAV selector isselected, the audio panel amplifies the NAV signal by the gain value set by thepilot before outputting it to the headphones or speakers.If the audio panel is on--side transmit, the audio panel mutes the NAV audio tothe speaker and headphone.If the NAV volume setting is set to zero, the audio panel closes the squelch bitof the NAV channel. Otherwise, the audio panel opens the squelch bit of theNAV channel.ADF 1, 2 -- When the ADF audio selector is selected, theaudio panel amplifies the ADF signal by the gain value set bythe pilot before outputting it to the headphones or speakers.If the audio panel is on--side transmit, the audio panel mutesthe ADF audio to the speaker and headphone.If the ADF volume setting is set to zero, the audio panelcloses the squelch bit of the ADF channel. Otherwise, theaudio panel opens the squelch bit of the ADF channel.
OPERATING MANUAL2B-09-00Page 59Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSMKR (Marker) /MUTE Buttons -- The audio panel provides one controlinterface for the louder marker of the two incoming marker tones. The audiopanel mutes the weaker marker.If the audio panel is in the receive operation and the marker volume control isset below the minimum gain, the marker audio is set to the minimum gain value.If the marker selector is selected, the audio panel amplifies the marker signalby the gain value set by the pilot before outputting it to the headphones orspeakers.If the audio panel is on--side transmit, the audio panel mutes the marker audioto the speaker and headphone.If the marker volume setting is set to zero, the audio panel closes the squelchbit of the marker channel. Otherwise, the audio panel opens the squelch bit ofthe marker channel.The marker tones are muted when the pilot pushes the MUTE button. Themarker audio remains muted as long as the marker audio level is above themute level preset in the configuration. When marker audio drops below mutelevel, the marker audio remains muted for five seconds. If the mute button ispushed during this five second window, the marker audio is muted for 20seconds. If the marker audio goes above the mute level during this 20--secondperiod, the marker audio remains muted as long as the marker audio is abovethe mute level.DME -- If the audio panel is in receive mode and the DME selector is selected, theaudio panel amplifies the DME signal by the gain value set by the pilot beforeoutputting it to the headphones or speakers.If the audio panel is on--side transmit, the audio panel mutes the DME audio to thespeaker and headphone.If the DME volume setting is set to zero, the audio panel closes the squelch bit of theDME channel. Otherwise, the audio panel opens the squelch bit of the DME channel.
OPERATING MANUAL2B-09-00Page 60Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSEmergency (EMER) Microphone Switch -- When the EMER button is pushed,the following occurs:DThe on--side microphone is connected directly to the emergency VHFCOM.DThe emergency VHF COM received audio is connected directly to theon--side headphone.DThe emergency VOR/ILS audio is also connected directly to the on--sideheadphone (provided it has been selected by the NAV AUDIO button onthe backup control head).In addition to the above emergency operations, the Audio Panel EMER switchdoes the following:DAudio warnings are broadcast through the cockpit speaker.DMicrophone audio, emergency phone audio, and warning audio arebroadcast to the cockpit voice recorder output.DPanel lighting remains lit if power is lost to the audio panel.When EMER is selected, headphone volume is controlled by the on--sideheadphone volume control. The EMER button disables all other audio panelcontrols.ID Button -- When the ident filter (ID) is enabled by pushing the ID button, a filteris activated that eliminates the voice on VOR and ADF audio. The annunciatoron the button is on when the filter is active. When the ident filter is deselected,voice and ident are available. The annunciator is off.
OPERATING MANUAL2B-09-00Page 61Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSEmergency (EMER) Microphone Switch -- When the EMER button is pushed,the following occurs:DThe on--side microphone is connected directly to the emergency VHFCOM.DThe emergency VHF COM received audio is connected directly to theon--side headphone.DThe emergency VOR/ILS audio is also connected directly to the on--sideheadphone (provided it has been selected by the NAV AUDIO button onthe backup control head).In addition to the above emergency operations, the Audio Panel EMER switchdoes the following:DAudio warnings are broadcast through the cockpit speaker.DMicrophone audio, emergency phone audio, and warning audio arebroadcast to the cockpit voice recorder output.DPanel lighting remains lit if power is lost to the audio panel.When EMER is selected, headphone volume is controlled by the on--sideheadphone volume control. The EMER button disables all other audio panelcontrols.ID Button -- When the ident filter (ID) is enabled by pushing the ID button, a filteris activated that eliminates the voice on VOR and ADF audio. The annunciatoron the button is on when the filter is active. When the ident filter is deselected,voice and ident are available. The annunciator is off.
