757
MAINTENANCE MANUAL
S 866-098
(15) Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:
(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 866-099
(16)
Turn the pilot's control wheel to the fully right position.
S 976-100
(17)
Measure the leakage and write the value here:
Center _______________ GPM (Value No. 5)
S 976-101
(18) Subtract Value No. 5 from Value No. 2 and write the value here:
Center Value No. 2
minus Value No. 5 = _______ GPM (Value No. 6)
S 976-102
(19)
If Value No. 6 is less than -1.0 GPM, usually you must replace an aileron PCA because of high seal leakage.
S 976-103
(20)
If Value No. 6 is more than 1.0 GPM, usually you must replace an aileron PCA because of high null leakage.
S 976-104
(21)
If Value No. 6 is between the above limits, 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.
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29-11-00
ALL ú ú 06 Page 633 ú Dec 20/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 976-105
(22) Subtract Value No. 2 from Value No. 1 and write the value, which is the empennage flight control null leakage, here:
Center Value No. 1
minus Value No. 2 = _______ GPM (Value No. 7)
S 976-106
(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 976-107
(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 866-108
(25)
Move the C FLT CONTROL SHUTOFF switch on the P61 panel to ON.
S 866-109
(26)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel.
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