757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 1(103)

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 *[1]  The total leakage in each system must not be more than 100 drops in a minute or 0.10 gallon in a hour.
 *[2]  Each system must not have more than two leaks which are larger than the normal operation limits in Table 601. The airplane must not have more than four which are larger than the normal operation limits in Table 601. Total leakage for each system must not be more than 100 drops in a minute or 0.10 gallon in an hour.
 *[3]  Operate the pumps during the test. The ABEX alternating current motor pump (ACMP) leakage must not be larger than the Static Seal leakage in Table 601.
 ú*[4] Correct when possible.
 ú
 ú*[5] These leakage limits do not apply to landing gear brake assemblies.
 úRefer to AMM 32-41-10 for brake inspection details.

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 29-11-00
 ALL  ú ú 01.1 Page 618 ú Sep 28/02
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A
757 MAINTENANCE MANUAL
 TASK 29-11-00-796-036
 8.  Hydraulic System PCA Initial Leakage Check__________________________________________
 A.  General
 (1)  
This procedure quickly identifies the flight control system which has PCA's that possibly must be replaced in the Full Hydraulic System Internal Leakage Check procedure. This procedure quickly identifies PCA's with high leakage but it is not a replacement for the Full Hydraulic System Internal Leakage Check procedure. It does not do a check of the system check valves, the brakes and landing gear systems, the autopilot, or the secondary flight controls. This procedure also does not identify the one PCA which has high leakage.

 (2)  
The airplane must be in the cruise condition with the brakes and flaps/slats subsystems off. This procedure will find the spoiler, aileron, rudder, and elevator PCAs which have high leakage rates.

 (3)  
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.

 (4)  
Measure all leakage in the pressure side of the hydraulic systems while the system pressure is at approximately 3000 psi.

 (5)  
There are two techniques to measure flow rates; the multimeter technique and the flowmeter technique.
　
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