Transcript
Page TABLE OF CONTENTS
05-00-01/02
DESCRIPTION General
05-10-01
Description
05-10-01
Controls and Indicators
05-10-02
COMPONENTS (Not Used)
CONTROLS AND INDICATORS
05-30-01
FUNCTIONAL SCHEMATICS (Not Used)
JL Feb 1/75
05-00-01/02
GENERAL
HF and VHF communications equipment, SELCAL, АТС transponder, passenger address (PA), and interphone systems (flight maintenance, service, cabin, and galley), comprise the basic communications system. The cockpit voice recorder, passenger entertainment tape recorder/player, and passenger movies are considered as ancillary systems. The cockpit pedestal contains the central audio controls for the VHF radios, SELCAL, and АТС systems. Flight crew control of the HF radios, cockpit voice recorder, interphone call system, and PA system is centralized on the overhead panel. DESCRIPTION HF COMMUNICATIONS SYSTEM
The HF radio provides air/ground and air/air voice communications. Frequency selection is made at the HF remote control panels. There are two HF communication systems. Both HF-1 and HF-2 may be monitored simultaneously, however, side tone audio is received at both HF-1 and HF-2 positions simultaneously (all audio panels) when either HF-1 or HF-2 transmitter is keyed and interlock relay limit transmission to one system at a time. CAUTION;
DO NOT OPERATE THE HF RADIO(S) DURING REFUELING. THERE IS A POSSIBILITY OF EXPLOSION.
VHF COMMUNICATION SYSTEM
The VHF radio provides air/ground and air/air voice communications. Frequency selection is made at the
JL Sep 1/89
VHF remote control panels. There are three VHF transceivers, control panels, and antenna systems which permit simultaneous VHF operations. SELCAL SYSTEM
A dual SELCAL unit operates in conjunction with the HF and VHF transceivers to provide a selective visual and aural alert signal to the flight crew that a ground station desires contact. The SELCAL System consists of a decoder unit, an aural alert unit, and a SELCAL control panel. Failure of any SELCAL unit will not affect the normal operation of the associated HF or VHF transceivers. AIR TRAFFIC CONTROL (АТС) TRANSPONDER
The АТС transponder automatically provides a positive aircraft signature on the ground АТС radar when interrogated. The coded reply, in addition to an altitude signal, is selectable. The control panel provides for testing the system, selection of the operating mode and coded reply, altitude signal, and manual transmission of the identification pulse if desired. AUDIO PANELS
The audio panel integrating system provides selectable monitoring of communication/navigation radio inputs and control of radio transmitter outputs. A switch for selecting either a boom or oxygen mask microphone and a switch for selecting amplifier No. 1 or 2 are provided. Push buttons permit selection of voice or range filters for VOR/ADF monitoring. Audio panels, for individual control of the integrating system, are provided.
05-10-01
COCKPIT VOICE RECORDER The cockpit voice recorder automatically records crew conversation and transmissions whenever electrical power is on the aircraft. System design permits bulk erase only when aircraft is on the ground with the parking brake set.
CONTROLS AND INDICATORS The controls, indicators, and annunciator lights are on the Pedestal, the Overhead Panel, Flight Engineer's Upper Panel No. 3 and Lower Instrument Panel, and First Observer's station. Illustrations of these major panels are in Chapter 1. The individual controls and indicators are illustrated and described in another section of this chapter.
05-10-02
JL May 1/81
HF Frequency Select Knob Large, outer knob controls selection of whole megahertz. Small, inner knob controls selection of tenths of a megahertz.
HF Function Selector (2) OFF - Turns system off. AM - Selects amplitude modulation mode. USB — Selects upper sideband mode. LSB - Selects lower sideband mode.
VHF Frequency Readout (2) Window indicates selected VHF frequency.
HF Frequency Indicator (2) Indicates selected HF frequency.
HF Frequency Select Knob (2) Small, inner knob controls selection of hundredths of a megahertz. Large, outer knob controls selection of thousandths of a megahertz.
HF PANEL HF TUNE Light (2) Comes on during tuning cycle.
VHF TFR Switch Permits operator to communicate on either of the selected VHF frequencies.
SQ Control Knob (2) Rotate to control sensitivity of HF receiver.
VHF Comm Selected lights (2) Indicates which VHF frequency is in use.
COMM TEST Button Pushing button w i l l disable squelch circuit to verify VHF receiver reception. VHF Frequency Selector (2) Small, inner selector knob controls second and third digits of VHF frequency. First digit is not selectable. Large, outer selector knob controls fourth and fifth digits of the VHF frequency.
JL May
1/81
VHF COMM PANEL ON/OFF Switch Used to turn system on and off.
05-30-01
SELCAL Button (2) Integral light comes on in conjunction with call bell when called by ground station. Button is pushed to turn off light and stop ringing of call bell or, to test lamp.
MARKER Selector Permits operator to increase (HI) or decrease (LO) the sensitivity of the marker beacon receiver.
SELCAL Selector (2) Permits operator to select the HF or VHF channel to be monitored by either SELCAL-1 or SELCAL-2.
Transponder Selector STBY — A p p l i e s power to the transponder but inhibits any response to an interrogation signal. ON — Allows transponder to reply to interrogation signals. LO — Reduces gam of transmitter SENS to prevent overloading close by ground receivers.
Code Readout Indicates selected digital code.
