H19206
Rudder Transfer Valve Installation 545
22-11-71Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 01/74
RUDDER TRANSFER VALVE - ADJUSTMENT/TEST
EFFECTIVITY
SD ST-AFK, ST-AFL GJ ALL EXCEPT B-2509 and B-2510
1. Rudder Transfer Valve Test
A. General
(1) This test ensures that the transfer valve operates properly and assumes that the rest of the yaw damper system is operating normally.
B. Prepare to Test Rudder Transfer Valve
(1)
Pressurize hydraulic system B (Ref 29-12-0 MP).
WARNING: MAKE SURE ALL PERSONNEL AND OBSTRUCTIONS ARE CLEAR OF AILERON, ELEVATOR, OUTBOARD SPOILERS AND RUDDER SYSTEMS. SURFACES AND CONTROLS MAY MOVE ABRUPTLY WHEN HYDRAULIC POWER IS APPLIED.
(2)
Close appropriate circuit breakers.
C. Test Rudder Transfer Valve (Aircraft not incorporating SB 27A1206)
(1)
Place yaw damper engage switch to ON.
(2)
Move yaw damper test switch, located on center instrument panel, to the right. Observe yaw damper test meter needle moves to the right, then returns to center. Observe rudder moves approximately 2 degrees to the right, then returns to center.
CAUTION: DO NOT ACTUATE TEST SWITCH FOR MORE THAN 10 SECONDS.
(3)
Move yaw damper test switch to the left. Observe yaw damper test meter needle moves to the left, then returns to center. Observe rudder moves approximately 2 degrees to the left, then returns to center.
D. Test Rudder Transfer Valve (Aircraft incorporating SB 27A1206, Yaw Damper Coupler P/N 10-62253, 4084042)
(1) Perform Yaw Damper Coupler Installation Test (Ref 22-12-01/401).
May 01/00 22-11-71 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AUTOPILOT STABILIZER TRIM SERVO - REMOVAL/INSTALLATION
1. Remove Autopilot Stabilizer Trim Servo (See figure 401.)
A. Remove access panel 3701. Refer to Chapter 12, Access Doors and Panels.
B. Disconnect electrical connector and wire bundle clamp from autopilot trim servo.
C. Remove mounting bolts and remove trim servo.
2. Install Autopilot Stabilizer Trim Servo (See figure 401.)
A. Remove foreign matter from motor mounting pad.
B. Position autopilot trim servo on mounting pad and install mounting bolts.
C. Connect electrical connector to servo assembly.
D. Install access panel.
E. Check operation of stabilizer trim servo. Refer to Autopilot Stabilizer Trim Servo - Adjustment/ Test.
500
May 15/72 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 22-11-81 Page 401
H19210
Autopilot Stabilizer Trim Servo Installation 500
22-11-81 Figure 401 Jun 20/85
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AUTOPILOT STABILIZER TRIM SERVO - ADJUSTMENT/TEST
1. Autopilot Stabilizer Trim Servo Test
A. Prepare to Test Autopilot Stabilizer Trim Servo
(1)
Check that horizontal stabilizer and elevator are free to travel.
(2)
Provide electrical power and close autopilot and stabilizer trim circuit breakers on P6 panel.
(3)
Provide hydraulic systems A and B (Ref 29-11-0 and 29-12-0 MP) or hydraulic systems A, B, and standby (Ref 29-15-00 MP).
WARNING: MAKE SURE ALL PERSONNEL AND OBSTRUCTIONS ARE CLEAR OF AILERON, AND TAB SURFACES. SURFACES MAY MOVE ABRUPTLY WHEN HYDRAULIC POWER IS APPLIED.
(4)
Position the stabilizer to 5 units of trim. Position flaps full up.
B. Test Autopilot Stabilizer Trim Servo (SP-77)
(1)
Engage the autopilot ELEV engage switch, and pull control column out of detent. Observe elevator moves up.
(2)
Return the column to neutral. Observe the stabilizer leading edge moves down and trims at a rate of 1 unit in 30 to 40 seconds.
CAUTION: TO PREVENT STABILIZER TRIM MOTOR FROM BURNING OUT, DO NOT OPERATE MORE THAN ONE MINUTE IN EVERY 10 MINUTES.
(3)
Disengage autopilot (this terminates trimming action) and return stabilizer to 5 units of trim.
(4)
Extend flaps to 5 degrees. Engage the autopilot ELEV engage switch, and push the control column out of detent. Observe elevator moves down.
(5)
Return the column to neutral. Observe the stabilizer leading edge moves up and trims at a rate of 1 unit in 4 to 7 seconds.
(6)
Disengage autopilot.
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