(4)
A white FT annunciation will be displayed on the PFD in the marker beacon display position during the test.
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MAINTENANCE MANUAL
C. Control
(1)
Prior to operating the marker beacon system, electrical power must be provided to the airplane (AMM 24-22-00/201).
(2)
Ensure that the flight interphone system is operational (AMM 23-51-00/501).
(3)
Ensure that the integrated display system is operational (AMM 31-61-00/501).
(4)
Close 7A9 NAV RADIO MKR VOR L circuit breaker on overhead circuit breaker panel P7.
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MAINTENANCE MANUAL
B621 LEFT VOR/MKR RECEIVER (E2-3)
Marker Beacon System Schematic Figure 2
L34850
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747-400 FAULT ISOLATION/MAINT MANUAL
MARKER BEACON SYSTEM
COMPONENT SHT 102 FIG. QTY ACCESS/AREA REFERENCE
CIRCUIT BREAKER -NAV RADIO MKR VOR L, C759 RECEIVER - L VOR/MKR, B621 UNIT - (REF 31-61-00, FIG. 101) C EFIS/EICAS INTERFACE, M7352 L EFIS/EICAS INTERFACE, M7353 R EFIS/EICAS INTERFACE, M7351 UNIT - (REF 23-51-00, FIG. 101) AUDIO MANAGEMENT, B7438 ANTENNA - MARKER BEACON, B36 1 1 1 FLT COMPT, P7 117AL, MAIN EQUIP CTR, E2-3 139 KEEL BEAM 7A9 34-32-01 34-32-02 *
* SEE WDM EQUIPMENT LIST
Marker Beacon System - Component Index
Figure 101
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FAULT ISOLATION/MAINT MANUAL
LEFT VOR/MKR RECEIVER, B621
MAIN EQUIPMENT CENTER
MARKER BEACON ANTENNA, B36
FWD
Marker Beacon System - Component Location
Figure 102 (Sheet 1)
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H49161
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747-400
FAULT ISOLATION/MAINT MANUAL
TEST PUSHBUTTONS
LEFT VOR/MKR
RECEIVER, B621
Marker Beacon System - Component Location
Figure 102 (Sheet 2)
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747-400 MAINTENANCE MANUAL
MARKER BEACON SYSTEM - ADJUSTMENT/TEST
______________________________________
1. General_______
A. This subject has two tasks. The first task is an operational test of the marker beacon system. The operational test uses the central maintenance computer system to do a ground test of the left VOR/MB receiver. The operational test makes sure the operation of the marker beacon receiver and the system interface is correct.
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