OPERATING MANUAL2B-09-00Page 62Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSSELCAL Button -- An incoming call is displayed when the SELCALannunciator flashes. Also the microphone and the audio button for the calledradio flashes. Resetting to turn off the flashing annunciators is done by pushingthe SELCAL button. The SELCAL button, when pressed, shows the SELCALcode on the audio panel display.To attend the call, the microphone button forthe called radio is selected and PTT enabled.CVR (Cockpit Voice Recorder) Button -- When thisbutton is pushed, the audio is output to the CVR. Theoutput comes from the following sources:DUnsquelch audio signals from eachboom, mask,or hand microphone in useDAudio sent to the cockpit speakerDAudio sent to the pilot’s headphoneSET Knob -- The common volume control knob adjusts thevolume of the most recently selected audio or the one that isdisplayed in the display window. Adjusting the knob clockwiseincreases the volume. The relative volume is shown on as anumber between 01 an 99 on the SET display.
OPERATING MANUAL2B-09-00Page 63Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSSPKR (Speaker) -- Pushing the SPKR button,lights the button and SPKR is displayed in thedisplay with a relative volume level number.Adjusting the volume control sets the speakervolume level for all audio inputs. Each one canstill be individually controlled when its audiobutton is pusheded and its ID displayed.HDPH (Headphone) -- Pushing the HDPH button lights thebutton and HDPH is displayed in the SET display with arelative volume level number. Adjusting the SET knob setsthe headset volume level for all audio inputs. Each one canstill be individually controlled when its audio button is pressedand its ID displayed.ICS (Intercom System) Button -- Pushing the ICS button lights the buttonand ICS is displayed in the SET display with a relative volume level number.This enables the intercom system so the crew can talk with each other.Adjusting the SET knob sets the headset volume level for all audio inputs.
OPERATING MANUAL2B-09-00Page 64Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSST (Side Tone) -- Pushing the ST button, lightsthe button . With sidetone active, the sidetonesin the crew’s headsets can be adjusted byturning the ST button.H’MIC Switch -- Pushing the H’MIC button lights the button and H’MIC isdisplayed in the SET display with a relative volume level number. When theH’MIC switch is latched out, the on’side microphone acts as the hot mike forintercome. In the latched in position, the on--side mike is connected to theintercom PTT switch. Adjusting the SET knob sets the headset volume levelfor all audio inputs.MAINT Button -- Pushing a button on the pilot’s left console sounds a hornin the nose wheel well to summon maintenance personnel. When MAINT isselected on the audio panel, and hot microphone is enabled, the pilotmicrophone signal is routed to the headset in the nose wheel. There areprovisions for three maintenance interphone connections.When MAINT isselected, the display shows MAINT CALL, and the annunciator buttonflashes until the call is picked up by the ground crew. At this time, the displayshows the characters denoting RAMP and a number between 0 and 100representing the volume level.If another audio panel is talking on the ramp,the display shows BUSY and the ramp function is disabled.
OPERATING MANUAL2B-09-00Page 65Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSPA (Passeger Address) Buttons -- The two PA buttons are used to controlthe aircraft’s passenger address system.When the rectangular button ispushed, the button lights, and the round button also lights to indicate that thePA is in use. The pilot’s current mike is connected to the PA system andannouncments to the passenger compartment can be made. PA volume iscontrolled by the round PA button. The pilot pushes to unlatch the rectangularbutton to turn off the PA system. Both button annunciators go off.SAT Buttons -- The two SAT buttons are used to control the SATCOMtelephone system. The rectangular button flashes and a chime sounds toindicate an incoming SATCOM call. Both the round and rectangular buttons goon steadily when the line is in use. The rectangular button is used to connectand disconnect the SATCOM calls. The pilot disconnects SATCOM by pushingthe rectangular button again. At this time, all SATCOM annunciator lights go off.
OPERATING MANUAL2B-09-00Page 66Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSCABN Button -- When CABN is pushed, the SET display shows CABN CALL, andthe annunciator button flashes until the call is picked up by the flight attendant. Atthis time, the display shows the characters denoting CABN and a number between0 and 100 denoting the volume.The Digital Audio System interfaces with thePassenger Address System in order to allow the flight crew in the cockpit toperform passenger announcements, to communicate with the flight attendants andto provide call chimes. The call chimes are annunciated at the beginning of the callfrom the cockpit to the flight attendants and vice--versa. The chimes are alsoannunciated before the pilots or flight attendants make announcements to thepassengers.If another audio panel is talking to the cabin, the display shows”BUSY” and the cabin function is disabled.FONE, XFER and CONF Buttons -- These buttons areassociated with the MAGNASTAR phone system. Theirfunctions are TBD.
