H28659
Elevator Solenoid Valve Installation 500
22-11-31Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/67
ELEVATOR SOLENOID VALVE -ADJUSTMENT/TEST
EFFECTIVITY
GJ ALL EXCEPT B-2509 and B-2510
1. Elevator Solenoid Valve Test
A. General
(1) This test ensures that the elevator solenoid valve operates properly and assumes that the rest of the autopilot is operating normally.
B. Prepare to Test Elevator Solenoid Valve
(1)
Pressurize hydraulic system B (Ref 29-12-0, Hydraulic System B - Maintenance Practices).
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)
Assure that all autopilot and associated circuit breakers are closed.
C. Test Elevator Solenoid Valve
(1)
Engage autopilot.
(2)
Push, then pull, then center control column. Note increase in pressure required to move control column and check that elevator moves down, then up and returns to center with control column. Observe that autopilot does not disengage.
(3)
Disengage autopilot and check that control column/wheel moves easily with less pressure required than with autopilot engaged.
(4)
Remove electrical and hydraulic power if no longer required.
5C8
Jun 20/85 22-11-31 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ELEVATOR TRANSFER VALVE - REMOVAL/INSTALLATION
EFFECTIVITY
SD ST-AFK, ST-AFL GJ ALL EXCEPT B-2509 and B-2510
1. General
A. An elevator transfer valve is externally mounted on upper end of B elevator power unit and may be installed, but not used on A elevator power unit (Fig. 401).
2. Prepare to Remove Transfer Valve
A. Depressurize hydraulic systems A and B (Ref 29-11-0 and 29-12-0 MP).
WARNING: PRESSURIZING HYDRAULIC SYSTEMS WILL SUPPLY POWER TO RUDDER, AILERON, ELEVATOR, SPOILER AND SPEED BRAKE SYSTEMS. CARE SHOULD BE TAKEN TO ISOLATE OR TAG SYSTEMS NOT BEING TESTED TO PREVENT INJURY TO PERSONNEL OR DAMAGE TO AIRPLANE AND EQUIPMENT.
B. Remove access panel 3802 for both left and right elevator power units (Ref Chapter 12, Access Doors and Panels).
3. Remove Transfer Valve
A. Remove mounting bolts and lift valve and seal plate from power unit (Fig. 401).
B. Cover all openings.
4. Install Transfer Valve
A. Verify seal plate and O-rings are satisfactory or replace.
B. Lubricate O-rings with BMS 3-11 fluid and install valve and seal plate on power unit (Fig. 401).
C. Install mounting bolts and tighten to 40-50 pound-inches torque.
D. Lockwire bolts.
E. Pressurize hydraulic system B (Ref 29-12-0).
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.
F. Check for leakage and operation of valve (Ref Elevator Transfer Valve - Adjustment/Test).
G. Replace access panel.
Jun 20/85 22-11-41 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H29010
Elevator Transfer Valve Installation 500
22-11-41Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/67
