Elevator Trim Tabs; Elevator Trim Tab Removal; Elevator Trim Tab Rigging - Thrush Aircraft S2R–T660 Maintenance Manual

C. Set the elevator at the full UP travel of 27 (±1) degrees and adjust the aft stop on the control stick to
match this position.
D. Tighten the lock nut against the rod end bearing at the elevator horn.

ELEVATOR TRIM TABS

Controllable trim tabs, located on the inboard trailing edge of each elevator, are operated by an elevator trim
tab control lever located on the left side of the cockpit. Linkage between the elevator trim tab control lever
and the elevators consists of push rods, bellcranks and fairleads. The push rod leading from the trim tab
control lever to the trim tab assembly runs along the left side of the fuselage and is guided at intervals by
four fairleads. The aft end of this push rod attaches to a bellcrank. This bellcrank has arms at each end
permitting two short push rods to be routed back to bellcranks located on the inboard side of the horizontal
stabilizer. A short push rod leads from these bellcranks to horns on the trim tabs. (Fig. 7-13)

ELEVATOR TRIM TAB REMOVAL

A. Disconnect push rod from trim tab.
B. Remove rivets attaching trim tab hinge to elevator and remove trim tab.

ELEVATOR TRIM TAB RIGGING

A. Place the trim tab control lever in cockpit in the neutral position.
B. Adjust push rods to position both the aft fuselage and stabilizer bellcranks in a center
(neutral) position.
C. Place elevator in neutral position.
assemblies.
D. Tighten all bolts.
E. Loosen bolts attaching trim control lever stop and adjust the stop to provide proper trim tab travel.
The trim tab travel should be 8 (±1) degrees up and 22 (±1) degrees down.
F. Measure free-play of the tab at the trim tab horn attaching point. The total maximum free play
should not exceed 0.125-inch.
Effective: 12/17/04
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
Adjust the length of push rod, between the two bellcrank
When measuring trim tab travel, the elevator should be in the
neutral position.
*NOTE *
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