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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
(2) S 865-274Use the stabilizer position indicator to move the horizontal stabilizer to 6 units of trim.
(3) S 865-275Use the Captain's control column to do the steps that follow: (a) Move the control column fully forward then fully aft, 5 times. (b) Release the control column. (c) Let the control column return to a centered position.
S 725-277
WARNING: BE CAREFUL WHEN YOU DO THE ELEVATOR PRESSURE BYPASS VALVE TEST.
_______ THE HYDRAULIC SYSTEM IS FULLY PRESSURIZED AND THE AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILZER CAN MOVE QUICKLY. MOVEMENT OF THESE CONTROL SURFACES CAN CAUSE DAMAGE TO EQUIPMENT OR INJURIES TO PERSONS.
(4)
Do the steps that follow to make sure the elevator pressure bypass valve operates correctly:
(a)
Put a 2 inch (50 mm) piece of tape on the side of the airplane adjacent to the left elevator trailing edge. Put the tape in the center and vertically along the length of the index plate.
(b)
Make a mark on the tape to show the neutral position of the left elevator.
(c)
Make a mark on the tape 0.5 inch (13 mm) above the neutral position mark.
(d)
Use the elevator pogo tools, B27032-9, to extend the pogos on the left inboard and the left outpoard PCU's to 0.25 +/- 0.01 inch (6.4 +/- 0.3 mm).
NOTE: Make sure you do not move the elevator input crank when
____ you extend or compress the pogos.
(e)
Make sure the trailing edge of the left elevator moves down.
(f)
Use the elevator pogo tool, B27032-9, to compress the pogo on the left middle PCU 0.25 | 0.01 inch (6.4 | 0.3 mm).
NOTE: The trailing edge of the elevator may move up but it
____ should not move above the neutral position mark.
(g) If the trailing edge of the elevator moves to or above the neutral position mark, do the steps that follow: 1) Make sure the elevator PCU pogos are positioned correctly. 2) If the elevator PCU pogos are correctly positioned, do
these steps:
a) Remove the pogo tools, B27032-9, from the pogos.
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(h)
(i)
(j)
757 MAINTENANCE MANUAL
b) With one hydraulic system pressurized at a time, move the elevator up and down to make sure each PCU will operate.
NOTE: The left hydraulic system supplies power to
____
the middle PCU.
The right hydraulic system supplies power to the outboard PCU.
The center hydraulic system supplies power to the inboard PCU.
c) Do the Hydraulic System Gross Internal Leakage Check (AMM 29-11-00/601).
3) Do the Elevator Pressure Bypass Valve Test again until the trailing edge of the elevator does not move above the neutral position mark.
Use the tail flight control shutoff valve to remove the pressure from the right hydraulic system.
NOTE: The trailing edge of the elevator will start to move
____ up quickly and then it will move slower at the end of its travel.
Make sure the trailing edge of the elevator is at a minimum of
0.5 inch (13 mm) above the neutral position mark.
Do the steps that follow if the elevator trailing edge is not a
minimum of 0.5 inch (13 mm) above the neutral position mark.
1) Make sure the left and center hydraulic systems are
pressurized. 2) Make sure the right hydraulic system is not pressurized. 3) Make sure the elevator PCU pogos are correctly positioned. 4) If it is necessary, replace the items that follow in the 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 3(53)
