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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FLIGHT MANAGEMENT COMPUTER SYSTEM - ADJUSTMENT/TEST
___________________________________________________
1. General_______
A. Three tasks are given in this procedure. The first task is the Flight Management Computer (FMC) Ground Test, the second task is the FMC Servo Loop Ground Test and the third task is the System Test.
B. The FMCS has two Flight Management Computers (FMCs) and three Control Display Units (CDUs).
C. The CDUs are the communication links between the crew and the FMCS. An alpha-numeric keyboard is used to put in data and the Line-Select Keys (LSKs) move the data into the FMCS. The CDU has twelve LSKs. There are six LSK on each side of the CDU. These keys are identified as 1L thru 6L and 1R thru 6R. The 6L LSK refers to the sixth key down from the top left hand side of the CDU.
D. The initial entry of data through the CDU keyboard shows in the scratchpad field of the CDU's CRT. The scratchpad will also show alert and advisory messages. The LSKs are used to put the data into the applicable blocks.
E. Push a LSK when the scratchpad is empty to move data into the scratchpad.
TASK 34-61-00-745-222
2. Ground Test - Flight Management Computers_________________________________________
A. General
(1) This procedure contains instructions to do the FMC ground test for the left and the right FMC. This test make sure that the FMC operates correctly.
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 32-09-02/201, Air/Ground Relay System
(3)
AMM 34-21-00/201, Inertial Reference System
(4)
AMM 71-00-00/201, Power Plant
C. Access
(1) Location Zone
221 Control Cabin, RH
222 Control Cabin, LH
D. Prepare for the Test
S 865-244
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-245
(2)
Make sure the IRUs are aligned and in the NAV mode
(AMM 34-21-00/201).
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34-61-00
ALL ú ú 01 Page 501 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(3) S 865-246Make sure the airplane is not in the air mode (AMM 32-09-02/201).
(4) S 865-247Make sure the engines are off (AMM 71-00-00/201).
(5) S 865-248Set the EEC maintenance switches, on the P461 pilot's overhead maintenance panel, to the TEST position.
S 865-270
CAUTION: WHEN YOU PUT THE EEC MAINT POWER SWITCHES TO THE TEST POSITION,
_______ YOU MUST KEEP IT IN THE TEST POSITION FOR TWO MINUTES. THE EEC SYSTEM TAKES A MINIMUM OF TWO MINUTES TO COMPLETE ITS' POWER UP TESTS. IF YOU DO NOT KEEP THE SWITCHES IN THE TEST POSITION FOR TWO MINUTES , NUISANCE MESSAGES WILL OCCUR.
(6)
Stop for a minimum of two minutes before you continue this procedure.
S 865-250
(7)
Prepare the FMC for the test:
(a) Set the FMC master switch, on the P2 pilot's center instrument panel, to the applicable position (L or R).
NOTE: To do the left FMC tests the FMC master switch must be
____ in the L position. To do the right FMC tests the FMC master switch must be in the R position.
(b) Set the captain's NAV source select switch, on the P1 captain's instrument panel, to the applicable position (FMC L or FMC R).
NOTE: To do the left FMC tests the captain's NAV source select
____ switch must be in the FMC L position. To do the right FMC tests the captain's NAV source select switch must be in the FMC R position.
(c) Set the first officer's NAV source select switch, on the P3 first officer's instrument panel, to the applicable position (FMC L or FMC R).
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