Mode Selector Selects transponder mode of operation. Transponder will only reply to an interrogation signal, if the mode of that signal is the same as the mode selected. ALT RPTG Switch When on, coded pulse transmission provides an altitude display to the ground controller.
АТС Switch Permits selection of transponder 1 or 2. Code Selector Knob (2) Controls the transponder code selection. The large knobs control digits one and four. The small knobs control digits two and three.
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IDENT Button Pushing button provides a supplementary pulse for augmented identification on the ground radar display. The transmission will last for approximately 20 seconds.
TEST Button Pushing button simulates a transponder ground signal. If system is operating correctly the MONITOR light will come on.
MONITOR Light Indicates transponder is replying to a ground station interrogation signal or self test.
Nov
JL 1/78
PA VOL Meter Indicates audio level when passenger address system is in use. Needle is off scale to the left when PA system is not transmitting. Needle fluctuates when PA is being used.
PA ON Switch/Light Pushing the switch/light when the handset is removed from the cradle will connect the handset to the PA system. Lower half will come on blue whenever handset is connected to the PA system. Replacing handset in the cradle or pushing any interphone call switch, will disconnect handset from the PA system and connect it to the interphone system and the blue light will go off.
MAINT INTPH Switch When the s w i t c h is in MAINT INTPH position the flight crew can c o m m u n i c a t e , using the handset on aft pedestal, with ground maintenance personnel at any of the ground interphone lack locations. When the switch is in the OFF position all exterior maintenance interphone jacks are deactivated and ground personnel may talk to the cockpit through the flight interphone jacks on the nose landing gear strut and at the external power panel.
JL Nov
1/78
RESET Button Pushing the RESET button will turn off the blue call lights.
Interphone Station Calling Switch/Light (6) Pushing any switch/light will turn on the call light, and sound a chime at that station. Switches have white background lighting. When the cockpit is called from any interphone station a chime will sound and the respective lower half of the call light will come on blue. Returning the handset to the cradle or pushing the RESET button will turn off the blue call light. All interphone stations are interconnected and any station may be monitored from any other station by lifting the handset at that station. Handset A handset is on the aft pedestal in the cockpit. The handset contains an audio receiver, microphone, and a press-to-talk switch. Communication between the cockpit and the cabin attendant stations or maintenance interphone jack outlets is established by removing the set from the hanger. Pressing the press-totalk switch in the handset permits transmission.
Pilot's Control Wheel Microphone Switch (3-position) Maintained in the center (off) position and momentary in the forward (interphone) and aft (radio) positions. Pulling aft, keys radio transmission circuit for boom or mask microphone as selected by the microphone selector buttons (audio panel). Pushing f o r w a r d , keys interphone transmission for boom or mask microphone.
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There are two cockpit speakers installed, one on each side of the overhead panel. A volume control is located in the center of the speaker. A speaker OFF switch is incorporated in the volume control.
Cockpit Monitor Microphone Actuated by audible sounds in the cockpit. Sounds are transmitted to recorder containing a 30 minute loop tape.
TEST Button When pushed, the test light will come on, after a delay, indicating the cockpit voice recorder system is operative.
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ERASE Button When pushed and held for 6 seconds, tape will be erased. A i r plane must be on the ground and parking brake set.
TEST Light Comes on shortly after the TEST button is pushed.
Headset Jack Permits monitoring of recorded signals by plugging headset into jack.
Feb
JL 1/82
Test Monitor Meter Indicates recording level during test. When TEST Button is pushed, meter will indicate a minimum of 8.
Cockpit Monitor Microphone Actuated by audible sounds in the cockpit. Sounds are transmitted to recorder containing a 30 minute loop tape.
JL Feb
1/82
TEST Button When pushed, a timed test signal is applied to recorder at preset intervals for each channel. Complete test cycle is approximately 5 seconds duration and is accompanied by an aural tone in the headset.
ERASE Button When pushed and held for 2 seconds, tape will be erased. Bulk erase is accompanied by an aural tone in the headset. Airplane must be on the ground and parking brake set. NOTE: Do not hold for longerthan 5 seconds.
HEADSET Jack Permits monitoring of recorded signals by plugging headset into jack.
05-30-05
Microphone Selector Button (7) Push to select transmission medium. Integral light comes on to indicate selection. Because of mechanical interlock, only one button can be latched down at a time.
On/Off/Volume Control Knob (14) Push to monitor audio signal, push again to discontinue monitoring, rotate to select the desired volume. All receiving media can be monitored at the same time. Side tone audio is received at both HF-1 and HF-2 positions at the same time when either HF-1 or HF-2 transmitter is keyed.
OXY/BOOM MIC Selector OXY - Connects mask microphone to selected transmitting medium. BOOM - Connects boom microphone to selected transmitting medium.
RANGE and VOICE Knobs RANGE - Push in to filter out VOR and ADF audio voice signals (VOICE knob must be out). VOICE - Push in to filter out VOR, DME and ADFaudiocode signals (RANGE knob must be out).
Amplifier Switch AMP 2 — Connects amplifier No. 2 to the audio system. AMP 1 — Connects amplifier No. 1 to the audio system.
NOTE For unfiltered reception of both audio code and voice signals, both knobs (RANGE and VOICE) must be either in or out.
HEADSET JACK
PUSH-TO-TALK SWITCH BOOM MICROPHONE JACK
PENDANT SWITCH JACK
NOTE: Push-to-talk switch or pendant switch will key either boom m i c r o p h o n e or o x y g e n mask microphone.
05-30-06
Sep
JL 1/89
