(p)
Pull stabilizer brake release handle and push control column from neutral in forward direction until quadrant stops are contacted. Stabilizer trim system should be operable in either direction.
(q)
Restore airplane to normal hydraulic configuration (Ref 27-31-0).
(11)
Close access door.
(12)
Remove electrical power, if no longer required.
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HORIZONTAL STABILIZER - REMOVAL/INSTALLATION
1. General
A. The horizontal stabilizer consists of two identical, but opposite, outboard sections connected by the stabilizer center section. This procedure may be used to perform the removal/installation for either left or right outboard stabilizer sections. A hoisting sling allows the horizontal stabilizer outboard sections to be removed or installed with or without the elevators and elevator tabs installed. However, certain parts of the elevator control system, located aft of the stabilizer outboard section rear spar, must be removed.
2. Equipment and Materials
A. Hoist - capable of lifting 700 pounds at a height of 20 feet
B. Support Stand - suitable for supporting stabilizer after removal
C. Horizontal Stabilizer Sling Assembly - F80006-51 or -67 (preferred), F80006-34 or -38 (optional), -2 cable assembly is used to remove or install stabilizer without the elevator attached and -51 cable assembly is used to remove or install stabilizer with the elevator attached.
D. Horizontal Stabilizer Trim Lock - F71336-501
E. Horizontal Stabilizer Pin Removal Tool - F80177-14 (Preferred) or F80177-1 (Optional)
F. Alignment and Guide Pins - F80255-10 (Preferred) or F80255-1 (Optional)
G. Grease - BMS 3-24 (Ref 20-30-21)
H. Sealant - BMS 5-95 (Ref 20-30-11)
I. Horizontal Stabilizer Pin Removal Equipment C55005-11 (Preferred) or C55005-1 (Optional)
J. Corrosion Preventive Compound - BMS 3-27
K. Anti-Seize Compound - BMS 3-28
3. Prepare for Removal of Horizontal Stabilizer
A. Remove elevator hydraulic systems A and B power (Ref 27-31-0 MP).
B. Position horizontal stabilizer, trim cutout switches to CUTOUT.
C. On circuit breaker panel P6, open following circuit breakers:
(1)
Autopilot stabilizer trim servo
(2)
Stabilizer trim actuator
D. Set horizontal stabilizer at zero degrees (3 units of trim) using stabilizer trim wheel on control stand.
E. Install horizontal stabilizer trim lock assembly on stabilizer trim wheel as follows (Fig. 404):
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(1)
Ensure that horizontal stabilizer is positioned per step 3.D.
(2)
Rotate trim wheel the. shortest route to place handle at top of wheel.
(3)
Adjust height of trim lock to position trim wheel handle snugly in bottom of yoke.
(4)
Insert pin through yoke and install safety pin.
F. Remove tail cone access panels 3801, 3802, and elevator control pushrod bolt access plate in tail cone. Remove outboard stabilizer section front and rear spar gap covers (upper and lower, Ref Chapter 12).
NOTE: The rear spar gap cover forms the aft stabilizer-to-body sliding seal.
G. If different stabilizer is to be installed, remove stabilizer-to-body seals and all remaining gap covers (Fig. 405).
H. Remove upper and lower trailing edge bracket assemblies and inspar No. 5 bracket assembly in outboard stabilizer section rear spar gap cover area. (Fig. 403, Detail B).
I. Disengage the forward stabilizer-to-body sliding seal (Fig. 403, Detail A), at the stabilizer front spar as follows:
(1)
Disconnect pin at link-to-pedestal assembly (four places).
(2)
Slide upper and lower seal plate assembly to extreme positions.
4. Remove Horizontal Stabilizer
A. Disconnect elevator tab hydraulic line located aft of stabilizer rear spar (Fig. 403, Detail B).
CAUTION: WHEN DISCONNECTING HYDRAULIC PRESSURE LINE, RELEASE CONNECTION SLOWLY AND ALLOW SYSTEM PRESSURE TO DROP BEFORE COMPLETELY REMOVING LINE. BE PREPARED TO CATCH SPILLED HYDRAULIC FLUID.
B. Disconnect elevator control pushrod from elevator (Fig. 402).
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