(3)  
If the results of the ground test are not satisfactory, refer to Fault Isolation Manual (FIM) for fault isolation procedures (FIM 32-42-00/101).

 (4)  
During the ground test, a time of 45 seconds without an input by the user will stop the test. The Control Display Unit (CDU) will then return to the GROUND TESTS menu. If this occurs, the ground test must be started again.

 (5)  
This test will reset the selected Brake Torque Limiting (BTL) sensor's zero offset to "0" if the sensor's zero offset is less than 5,000 ft-lbs. If all 16 brake torque limiting sensor's zero offset are not below 5,000 ft-lbs, "BRAKE LIMITER" EICAS message will display.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-42-00
 ALL  ú ú 06 Page 520 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 45-10-00/201, Central Maintenance Computer System

 C.
Access

 (1)  
Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH
 730 Wing Landing Gear - Left and Doors
 740 Wing Landing Gear - Right and Doors
 750 Body Landing Gear - Left and Doors
 760 Body Landing Gear - Right and Doors

 D.
Preconditions

 S 865-412
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical power is available (AMM 24-22-00/201).

 (b)  
The hydraulic systems are serviceable (AMM 29-11-00/201).

 (c)  
The Control Display Unit (CDU) is serviceable (AMM 34-61-00/501).

 E.
Prepare for the Test

 S 845-349
 (1)  
Make sure that the landing gear ground locks are installed
 (AMM 09-11-00/201).

 S 845-350

 (2)  
Make sure that the wheel chocks are installed.

 S 845-351

 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 845-352

 (4)  
Make sure that hydraulic systems No. 1, 2 and 4 are NOT pressurized (AMM 29-11-00/201).

 (5)  
Release the parking brake.

 S 845-354

 (6)  
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.

 S 845-353
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-42-00
 ALL  ú ú 07 Page 521 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 845-355
 (7)  
Prepare the CDU for the test:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU. 1) If <RETURN shows after you push the LSK, push the LSK that

 is adjacent to <RETURN until you see the CMC MENU.

 (c)  
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.

 (d)  
Push the NEXT PAGE key until you find <32 BRAKE CONTROL.

 (e)  
Push the LSK that is adjacent to <32 BRAKE CONTROL to show the GROUND TESTS menu for the brake control system.

 NOTE: If INHIBITED shows above <TORQ SENSOR ZERO, the test
____
 will not operate.

 (f)  If INHIBITED shows above <TORQ SENSOR ZERO: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
 test menu again.
 F. Torque Sensor Zero Function Ground Test
 S 745-356
 (1)  
Push the LSK that is adjacent to <TORQ SENSOR ZERO.
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 起落架 LANDING GEAR 7(18)