757 AMM 飞机维护手册 飞行操纵 FLIGHT CONTROLS 3(45)

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 airspeed indicator is open to ambient pressure.
 (c)  Move the horizontal stabilizer until Dimension B on the
 stabilizer ballscrew actuator is 20.02 | 0.02 inches
 (508.5 | 0.5 mm).
 (d)  Push the captain's control column forward until the left
 elevator moves down 1.45 | 0.05 inches (36.8 | 1.3 mm).
 (e)  Measure and write down the control column force.
 (f)  Pull the captain's control column aft until the left elevator
 moves up 1.45 | 0.05 inches (36.8 | 1.3 mm).
 (g)  Measure and write down the control column force.
 (h)  Make sure that the sum of the above two forces is 67 to 83
 pounds (298 to 369 newtons).
 (i)  Pressurize the center hydraulic system (AMM 29-11-00/201).
 (j)  Remove the pressure from the right hydraulic system
 (AMM 29-11-00/201).
 (k)  Pressurize auxiliary pitot system No. 2 (lower left) to between
 2.40 and 2.50 psig (16.56 and 17.24 kPa) (311 to 317 knots)
 (AMM 34-11-00/201).
 (l)  Remove the pressure from auxiliary pitot system No. 1
 (AMM 34-11-00/201).
 (m)  Push the captain's control column forward until the left
 elevator moves down 1.45 | 0.05 inches (36.8 | 1.3 mm).
 (n)  Measure and write down the control column force.
 (o)  Pull the captain's control column aft until the left elevator
 moves up 1.45 | 0.05 inches (36.8 | 1.3 mm).
 (p)  Measure and write down the control column force.
 (q)  Make sure that the sum of the above two forces is 67 to 83
 pounds (298 to 369 newtons).

 S 865-144
 (10) Keep the left and center hydraulic systems pressurized for the neutral shift test.
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 27-31-00
 ALL  ú ú 10 Page 580M ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 865-145
 (11)
 Keep auxiliary pitot system No. 2 pressurized for the neutral shift test.

 N.
Neutral Shift Test

 S 865-326
 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.
 (1)  
Pressurize the right hydraulic system (AMM 29-11-00/201).

 S 215-147

 (2)  
Make sure that the left and center hydraulic systems are pressurized (AMM 29-11-00/201).

 S 865-148

 (3)  
Move the horizontal stabilizer until Dimension B on the stabilizer ballscrew actuator is 15.89 | 0.01 inches

 (403.6 | 0.3 mm) (Fig. 502).
 S 865-149
 CAUTION: DO NOT LET THE PRESSURE GO ABOVE 4.75 PSI (32.8 KPA)
_______ (426 KNOTS). THIS WILL PREVENT DAMAGE TO THE FEEL COMPUTER. MAKE PRESSURE CHANGES SUCH THAT THE INDICATED RATE OF CLIMB (OR DESCENT) IS LESS THAN 5000 FEET PER MINUTE FOR THE STATIC SYSTEM AND 300 KNOTS PER MINUTE FOR THE PITOT SYSTEM.
 (4) Pressurize auxiliary pitot systems No. 1 and 2 to between 3.45 and
 3.55 psig (23.79 and 24.48 kPa) (369 to 374 knots) (AMM 34-11-00/201).
 NOTE: Use airspeed values only when the static pressure on the
____ airspeed indicator is open to ambient pressure.
 (a)  Measure and write down the distance from the upper surfaces of the left and right elevator trailing edges to the center of the locating holes in the index plates (Fig. 505).
 NOTE: Use this procedure to measure elevator position in the
____
 neutral shift test.

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 27-31-00
 ALL  ú ú 09 Page 580N ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 725-008
 (5)  
Do the steps that follow to make sure that the elevator neutral shift operates correctly:

 (a)
　
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