HORIZONTAL STABILIZER - DESCRIPTION AND OPERATION
1. General
A. The horizontal stabilizer assembly consists of left and right outboard sections attached to a center section truss located within the fuselage. The stabilizer is pivoted on two hinge joints attached to a bulkhead in the fuselage. The angle of attack is adjusted by means of an electrically driven or manually operated ball nut and jackscrew attached to the forward side of the center section truss (Ref Chapter 27, Stabilizer Trim System). An aerodynamic seal fills the gap between the stabilizer left and right outboard sections and the fuselage. A sliding plate seal is located at points where the front and rear spars pass into the fuselage. A leading edge is attached to the front spar. The trailing edge and elevator hinge structure is attached at the rear spar.
2. Stabilizer Structure
A. The front and rear spars, the ribs and the skin of the horizontal stabilizer outboard sections together with the center section truss form a beam which is the main structural member of the stabilizer. Attachment of the outboard sections and the center section is at the front and rear spars only, with no structural tie between the outboard section skin and the center section (Fig. 1 and 2). Refer to Chapter 55 of the Structural Repair Manual for skin identification.
B. The structure aft of the rear spar consists of ribs which incorporate hinge bearings for the elevator. The upper and lower surfaces of the area between the rear spar and the elevator hinge bearings are covered by skin panels attached to the ribs. Some of the skin panels are removable for maintenance purposes.
C. The gimbals surrounding the jackscrew ball nut are supported by a rigidly built-up framework of members on the forward face of the center section truss front spar.
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THRUST BRACE LINKS - REMOVAL/INSTALLATION
1. General
A. The thrust brace links are located at the rear spar of the horizontal stabilizer center section.
B. There are four thrust brace links, two on each side.
2. Prepare for Removal
A. We recommend to use suitable wood beams approximately 4-inch by 4-inch cross-section to support the center section at any approximately horizontal position (Fig. 402).
3. Procedure
A. Get access to the thrust brace links by using stabilizer trim access door.
4. Thrust Brace Links Removal
A. Disconnect the upper inboard end.
(1)
Remove the cotter pin (2) and nut (3).
(2)
Remove washer (4), bolt (7) and bushing (6).
(3)
Disconnect the thrust brace link (1) from the center section fitting.
B. Disconnect the lower inboard end.
(1)
Remove the cotter pin (14) and nut (15).
(2)
Remove washer (16), bolt (22) and bushing (21).
(3)
Disconnect the thrust brace link (27) from the center section fitting.
C. Disconnect the upper outboard end.
(1)
Remove the cotter pin (24) and nut (25).
(2)
Remove washer (26) and bolt (8).
(3)
Remove thrust brace link (1) from fitting (9).
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D. Disconnect the lower outboard end.
(1)
Remove the cotter pin (11) and nut (12).
(2)
Remove washer (13) and bolt (23).
(3)
Remove thrust brace link (27) from fitting (9).
5. Thrust Brace Links Installation
A. Connect the upper inboard end.
(1)
Install the thrust brace link (1) to the center section fitting.
(2)
Install bushing (6), bolt (7) and washer (4).
(3)
Install nut (3) and cotter pin (2).
B. Connect the lower inboard end.
(1)
Install the thrust brace link (27) to the center section fitting.
(2)
Install bushing (21), bolt (22) and washer (16).
(3)
Install nut (15) and cotter pin (14).
C. Connect the upper outboard end.
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