29-11-00
ALL ú ú 05 Page 655 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
(2) S 416-222Close the access panels, 434AL and 444AL, for the hydraulic bay in the aft strut (AMM 06-43-00/201).
(3) S 416-223Close the access door, 197KL, for the central hydraulic service center (AMM 06-41-00/201).
S 416-224
WARNING:_______USE THE PROCEDURE AMM 32-00-15 TO REMOVE THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(4)
Remove the door locks from the landing gear doors and close the doors (AMM 32-00-15/201).
S 866-225
(5)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 29-11-00-796-226
10. Hydraulic System Elevator and Rudder Power Control Actuators (PCA's) Internal_____________________________________________________________________________ Leakage Check (This Includes the Elevator and Rudder PCU Monitoring System)
____________________________________________________________________________
A. General
(1)
This procedure does an internal leakage check for the elevator and rudder PCAs. The leakage rate for the PCAs in each hydraulic system must not be more than the approved leakage rates which follow:
(a)
The difference between the seal and the null leakage for the rudder PCAs must not be more than 2.0 GPM.
(b)
The difference between the seal and the null leakage for the elevator PCAs must not be more than 1.0 GPM.
(2)
When you do trouble shooting, it is not necessary to do a check of all the systems. In the system with high leakage, feel for hot tubing or actuators and listen for fluid leakage. This method will isolate the defective components in a subsystem which has too much internal leakage. Use approved tools to find heat, vibration, or sound. Before you do an internal leakage check, operate the components to make sure persons will not be injured or equipment will not be damaged when the component moves.
(3)
There are two techniques to measure flow rates; the multimeter technique and the flowmeter technique.
(a) Multimeter Technique
1) The multimeter technique uses the ACMPs to measure the hydraulic flow rate.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-00
ALL ú ú 05 Page 656 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(130)
