(i)  
Discard the O-ring.

 TASK 32-41-12-404-010
 3.  Hydraulic Brake Pressure Transmitter Installation (Fig. 401)_________________________________________________
 A.  General
 (1)  
In subsequent steps, the hydraulic brake pressure transmitter is referred to as the pressure transmitter.

 B.  
Special Tools and Equipment

 (1)  
Bonding Meter (AMM 20-22-01/601)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-12
 ALL  ú ú 01 Page 404 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C. Consumable Materials

 (1)  
G01158 Nitrogen, Gaseous (Dry, Commercial
 Grade, 99.9 percent pure).

 (2)  
If nitrogen is not available,
 Source of Clean Dry Air, maximum moisture
 content corresponding to an atmospheric dew
 point of -20 degrees F (-29 degrees C)

 (3)  
D00288 Lubricant - MCS 352

 NOTE:  Use BMS 3-11 or MCS 352 to lubricate
____
 O-rings and fittings on the accumulator
 assembly.

 (4)  D00196 Hydraulic Fluid - BMS 3-11
 NOTE:  Use BMS 3-11 or MCS 352 to lubricate
____
 O-rings and fittings on the accumulator
 assembly.

 D. References
 (1)  
AMM 20-22-01/601, Electrical Bonding

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

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

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
AIPC 32-41-11, Fig. 1

 (6)  
AIPC 32-41-12, Fig. 2

 (7)  
WDM 32-41-21

 E.
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right
 (Hydrualic Brake Pressure Transmitter)

 222  Control Cabin, RH (P6 Main Power Distribution Panel)
 F. Procedure
 S 424-013
 (1)  Install the reducer in the end of the pressure transmitter.
 NOTE:  Lubricate and install the O-ring with the reducer.
____
 S 424-014
 (2)  
Do the steps that follow to install the pressure transmitter:

 (a)  
Put the transmitter in its position on the mounting bracket and install the four screws and washers. 1) Clean the mating surfaces to make an electrical bond at one

 of the screw locations.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-12
 ALL  ú ú 01 Page 405 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 2)  Use a bonding meter to measure electrical resistance across the bond (AMM 20-22-01/601). a) Maximum resistance must not be more than +/- 0.0025
 ohms.
 (b)  
Lubricate the threads and fittings of the tube assembly.

 (c)  
Install the tube between the manifold and the pressure transmitter.

 (d)  
Tighten the tubing nuts.

 (e)  
Connect the electrical connector, DT409, to the pressure transmitter.

 S 864-016
 (3)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  
P6, Main Power Distribution Panel
 1) 6D23, BRAKE PRESS IND

 S 864-048
 (4)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker (if opened):

 (a)  
P415, Power Distribution Center, Right Panel
 1) 415R19, TOWING XFMR

 S 614-041
 (5)  
Do these steps to charge the hydraulic brake accumulator:

 (a)  
Attach a source of nitrogen or dry air to the stem of the gas charging valve.

 WARNING:_______DO NOT LOOSEN THE BODY OF THE GAS CHARGING VALVE. THE PRESSURE IN THE ACCUMULATOR CAN QUICKLY PUSH THE GAS CHARGING VALVE OFF THE MANIFOLD. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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 6(85)