OPERATING MANUAL 1. ADF Memory As with the other radio types, the radio tuning function supports 12 ADF memories displayed on two pages. In addition to entering or dialing--in frequencies for each memory, a text label of up to 8 characters may be entered for each stored frequency. The default label for each memory is ”MEMORY”, a dash, and the memory number, with the memory number always on the outboard edge of the display. The ADF Memory page is described below.
OPERATING MANUAL These sections display the ADF memories 1--3 (7--9 on ADF MEMORY 2/2). This section displays and controls the Active ADF frequency on the selected radio (the field title will reflect which radio was selected). Pushing LSK 1L copies the field containing the format cursor into the active frequency and moves the previously active frequency into the preset field (not shown on this page). A scratchpad entry into the field replaces the preset frequency with the previous active frequency.
OPERATING MANUAL 2B-- 09-- 70: MLS1 PAGE The 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 provides access to the MLS memory pages. Figure 43 Unlike the detail pages for the other radios, the MLS page does not support the fast memory tuning operation in field 3L.
OPERATING MANUAL 1.
OPERATING MANUAL 2B-- 09-- 80: RADIO INTERACTIONS The MCDU radio tuning function communicates with the radio units using a bi--directional protocol. The radio tuning function expects to receive an acknowledgement when the radio is 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 awaits confirmation.
OPERATING MANUAL 2B-- 09-- 90: ANNUNCIATION MESSAGES 1. RADIO 1/2 Annunciations A variety of annunciations appear on the radio tuning pages, many of which are shown in Figure 46.
OPERATING MANUAL Table 33 describes the annunciators on RADIO 1/2. Annunciator Description 25K Indicates that the associated VHF COM radio is set to 25KHz frequency spacing. When not present, the radio is tuning with 8.33KHz frequency spacing. DME H xxx This alert Indicates that the VHF navigation radio is tuning the corresponding DME receiver independently of the primary navigation frequency.
OPERATING MANUAL 2. RADIO 2/2 Annunciations A variety of annunciations appear on the radio tuning pages, many of which are shown in in Figure 46.
OPERATING MANUAL Table 34 describes the annunciators on RADIO 2/2. Annunciator Description ANT The ADF radio is in antenna mode. ARM An MLS procedure is armed. BFO The ADF radio is operating in BFO mode. CW This annunciator Indicates that the radio is currently transmitting. IHBT Indicates that tuning of the radio is inhibited, usually from a remote source (such as an emergency tuning function).
OPERATING MANUAL 3. Scratchpad Messages The scratchpad messages described in table , may be generated by the radio tuning function. In the process of implementing this function, other required messages may come to light. Table 34 describes the annunciators on RADIO 2/2. Annunciator Description DELETE This annunciator Indicates that the value in the scratchpad is deleted. INVALID ENTRY This annunciator Indicates that the entry in the scratchpad is invalid.
OPERATING MANUAL 2B-- 09-- 100: DIGITAL AUDIO PANEL The digital audio panel controls the audio levels and switching for communication between the aircraft and ground, between the cockpit and cabin, and among the flight crew in the cockpit. The Digital Audio Panel is an audio panel that operates off the radio system’s digital audio bus.
OPERATING MANUAL To 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 adjust the volume of the received audio and side tone. When communicating using the SATCOM system, the audio panel has annunciations that indicate an incoming call, a call on hold, and when a call is being connected. SATCOM can also be used to make a call.
OPERATING MANUAL Figure 48 The primary interfaces for the audio panel are the two pairs of Digital Audio Buses from the MRCs (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. They contain identical data. The MRC includes the Primus II EPIC radio modules and a NI--900 Network Interface Module (NIM).
OPERATING MANUAL The MIC buses contain multiplexed digital audio samples and control data sent between audio panels and the Audio Processing Card (APC) inside the NIM. Each unit on the bus transmits in a pre--determined sequence.
OPERATING MANUAL The audio panel us used to select microphones (Boom/Hand or MASK mic) and to connect the desired radio to the selected microphone. The audio panel interfaces with the MRC over two bi--directional multiplexed Digital MIC busses (both busses contain identical data for system redundancy). These busses are used for intercom communication in the aircraft, exchanging status information, communicating configuration changes, sounding warning tones and providing SELCAL functionality.
OPERATING MANUAL 4. Audio Control Panel Switches and Controls The controls and indicators on the audiot panel are described below. EMER (Emergency) Microphone Switch -- When the EMER switch is pushed the following occurs: D The on--side microphone is connected directly to the emergency VHF COM. D The emergency VHF COM received audio is connected directly to the on--side headphone.
OPERATING MANUAL COM 1, 2, 3 and HF1, 2 Buttons -- The audio feedback to the pilot is controlled by the audio selector button immediately below the microphone button for that radio. When a radio microphone is selected, the audio feedback is limited to a minimum level even if the volume set by the audio selector button is zero. This assures that a transmission does not occur before listening.
