27-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
5) Do the Elevator Pressure Bypass Valve Test again until the trailing edge of the elevator is at a minimum of 0.5 inch (13 mm) above the neutral position mark.
S 865-278
(5)
Remove the pressure from the left, right and center hydraulic system.
S 485-279
(6)
Remove the pogo tools from the PCU pogos.
T.
Elevator Pressure Bypass Valve Test (Procedure 2) (Fig. 509A)
NOTE: Procedure 1 uses the pogo compression/extension tool.
____ Procedure 2 uses the tee and pressure gage. You can use procedure 1 or procedure 2 to test the elevator pressure bypass valve.
S 865-285
(1)
Make sure pressure is removed from the left, right and center hydraulic systems (AMM 29-11-00/201).
S 495-286
(2)
Do the steps that follow to install the tee fitting and the pressure gage in the hydraulic line.
NOTE: When you disconnect the hydraulic lines, use a bucket to
____
catch the hydraulic fluid that spills.
(a)
Find the titanium pressure line at the pressure reducer bypass valve.
(b)
Find the location where the titanium pressure line joins the flexible line.
(c)
Install the pressure gage between the titanium line and the flexible line.
(3)
Supply electrical power (AMM 24-22-00/201).
S 865-320
(4)
Make sure that these circuit breakers on the overhead panel, P11, are closed:
(a)
11C12, STAB TRIM SHUTOFF LEFT
(b)
11C13, STAB TRIM SHUTOFF RIGHT
S 865-319
S 865-287
(5) Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the P10 panel to the CUTOUT position.
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27-31-00
ALL ú ú 11 Page 582C ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 865-321
(6)
Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags:
(a)
11B19 or 11A19, STAB TRIM ALT (IF INSTALLED)
(b)
11C12, STAB TRIM SHUTOFF LEFT
(c)
11C13, STAB TRIM SHUTOFF RIGHT
(d)
11H11 or 11C05, STAB TRIM CONT L
S 865-288
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(7)
Pressurize the left and right hydraulic systems to 2900 - 3200 psi (20,000 - 22,060 kPa) (AMM 29-11-00/201).
S 865-289
(8)
Do these steps to remove the air from the elevator control system.
NOTE: The elevator control cables which are above the
____
stabilizer will move.
(a)
Move the elevator to the full airplane nose up position.
(b)
Move the elevator to the full airplane nose down position.
(c)
Do these steps 10 times.
S 865-290
(9)
Make sure that the pressure gage shows less than 2350 psi (16,200 kPa).
S 865-291
(10)
Remove the pressure from the right hydraulic system (AMM 29-11-00/201).
S 865-292
(11)
Make sure that the pressure gage shows between 2900 - 3200 psi (20,000 - 22,060 kPa).
S 865-317
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
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