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747-400 MAINTENANCE MANUAL
GLOBAL POSITIONING SYSTEM - ADJUSTMENT/TEST
___________________________________________
1. General
_______
A. This procedure has two tasks.
(1) This first task is an operational test of the Global Positioning System (GPS). The second task is a system test of the GPS.
NOTE: The airplane must be moved to a position where the GPS
____ antennas have a clear view of the GPS satellites.
TASK 34-58-00-715-001
2. Operational Test - Global Positioning System
____________________________________________
A. General
(1) This task does a GPS position check.
B. Reference
(1) AMM 24-22-00/201, Manual Control
C. Access
(1) Location Zones
221 Control Cabin, LH
222 Control Cabin, RH
D. Prepare for the Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-003
(2)
Make sure these circuit breakers are closed:
(a) On the overhead circuit breaker panel, P7: 1) 7A06 MMR L 2) 7B17 MMR R
E. Procedure
S 585-004
(1)
Move the airplane to a position where the GPS antennas have a clear view of the GPS satellites.
S 715-007
(2)
Make sure there are no GPS failure indications on the top EICAS display.
S 715-008
(3)
Do these steps to see the GPS position on an FMC CDU:
(a)
Push the INIT/REF key on one of the CDUs.
(b)
Push the line select key (LSK) that is adjacent to <INDEX.
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747-400 MAINTENANCE MANUAL
(c)
Push the LSK that is adjacent to <POS.
(d)
Push the PREV PAGE key on the CDU. 1) Make sure the GPS R position is shown on the line above <INDEX.
2) Make sure the GPS L position is shown on the line above the GPS R position.
NOTE: As much as 10 minutes of time can be necessary for
____ the positions to show on the CDU.
TASK 34-58-00-735-009
3. System Test - Global Positioning System
_______________________________________
A. General
(1) This task does a GPS interface check.
B. Reference
(1) AMM 24-22-00/201, Manual Control
C. Access
(1) Location Zones
221 Control Cabin, LH
222 Control Cabin, RH
D. Prepare for the Test
S 865-010
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-019
(2)
Make sure these circuit breakers are closed:
(a) On the overhead circuit breaker panel, P7: 1) 7A06 MMR L 2) 7B17 MMR R
E. Procedure
S 585-011
(1)
Move the airplane to a position where the GPS antennas have a clear view of the GPS satellites.
S 715-012
(2)
Make sure there are no GPS failure indications on the top EICAS display.
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747-400
MAINTENANCE MANUAL
S 715-016
(3) Do these steps to do a check of the IRS/GPS data busses:
(a)
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本文链接地址：747-400 AMM 飞机维护手册 导航 NAVIGATION 3(107)