OPERATING MANUAL MIC Switch -- The oxygen mask microphone is selected when this switch is latched out. When it is latched in, the boom microphone is selected. SET Window Display -- The display, which is referred to as the SET window, is the primary means with which the audio panel provides feedback to the pilot. One of the major uses of the display is to present volume levels of selected audio channels and visual feedback of volume level adjustments.
OPERATING MANUAL State Description NO 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 active audio channel and the corresponding volume control DEFAULT HDPH SET window displays the nomenclature for the button assigned to headphone and the corresponding level DEFAULT SPKR SET window displays the nomenclature for speaker and the corresponding volume level TRANSMIT SET window di
OPERATING MANUAL NAV 1,2,3 -- If the audio panel is in receive mode and the NAV selector is selected, the audio panel amplifies the NAV signal by the gain value set by the pilot before outputting it to the headphones or speakers. If the audio panel is on--side transmit, the audio panel mutes the NAV audio to the speaker and headphone. If the NAV volume setting is set to zero, the audio panel closes the squelch bit of the NAV channel. Otherwise, the audio panel opens the squelch bit of the NAV channel.
OPERATING MANUAL MKR (Marker) /MUTE Buttons -- The audio panel provides one control interface for the louder marker of the two incoming marker tones. The audio panel mutes the weaker marker. If the audio panel is in the receive operation and the marker volume control is set below the minimum gain, the marker audio is set to the minimum gain value.
OPERATING MANUAL Emergency (EMER) Microphone Switch -- When the EMER button is pushed, the following occurs: D The on--side microphone is connected directly to the emergency VHF COM. D The emergency VHF COM received audio is connected directly to the on--side headphone. D The emergency VOR/ILS audio is also connected directly to the on--side headphone (provided it has been selected by the NAV AUDIO button on the backup control head).
OPERATING MANUAL Emergency (EMER) Microphone Switch -- When the EMER button is pushed, the following occurs: D The on--side microphone is connected directly to the emergency VHF COM. D The emergency VHF COM received audio is connected directly to the on--side headphone. D The emergency VOR/ILS audio is also connected directly to the on--side headphone (provided it has been selected by the NAV AUDIO button on the backup control head).
OPERATING MANUAL SELCAL Button -- An incoming call is displayed when the SELCAL annunciator flashes. Also the microphone and the audio button for the called radio flashes. Resetting to turn off the flashing annunciators is done by pushing the SELCAL button. The SELCAL button, when pressed, shows the SELCAL code on the audio panel display.To attend the call, the microphone button for the called radio is selected and PTT enabled.
OPERATING MANUAL ICS (Intercom System) Button -- Pushing the ICS button lights the button and 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. SPKR (Speaker) -- Pushing the SPKR button, lights the button and SPKR is displayed in the display with a relative volume level number.
OPERATING MANUAL H’MIC Switch -- Pushing the H’MIC button lights the button and H’MIC is displayed in the SET display with a relative volume level number. When the H’MIC switch is latched out, the on’side microphone acts as the hot mike for intercome. In the latched in position, the on--side mike is connected to the intercom PTT switch. Adjusting the SET knob sets the headset volume level for all audio inputs. ST (Side Tone) -- Pushing the ST button, lights the button .
OPERATING MANUAL SAT Buttons -- The two SAT buttons are used to control the SATCOM telephone system. The rectangular button flashes and a chime sounds to indicate an incoming SATCOM call. Both the round and rectangular buttons go on steadily when the line is in use. The rectangular button is used to connect and disconnect the SATCOM calls. The pilot disconnects SATCOM by pushing the rectangular button again. At this time, all SATCOM annunciator lights go off.
OPERATING MANUAL CABN Button -- When CABN is pushed, the SET display shows CABN CALL, and the annunciator button flashes until the call is picked up by the flight attendant. At this time, the display shows the characters denoting CABN and a number between 0 and 100 denoting the volume.The Digital Audio System interfaces with the Passenger Address System in order to allow the flight crew in the cockpit to perform passenger announcements, to communicate with the flight attendants and to provide call chimes.
OPERATING MANUAL 5. Operational Modes The audio panel operates in one of five of modes: D Normal Operational Mode. D Software Loading Mode D Backup (BKUP) Mode. D Configuration Mode D APC Test Mode A. Normal Operational During normal operation, the audio panel consists of 30 audio channels some of which are dedicated and others which can be customized by the pilot.
OPERATING MANUAL D. Intercom The Intercom function is used so crew memebers can talk to each other on the selected cockpit intercom, cabin intercom, or maintenance intercom, when they are not using a COM radio. Transmission on the intercom is enabled by either selecting intercom PTT or enabling a hot mic function. An Intercom volume control is provided to attenuate audio from the intercom.
OPERATING MANUAL K. APC Test Mode An APC test mode is is used to validate nominal autio panel operation. While in this test mode the audio panel continuously echoes back a test pattern to the requesting NIM. When the NIM stops requesting, the testing stops and the audio panel returns to normal operation. (I don’t see a TEST button.