EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-20
 ALL  ú ú 01 Page 214 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 (b)  
Remove the aft quadrant lockout tool.

 I.
Rudder PCA Adjustment and Test

 NOTE: This task contains the data that is necessary to adjust one PCA.
____ If you adjust more than one PCA, refer to 27-21-00 for the applicable Adjustment/Test procedure.
 Before you do the test, make sure the airplane is stable at ambient air temperature |10.0 degrees F (|5.5 degrees C) for at least one hour.
 S 492-044
 (1) Install rig pin R3 (for the feel, centering, and trim mechanism).
 S 032-045
 WARNING: DO NOT DISCONNECT THE THREE PCA INPUT RODS AT THE SAME TIME
_______ WITH HYDRAULIC POWER ON. THE RUDDER WILL MOVE TO ITS FULL LEFT POSITION AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Disconnect the input rod from the PCA you will adjust.
 S 862-076
 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.
 (3)  
Supply pressure to the left, right, and center hydraulic systems (Ref 29-11-00).

 S 862-046

 (4)  
Remove the power from the hydraulic system that supplies pressure to the PCA you will adjust (Ref 29-11-00) and do these steps:

 NOTE: The right system supplies the top PCA.
____
 The left system supplies the middle PCA.
 The center system supplies the bottom PCA.

 (a)  Move the applicable FLT CONTROL SHUTOFF switch (L, C, or R) on the right side panel, P61, to OFF. Attach a DO-NOT-OPERATE tag and make sure the amber switch position legend light comes ON.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-20
 ALL  ú ú 02 Page 215 ú Mar 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 (b)  Open the applicable circuit breaker below on the overhead panel, P11, and attach a DO-NOT-CLOSE tag: 1) 11H17, FLT CONT SHUTOFF TAIL LEFT 2) 11H18, FLT CONT SHUTOFF TAIL CTR 3) 11H28, FLT CONT SHUTOFF TAIL RIGHT
 (5)  S 972-048Keep a record of the rudder position.
 NOTE:____ This is the datum position and will be used to adjust the other PCA.
 (6)  S 862-047Remove the power from the other two hydraulic systems (Ref 29-11-00) and do these steps:
 NOTE:____ Make sure the power is removed from all three hydraulic systems.
 (a) (b)  Move the two remaining FLT CONTROL SHUTOFF switches on the P61 panel to OFF. Attach DO-NOT-OPERATE tags and make sure the amber switch position legend lights come ON.Make sure these circuit breakers on the P11 panel are open and have DO-NOT-CLOSE tags attached: 1) 11H17, FLT CONT SHUTOFF TAIL LEFT 2) 11H18, FLT CONT SHUTOFF TAIL CTR 3) 11H28, FLT CONT SHUTOFF TAIL RIGHT
 (7)  S 432-049Connect the input rod to the PCA you will adjust.
 (8)  S 032-050Disconnect the input rods from the other two PCAs.
 NOTE:____ Do not adjust the length of these input rods.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-21-20
 ALL  ú ú 01 Page 216 ú Jun 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 862-051
 (9)  Supply power to the hydraulic system that supplies pressure to the PCA you will adjust (Ref 29-11-00) and do these steps:
 NOTE: The right system supplies the top PCA.
____
 The left system supplies the middle PCA.
 The center system supplies the bottom PCA.

 (a)  
Remove the DO-NOT-OPERATE tag and move the applicable FLT CONTROL SHUTOFF switch (L, C, or R) on the P61 panel to ON.
　
中國航空網(wǎng) m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：757 AMM 飛機(jī)維護(hù)手冊 飛行操縱 FLIGHT CONTROLS 2(84)