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27-38-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
ELEVATOR POSITION TRANSMITTER - REMOVAL/INSTALLATION
____________________________________________________
1. General_______
A. This procedure contains steps to remove and install the position
transmitters for the elevator control system.
TASK 27-38-02-024-001
2. Remove the Position Transmitters________________________________
A. Equipment
(1)
Rig Pins from Set B20003-XX (Ref 20-10-24):
(a)
E/ST8 - B20003-21
(b)
E/ST9 - B20003-21
(2)
Gage Assembly - B27039-3 (Part of the Elevator
and Stabilizer Rigging Equipment, B27039-1)
B.
References
(1)
06-42-00/201, Empennage Access Doors and Panels
(2)
20-10-24/201, Rig Pins
(3)
24-22-00/201, Electrical Power - Control
(4)
27-61-00/201, Spoiler/Speedbrake Control System
(5)
29-11-00/201, Main (Left, Right, and Center) Hydraulic System
C.
Access
(1)
Location Zones 211/212 Control Cabin 311/312 Area Aft of Pressure Bulkhead to BS 1787.45 335/345 Horizontal Stabilizer, Rear Spar to Trailing Edge
(2)
Access Panels
311AL Forward Stabilizer Compartment
335BB/335DB Position Transmitter (Left)
345BB/345DB Position Transmitter (Right)
D.
Prepare for the Removal
S 864-002
(1) Supply electrical power (Ref 24-22-00).
S 864-003
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. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(2)
Pressurize the right and center hydraulic systems (Ref 29-11-00).
S 864-004
(3)
Move the horizontal stabilizer until Dimension B on the stabilizer ballscrew actuator is 15.89 | 0.01 inches
(40.36 +/- 0.025 centimters) (6 units of trim on the position indicator) (Fig. 401).
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A
757
MAINTENANCE MANUAL
STABILIZER BALLSCREW ACTUATOR
A
1 TO USE THE GAGE ASSEMBLY TO SET DIMENSION B TO
15.89 |0.01 INCHES, DO THE STEPS THAT FOLLOW:
1.
PUT THE GAGE ASSEMBLY AGAINST THE BALLSCREW
SO THAT THE BOLT HEADS ARE ON THE SHOULDERS
OF THE UPPER AND LOWER STOPS
2.
MAKE SURE THAT THE FEELER BLADE CAN BE PUT
BETWEEN THE BOLT HEAD OF THE GAGE ASSEMBLY AND
ON THE SHOULDER OF THE UPPER STOP
(THIS WILL PREVENT PRELOADING)
Measurement of Stabilizer Dimension B Figure 401
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27-38-02
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757 MAINTENANCE MANUAL
ELEVATOR POSITION
PREPARE THE MATING SURFACES WITH AN ABRASIVE PAD, THEN APPLY A LAYER OF ALODINE. APPLY SEALANT TO THE EDGES OF THE MATING SURFACES, THE SURFACE EDGES, AND THE ENDS OF THE FASTENERS.
A MAXIMUM OF 12 THREADS ARE PERMITTED TO BE SEEN ON THE ADJUSTING NUT.
SET THE CONTROL ROD TO THIS INITAL LENGTH WHILE THE ELEVATOR AND STABILIZER ARE IN THEIR ADJUSTMENT POSITIONS.
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