777 AIRCRAFT MAINTENANCE MANUAL
SATCOM SYSTEM -BITE
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SATCOM SYSTEM -SYSTEM TESTS
General
Use a maintenance access terminal to do the SATCOM system tests. To do a complete system test, you also need to make a call.
SATCOM System Test
The test does a check of the SATCOM system equipment and the data bus inputs to the system. The test takes between 2 and 5 minutes to complete. To run the test, select CONTINUE.
WARNING: MAKE SURE PERSONS STAY A MINIMUM OF 10 FEET AWAY FROM THE SIDE-MOUNTED HIGH GAIN ANTENNAS DURING THE INSTALLATION TEST. MAKE SURE THE PASSENGER ENTRY DOORS NEAR THE ANTENNAS ARE CLOSED. RF ENERGY CAN CAUSE INJURIES TO PERSONS.
NOTE: All SATCOM communications stop during this test. If SATCOM communications are in progress, they are disconnected when you do this test.
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SATCOM SYSTEM -SYSTEM TESTS
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777 AIRCRAFT MAINTENANCE MANUAL
SATCOM SYSTEM -INTERFACE DIAGRAM
Interface Diagram
This interface diagram is for reference purposes.
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777 AIRCRAFT MAINTENANCE MANUAL
SATCOM SYSTEM -INTERFACE DIAGRAM
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
SELCAL -INTRODUCTION
Purpose
The selective calling (SELCAL) system tells the flight crew that there is a call from a ground station on a communication transceiver. Because the SELCAL system monitors all incoming signals, the flight crew does not need to continuously monitor the radio channels.
Abbreviations and Acronyms
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ACP -audio control panel
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AIMS -airplane information management system
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AMU -audio management unit
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COMM -communication
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HF -high frequency
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mic -microphone
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PDF -primary display function
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PTT -push to talk
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SELCAL -selective calling
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VHF -very high frequency
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WEU -warning electronic unit
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WES -warning electronic system
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SELCAL -INTRODUCTION
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SELCAL -GENERAL DESCRIPTION
General
Each airplane has a different SELCAL code. A ground station transmits this code with a signal to contact an airplane. When the airplane receives its SELCAL code, several flight deck indications come on to alert the flight crew.
HF and VHF Transceivers
The communication transceivers send received audio to the SELCAL decoder.
SELCAL Decoder
A SELCAL coding switch connects to the SELCAL decoder and gives each airplane its SELCAL code.
The SELCAL decoder monitors for audio tones. If the tones are the same as the code, the decoder sends a signal to the audio management unit.
Indications
The audio management unit (AMU) sends a signal to the AIMS cabinets. The AIMS primary display function (PDF) then makes a COMM medium message, SELCAL. The AIMS cabinets also send a chime request to the warning electronic units (WEUs). The WEUs make a chime signal and send it to the aural warning speakers.
The AMU also sends a signal to the audio control panels (ACPs). The ACPs turn on the call light for the transceiver that received the SELCAL code.
To reset the indications, push the CALL light on the audio control panel or push the mic switch for the related radio.
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