(8)
The procedures for the system gross internal leakage check and for component leakage check follow. This procedure does a leakage check of one hydraulic system at a time. The sequence in which you do a test of the left, center and right hydraulic systems is not important. When you start the leak check of a system, do not stop until you complete the procedure, to get correct results. In this procedure, all controls must be in the neutral position unless a different position is specified. After you make a test configuration for each test step, do not measure the leakage for at least 15 seconds. This will let the leakage flow become stable before you measure the flow.
(9)
The test procedure is in the paragraphs and figures which follow. Each figure is identified with the system and subsystem on which the test is done. The procedure is written in short steps. Make a mark on the figure next to each step when you do the step. There is space on each figure to write the flow, and the null and seal leakage. There is also space on each figure to calculate the leakage rates. A Corrective Action/Defective Component/Comment column tells how to correct a failure or isolate a defective component and tells more about the test step.
(10)
A data summary sheet is at the end of each hydraulic system test procedure to help identify which PCAs to replace.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
B. Equipment
(1) Use this equipment with the multimeter technique:
(a)
Digital Multimeter - John Fluke Model 27 YEL.
(b)
Clamp-on AC Current Probe - John Fluke Model 80i 600.
NOTE: The ac current probe is used with the multimeter.
____
(2) Use this equipment with the flowmeter technique (optional to the multimeter technique):
(a)
Flowmeter - Commercially Available, 0.2 to
7.0 GPM range with a precision of |3 percent of the indication, specified for operation at 3000 psi
(b)
Hydraulic Service Cart(s) - Commercially
Available, which can supply 6 GPM to each
system (18 GPM total) at 3000 psi
NOTE: The service cart is not necessary
____ if you use the ACMP to pressurize the hydraulic system.
(3)
Control Wheel Protractor Kit, A27021-29
(4)
Control Wheel Adapter Equipment, A27021-97
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