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747-400 MAINTENANCE MANUAL
(e)
Record the terrain database part number.
(f)
After you hear the terrain database part number, continue to push the self-test switch until you hear the PRESS TO CONTINUE annunciation.
NOTE: After the PRESS TO CONTINUE annunciates, the level 3
____ self-test is complete. If you do not push the self-test switch again, the self-test sequence will stop.
(g) If your airline maintains a terrain database version requirement, make sure the terrain database version is correct. 1) If the terrain database version is not correct, then do
this task: Load the Terrain Database (AMM 34-46-00/201).
S 862-029
(7)
Remove the headphone from the headphone jack on the GPWC.
(8)
Close the door on the front panel of the GPWC.
S 862-030
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747-400 MAINTENANCE MANUAL
GROUND PROXIMITY WARNING SYSTEM - ADJUSTMENT/TEST
_________________________________________________
1. General_______
A. This procedure has these tasks:
(1)
An operational test of the ground proximity warning system (GPWS)
(2)
A system test of the GPWS.
B. The operational test uses BITE to do a fast check for correct operation. Test equipment or special procedures are not necessary.
C. The system test uses the maintenance label (hex code) to do a complete check of the GPWS.
(1) The system test uses GPS data. The airplane must be moved to a position where the GPS antennas have a clear view of the GPS satellites.
D. To do this test, these systems must operate correctly:
(1)
MAWEA
(2)
Integrated Display System
(3)
Proximity Switch Electronic Unit
(4)
Inertial Reference System
(5)
Weather Radar System
(6)
Global Positioning System
(7)
Air Data System
(8)
ILS Navigation System
(9)
Radio Altimeter System
(10)
Flight Management Computer System
(11)
Central Maintenance Computer System
TASK 34-46-00-715-001
2. Operational Test - GPWS_______________________
A. General
(1)
The operational test is the self-test mode of the Ground Proximity Warning Computer (GPWC).
(2)
The operational test of the GPWS makes sure that the computer (GPWC), the module, and the interfaces to other systems operate correctly.
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 31-61-00/501, Integrated Display System
(3)
AMM 34-21-00/501, Inertial Reference System
(4)
AMM 45-10-00/201, Central Maintenance Computer System
C. Access
(1) Location Zone
222 Control Cabin RH
D. Prepare for the Test
S 865-002
(1) Supply electrical power (AMM 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
S 865-003
(2)
Make sure the left IRU is initialized and aligned
(AMM 34-21-00/501).
S 865-004
(3)
Make sure this circuit breaker is closed:
(a) P7 Overhead Circuit Breaker Panel
1) 7D9 GND PROX WARN
S 865-005
(4) Open this circuit breaker and install a DO-NOT-CLOSE tag:
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