THRUSH AIRCRAFT INC - MODEL S2R-G10
AIRPLANE MAINTENANCE MANUAL
flight testing.
SPEED LEVER RIGGING:
Ref. (Fig. 4-7)
a. Set the 21712-61 underspeed governor
actuator rod to midrange of available
threads and install the 21712-85 arm
on the serrated arm atop the under
speed governor input shaft.
* NOTE *
The serrated arm has 36 internal
splines to match the input shaft, and
may be indexed anywhere as
required by different airframe
manufacturers. The Thrush
requires this arm to be indexed with
the vertical peg at 50 degrees, plus
or minus 5 degrees, fwd of a line
that is 90 degrees to the engine
centerline with the under speed
governor on the minimum stop.
4-15
b. In the cockpit, set the speed lever
forward, pushing from full aft to a
position ¼ (.025”) inch short of
bottoming out in the slot.
c. Lock the speed lever in this position
with the friction knob.
d. On the engine, adjust the -79 assembly
and cable position thru the bracket on
the battery plate to allow the fwd end of
the -79 rod to line up with the hole in
the belcrank arm with the under speed
governor held on the maximum stop.
NOTE: The throttle must be fwd of
flight idle during this procedure, and the
under speed governor is spring loaded
to minimum. You’ll have to hold it in
the max position.
e. After connecting the -79 rod to the
belcrank, check lever operation from
the cockpit. There should be a
minimum of 1/8 inch cushion at the fwd
(high) end and no cushion at the aft
end. The speed lever should contact
the bottom (aft) of the slot, and the
21712-85 arm should have swung aft
to positively clear the vertical peg on
the serrated arm. The under speed
governor should be on the minimum
stop.
Reverse Power Rigging Check:
a. With the speed lever full aft and the
throttle somewhere forward of flight
idle, bring the throttle slowly into full
reverse. As the throttle stop latch pin
passes the ground idle stop, the engine
linkage (TPE331-10 Linkage) will pick
up the under speed governor and
advance it to full (Max) as the throttle
lever reaches full reverse. The peg on
the serrated arm will have swung
forward, well clear of the 21712-85
arm.
CAUTION
Install all cotter pins, check all
rod end witness holes and rod
connections, tighten all check
nuts and recheck all controls for
proper operation.
* NOTE *
The procedures listed above are
presented as a general guide.
There are numerous adjustments
available to be used. To achieve
desired results, variation from this
procedure is permitted. Any
available adjustments may be
utilized to achieve engine to cockpit
rigging, provide that no thread
witness holes are ported, that
cushion exists where required and
engine inputs move from stop to
stop
ENGINE RIGGING CHECKS AND
ADJUSTMENTS
This section deals only with those
performance checks and adjustments
peculiar to the Turbo Thrush aircraft.
Maintenance personnel must refer to the
current engine maintenance manual for the
Effective: 03/26/2010 Page
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