Left Value No. 1
minus Value No. 2 = _______ GPM (Value No. 7)
S 976-078
(23)
If value No. 7 is more than 1 GPM, usually you must replace a rudder or elevator PCA because of high null leakage.
S 976-079
(24)
If Value No. 7 is less than 1 GPM, you can not make a decision about PCA replacement until you do the Full Hydraulic System Internal Leakage Check and Isolation of Components with High Leakage procedure.
S 866-080
(25)
Move the L FLT CONTROL SHUTOFF switch on the P61 panel to ON.
S 866-081
(26)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on P11 panel.
(a)
11C6, FLT CONT ELEC 1L AC
(b)
11C7, FLT CONT ELEC 1L DC
(c)
11C8, FLT CONT ELEC 2L AC
(d)
11C9, FLT CONT ELEC 2L DC
(e)
11G17, FLT CONT ELEC 1R AC
(f)
11G18, FLT CONT ELEC 1R DC
(g)
11G27, FLT CONT ELEC 2R AC
(h)
11G28, FLT CONT ELEC 2R DC
S 086-082
(27) Put the left hydraulic system back to its usual condition as follows:
(a) If you use the flowmeter technique, do these steps: 1) If you use an ACMP to pressurize system, do these steps: a) Put the L HYD PUMPS ELEC pump switch to the OFF position.
b) Remove the flowmeter from the ACMP pressure line and connect the ACMP pressure line.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
2) If you use the hydraulic service cart to pressurize the system, do these steps: a) Operate the hydraulic service cart to decrease the
system pressure to zero. b) Disconnect the service cart and install caps on the airplane ground power connections. 3) Close the access panel, 434AL, for the hydraulic bay in the aft strut (AMM 06-43-00/201).
(b) If you use the multimeter technique, do these steps: 1) Put the L HYD PUMPS ELEC pump switch to the OFF position.
WARNING: BE CAREFUL WHEN YOU REMOVE THE CLAMP-ON AC CURRENT
_______ PROBE FROM THE POWER PANEL. THE VOLTAGES IN THE POWER PANEL CAN KILL AND/OR CAUSE DAMAGE TO EQUIPMENT.
2) Remove the clamp-on ac current probe from the wire at the ACMP ELCU in the P32 panel.
G. Center System PCA leakage Check
S 486-083
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