27-31-00
ALL ú ú 09 Page 580V ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 825-496
(10)
If any of the hardover checks fail, do the following steps:
(a)
Remove hydraulic power (AMM 29-11-00/201).
(b)
For elevator under deflection, add washers between the Clevis assembly and the Housing assembly on the elevator feel unit (AMM 27-31-17/201).
(c)
For elevator over deflection, remove washers between the clevis assembly and the housing assembly of the elevator feel unit (AMM 27-31-17/201).
(d)
After adding or removing washers, perform the steps over again that failed.
S 865-376
(11)
Move the POWER, ARM, and EXCITATION switches to OFF.
S 085-161
(12)
Disconnect the elevator hardover test box from airplane connector D2258 and from the upper, lower, and middle autopilot servo valve electrical connectors.
S 865-162
(13)
Connect the airplane wiring to the upper, lower and middle autopilot servo valve electrical connectors.
S 415-163
(14)
Close access panels 311AL and 313AL (AMM 06-42-00/201).
S 865-164
(15)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11E17, L FLT CONT CMPTR PWR
(b)
11E18, L FLT CONT CMPTR SERVO
(c)
11E20, C FLT CONT CMPTR PWR
(d)
11E21, C FLT CONT CMPTR SERVO
(e)
11E35, R FLT CONT CMPTR PWR
(f)
11E36, R FLT CONT CMPTR SERVO
(16)
Remove hydraulic power, if it is not necessary (AMM 29-11-00/201).
S 745-387
(17)
Do the MCDP Ground Test 08-SERVO ELEV (AMM 22-00-02/201, Autoflight BITE).
Q.
Elevator Pressure Reducer Operation Test
S 865-388
S 215-166
(1) Make sure that the L, R, and C FLT CONTROL SHUTOFF valve switches on the P61 panel are at the ON position.
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27-31-00
ALL ú ú 10 Page 580W ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 757 MAINTENANCE MANUAL
S 865-167
(2) Pressurize the left, right, and center hydraulic systems (AMM 29-11-00/201).
S 865-168
(3) Do the EICAS status/maintenance message erase procedure (FIM 31-41-00/101, Fig. 109).
S 215-169
(4) Make sure that the ELEV L HYD PRESS message is not shown on the EICAS display.
S 725-014
(5) Do the steps that follow to make sure the elevator pressure reducer operates correctly: (a) Put the L FLT CONTROL SHUTOFF valve switch on the P61 panel to the OFF position. (b) Make sure that the ELEV L HYD PRESS message is shown on the EICAS display, and the ELEV C HYD PRESS message is not shown on the EICAS display. (c) Put the C FLT CONTROL SHUTOFF valve switch on the P61 panel to the OFF position. (d) Make sure that the ELEV C HYD PRESS message is shown on the EICAS display, and the ELEV R HYD PRESS message is not shown on the EICAS display. (e) Put the R FLT CONTROL SHUTOFF valve switch on the P61 panel to the OFF position. (f) Make sure that the ELEV (L, C and R) HYD PRESS messages are shown on the EICAS display. (g) Put the L, C, and R FLT CONTROL SHUTOFF valve switches on the P61 panel to the ON position. (h) Make sure that the ELEV (L, C, and R) HYD PRESS messages stay on the EICAS display.
S 865-170
(6) Remove the power from the left, center, and right hydraulic systems (AMM 29-11-00/201).
S 215-171
(7) Make sure that the ELEV (L, C, and R) HYD PRESS messages stay on the EICAS display.
S 865-172
(8) Pressurize the left, center, and right hydraulic systems (AMM 29-11-00/201).
S 865-173
(9) Do the EICAS status and maintenance message erase procedure (FIM 31-41-00/101, Fig. 109).
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