FWD
ACTUATOR STABILIZER TRIM BALLSCREW ACTUATOR
C
Stabilizer Compartment Components
Figure 502 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-48-00
ALL ú ú 02 Page 508 ú Jun 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 715-121
(9)
AIRPLANES WITH ALTERNATE STAB TRIM SWITCHES ON THE CONTROL STAND; do the steps that follow to make sure the position indicating system shows stabilizer movement correctly:
(a)
Move the alternate stab trim switches forward and hold.
1) Make sure the position indicators correctly follow the movement of the stabilizer until it stops (0.20 |0.25 units of trim).
(b)
Release the alternate stab trim switches.
1) Make sure the alternate stab trim switches go to the neutral position when you release them.
(c)
Move the alternate stab trim switches aft and hold.
1) Make sure the position indicators correctly follow the movement of the stabilizer until it stops (15.3 |.25 units of trim).
(d)
Release the alternate stab trim switches.
1) Make sure the alternate stab trim switches go to the neutral position when you release them.
S 865-015
(10)
Open these circuit breakers on the P11 panel:
(a)
11H10, STAB TRIM POS IND LEFT
or STAB TRIM LEFT POS IND
(b)
11H19, STAB TRIM POS IND RIGHT
S 215-016
(11)
Make sure that an OFF indication is shown at the bottom of the stabilizer trim position indicator.
S 865-017
(12)
Close these circuit breakers on the P11 panel:
(a)
11H10, STAB TRIM POS IND LEFT
or STAB TRIM LEFT POS IND
(b)
11H19, STAB TRIM POS IND RIGHT
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27-48-00
ALL ú ú 02 Page 509 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 215-114
(13)
Make sure that the indicating tape is in view on the stabilizer trim position indicators.
S 865-019
(14)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 27-48-00-715-143
3. Stabilizer Takeoff Warning System - Operational Test____________________________________________________
A. General
(1)
No ground support equipment is necessary to do the operational test for the stabilizer takeoff warning system.
B.
References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 29-11-00/201, Main (Left, Right, Center) Hydraulic Systems
C.
Access
(1)
Location Zone
211/212 Control Cabin
D.
Stabilizer Takeoff Warning Test (Fig. 501)
S 865-020
(1)
Supply electrical power (AMM 24-22-00/201).
S 215-021
(2)
Make sure these circuit breakers on the P11 panel are closed:
(a)
11B19, STAB TRIM ALT (IF INSTALLED)
(b)
11C12, STAB TRIM SHUTOFF LEFT
(c)
11C13, STAB TRIM SHUTOFF RIGHT
S 215-022
(3) Make sure that the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the P10 panel are in NORM.
S 865-023
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SUREFACES
_______ 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.
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