OPERATING MANUAL2B-09-00Page 67Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMS5. Operational ModesThe audio panel operates in one of five of modes:DNormal Operational Mode.DSoftware Loading ModeDBackup (BKUP) Mode.DConfiguration ModeDAPC Test ModeA. Normal OperationalDuring normal operation, the audio panel consists of 30 audio channels some of which arededicated and others which can be customized by the pilot. The 30 channels are used tosupport the following functions during Normal mode operations:DRadio ReceiverDRadio TransceiverDIntercomDCVRDPADTelephonyDSELCALThe aural warning function is supported by the audio panel based upon inputs from the NIM.The audio panel controls audio and transmission to the following:DTwo dedicated VHF channelsDEight auxiliary transceiver channelsDFive intercom channelsDOne maintenance intercom channelDDedicated navigation audio channelsDFour auxiliary navigation audio channelsDA single CVR channel.The dedicated navigation receivers are the VOR, VIDL, ADF, Marker (MKR), DME, and MLS.B. Radio ReceiverRadio receiver audio channels support radio reception only (i.e. VHF NAV, ADF, MKR, MLSand DME). These channels receive digitized, multiplexed audio data from the MRC over thedigital audio busses. The audio panel decodes, filters, applies gain to the selected digitizedchannels, converts the samples to analog audio, and outputs the analog audio to theHeadphones, Speakers, and CVR.C. Radio TransceiverRadio transceiver audio channels support reception and transmission of audio on both thededicated and auxiliary transceiver channels. The received audio from these transceiversis received on the digital audio buses from the MRC radio cabinet. The audio panel decodes,filters and amplifies/attenuates, convert the samples to analog audio, and outputs the analogaudio on the Headphones, Speakers and CVR output ports.The transmitted audio is sent to the MRC radio cabinet over the MIC bus. The audiooriginating from the selected microphone is sampled, digitized, filtered, amplified/attenuated,and multiplexed onto the MIC bus. Additionally, a sidetone is created for feedback to thecrewman either through the headset or through the speakers on the flight deck or both.
OPERATING MANUAL2B-09-00Page 68Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSD. IntercomThe Intercom function is used so crew memebers can talk to each other on the selectedcockpit intercom, cabin intercom, or maintenance intercom, when they are not using a COMradio. Transmission on the intercom is enabled by either selecting intercom PTT or enablinga hot mic function. An Intercom volume control is provided to attenuate audio from theintercom. It operates in the same manner as the transceiver volume controls, except thatthe intercom output is sent to the headphones only if the mask microphone is not being used.If the mask microphone is being used, the intercom output is sent to the speakers.E. Cockpit Voice Recorder (CVR)The audio panel sums and outputs the following signals to the CVR:DAudio output from the cockpit speakers including warnings.DAudio output from the headphone outputs including warnings.DAudio input from the selected microphone.In addition to the summing and outputting of audio to the CVR, the audio panel also containsCVR control features. From the audio panel the crew can initiate the CVR erase and testfunctions which are hosted by the CVR equipment.F. Passenger Address (PA)The audio panel can be used to provide an internal Passenger Address (PA) function or itmay be used to select and support an external PA function. Internal selection allows the flightcrew to make an announcement to the cabin. A crew member is able to transmit on the PAoutput by selecting and keying the PA microphone button.The audio panel external PA function is initiated by assigning an auxiliary transceiver to thisfeature and connecting it to an external PA system via the MRC radio cabinet.G. TelephonyThe audio panel interfaces with all telephonic equipment on board the aircraft through theMRC and provides the necessary telephonic functions through this interface. The telephonicfunctions contained in the audio panel are call pick--up, call hang--up, call transfer, and callhold. These are done using the front panel buttons.H. Selective Call (SELCAL)Using the Selective Call (SELCAL) function, the crew can receive calls from a ground stationdesignated to the aircraft. The audio panel is the interface for the pilot to set theaircraft--unique SELCAL code designated for the aircraft. Selecting the code is possible onlywhen the aircraft is on the ground. The SELCAL code selection can also be performed usingthe CCD and displays and transmitting to the MRC NIMs via ASCB. The NIMs encode theSELCAL code on the DIGITAL MIC Bus.The SELCAL code is displayed on the audio panel by selecting the SELCAL button.I. Aural WarningsThe audio panel sums and outputs the following audio signals to speakers, headphones andCVR output:DWarning Audio from the analog warning inputs.DWarning Audio from the MIC bus inputs.J. Software LoadingSoftware is loaded (by manufacturing or authorized Honeywell support centers) into theaudio panel before the audio panel is installed aboard an aircraft, or it is loaded by executingan on--aircraft software loading sequence. The on--aircraft loading sequence requires theaudio panel to be in the software loading mode.
OPERATING MANUAL2B-09-00Page 69/(70 blank)Nov 15/02DIGITAL AUTOMATIC FLIGHT CONTROL SYSTEMSK. APC Test ModeAn APC test mode is is used to validate nominal autio panel operation. While in this test modethe audio panel continuously echoes back a test pattern to the requesting NIM. When theNIM stops requesting, the testing stops and the audio panel returns to normal operation. (Idon’t see a TEST button.)

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