(a)
Pull the captain's control column until the elevator moves up
18.00 inches (457.2 mm).
(b)
Measure and write down the control column force at the finger reference point (Fig. 505).
(c)
Make sure that the force on the control column is between 100 and 135 pounds (445 and 601 newtons).
NOTE: Pull on the captain's and the first officer's
____ control columns at the same time and add the two applied forces.
(d)
Let the control column go to the neutral position.
(e)
Push the captain's control column forward until the elevators move down 12.00 inches (304.8 mm) (Fig. 505).
(f)
Measure and write down the control column force.
(g)
Make sure that the force is between 60 and 100 pounds (267 and 445 newtons).
(h)
Let the control column go to the neutral position.
S 865-271
(7)
Remove the pressure from the left, right, and center hydraulic systems (AMM 29-11-00/201).
S 865-272
(8)
Remove the pressure from auxiliary pitot systems No. 1 and 2 (AMM 34-11-00/201).
P.
Autopilot Hardover Test
NOTE: This test uses an elevator hardover test box that will send a signal to the applicable autopilot servo valve to move the elevator.
NOTE: The DIRECTION switch commands the appropriate autopilot servo
____ valve to move the elevator in the nose UP or the nose DOWN direction.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 10 Page 580Q ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 865-155
(1) Do the steps that follow to prepare for the autopilot hardover test:
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES
_______ WHEN HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STAILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(a)
Make sure that left, right, and center hydraulic system power is supplied (AMM 29-11-00/201).
(b)
Make sure that the left, right, and center hydraulic reservoirs are not pressurized (AMM 29-11-00/201).
(c)
Move the horizontal stabilizer until Dimension B on the stabilizer ballscrew actuator is 20.02 | 0.01 inches
(508.5 | 0.3 mm).
(d) Pressurize auxiliary pitot systems No. 1 and 2 to between 2.40 and 2.50 psig (16.55 and 17.24 kPa) (314 to 317 knots) (AMM 34-11-00/201).
NOTE: Use airspeed values only when the static pressure
____ on the airspeed indicator is open to ambient pressure.
(e)
Move the captain's control column full travel forward and aft to make sure it moves freely.
(f)
Put a piece of tape on the left side of the airplane adjacent to the elevator trailing edge.
(g)
Make a mark on the tape that shows the neutral elevator position.
(h)
Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags: 1) 11E17, L FLT CONT CMPTR PWR 2) 11E18, L FLT CONT CMPT SERVO 3) 11E20, C FLT CONT CMPTR PWR
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-31-00
ALL ú ú 10 Page 580R ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
4) 11E21, C FLT CONT CMPTR SERVO
5) 11E35, R FLT CONT CMPTR PWR
6) 11E36, R FLT CONT CMPTR SERVO
(i)
Open access panels 311AL and 313AL.
(j)
Disconnect the electrical connectors from the upper, lower, and middle autopilot servo valves.
(k)
Make sure that the POWER, EXCITATION, ARM, DIRECTION and ENGAGE switches are OFF.
(l)
Connect the elevator hardover test box to the airplane connector D2258 and to the upper, lower, and middle autopilot servo valve connectors one at a time.
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(47)
