Electric Stabilizer Trim Actuator Installation 500
27-41-71Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/85
STABILIZER TRIM ELECTRIC ACTUATOR - ADJUSTMENT/TEST
1. Stabilizer Trim Electric Actuator Test
A. Test Stabilizer Trim Electric Actuator
(1)
Open stabilizer trim access door 3701.
(2)
Provide electrical power.
(3)
Check that stabilizer trim actuator and stabilizer trim control circuit breakers on panel P6 are closed.
(4)
Position left stabilizer trim switch momentarily to AIRPLANE NOSE DOWN and check that stabilizer leading edge moves up.
(5)
Position left stabilizer trim switch momentarily to AIRPLANE NOSE UP and check that stabilizer leading edge moves down.
(6)
Repeat (4) and (5) with right stabilizer trim switch to ensure correct direction of operation.
(7)
Operate stabilizer through one complete cycle from stabilizer NOSE UP to stabilizer NOSE DOWN.
CAUTION: DO NOT EXCEED ELECTRIC ACTUATOR DUTY CYCLE OF 2 MINUTES ON AND 13 MINUTES OFF.
(8)
Check that time required to operate system through full travel in either direction is 13 to 19 seconds. Check that operation is smooth and free from chatter.
(9)
Perform several consecutive actuations of approximately 3-second duration in stabilizer leading edge up and leading edge down. Check that operation is smooth and free from chatter.
(10)
Actuate in stabilizer NOSE UP direction until system comes up to full trim speed, then return trim switch to OFF position for approximately 0.2 seconds and actuate in opposite direction.
NOTE: Initial surges or chatter may be experienced due to cable stretch and mass of front end system.
(11)
Check that response in reverse direction is immediate.
(12)
Repeat steps (10) and (11) for stabilizer NOSE DOWN direction.
(13)
Close access door.
(14)
Remove electrical power, if no longer required.
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-41-71 Page 501
STABILIZER BALL NUT AND JACKSCREW GEARBOX - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Stabilizer Jackscrew Handling Equipment - F80014-16 (Preferred), or -1 (Optional)
B. Hoist capable of handling 150 pounds
C. Horizontal Stabilizer Lock Assembly - F80027-13
D. Adapter - 16/32-inch Spline, 3/4-inch Male Hex - F71252, or Pinion Gear Wrench Assembly -F71267
E. Spool or reel with capacity for 100 feet 1/8-inch cable
F. Grease - MIL-G-23827 (Ref 20-30-21)
G. Primer - BMS 10-11, Type I (Ref 20-30-41)
H. Oil - MIL-L-7870 (Ref 20-30-21)
I. Actuator Trammel Bar - F80055-1
J. Milliohmmeter -0 to 0.1 -ohm range
2. Prepare to Remove Gearbox
A. Position stabilizer leading edge to maximum down position.
B. On circuit breaker panel P6, open following circuit breakers:
(1)
Autopilot stabilizer trim servo
(2)
Stabilizer trim actuator
(3)
Stabilizer trim control
C. Open stabilizer trim access door 3701 and lower nose compartment access door 1103 (Ref Chapter 12).
3. Remove Stabilizer Trim Jackscrew Gearbox
A. Adjust forward mechanism aft support link adjusting nuts (Detail A, Fig. 402) to relieve tension of chain (14).
NOTE: Slack in chain is necessary to prevent excessive loads on chain when cable tension is relieved.
B. Release tension in cables by loosening turnbuckle (11) about 25 turns.
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