Balance Cable Rigging; Elevators; Elevator Balance Spring - Thrush Aircraft S2R–T660 Maintenance Manual

Rerigging should not be necessary as long as no rods have
to be changed. However, a test of the unit's operation should
be carried out.
BALANCE CABLE RIGGING (Fig. 7-11)
The Thrush incorporates a rudder-aileron balance cable/spring system. The cables are attached to the
rudder pedals and routed out of the cockpit and to the spring which is attached to the opposite aileron
bellcrank. Adjustments are accomplished with the turnbuckles located on each cable. The forward pulley
retaining bracket should be located on the tube 62.37 fuselage station at L/H 6 1/4 ±1 R/H 5 ±1 inches up
The system is correctly adjusted when the rudder and ailerons simultaneously align in the neutral position.
Ensure there is no contact between balance springs.

ELEVATORS

Each elevator is attached to the rear spar of the horizontal stabilizer at three hinge points. The control stick
is connected to the elevators through the use of a bellcrank, idler, push tubes and
elevator horn. The right and left elevators are attached to a common elevator horn. (Fig. 7-12)

ELEVATOR BALANCE SPRING

The elevator system has a balance spring attached to the forward elevator bellcrank with a cable on top
and spring on the other end attached to bellcrank support bracket. The cable and spring are connected with
a turnbuckle for final adjustments. With the flaps up and the elevator in neutral and the forward stand
assembly is clamped on flap transfer tube at 48° from center on aft side (Figure 7-12, Delete). Rig the cable
to obtain a spring length of 39". The dual cockpit elevator balance spring is connected to the lower portion of
the forward elevator bellcrank and to the left lower longeron fuselage station 193.43 inches with a turnbuckle
for adjustment. With flaps up and elevator neutral, rig spring to 36 inches in length.
Effective: 12/17/04
THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL
*NOTE *
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