THRUSH AIRCRAFT INC - MODEL S2R-G10
AIRPLANE MAINTENANCE MANUAL
full regime of performance checks required
for proper engine operation and continued
airworthiness of the aircraft.
GROUND IDLE ADJUSTMENTS:
Ref. (
Refer to Fig. 4-7)
a. Run engine to bring oil temperature
within normal operating range.
b. Set the power lever to the ground idle
position. Check engine tachometer for
the reading indicated in the flight
manual. If the tachometer indication is
not correct, proceed as follows:
1. Shut down the engine.
2. Remove the safety wire from the
minimum speed adjustment stop
screw, located on the under
speed governor.
3. Loosen the jam nut on the
adjustable screw. Using an Allen
wrench, turn the adjusting screw
clockwise to increase speed and
counterclockwise to decrease
speed. NOTE: 1 turn –
5.5%RPM.
4. Tighten jam nut and re-safety
when adjustment is complete.
4-16
Fill hopper and hold the control
stick full
aft (full up elevator)
during all high power ground
operations to keep aircraft from
nosing over.
EMERGENCY CUT OFF AND
PROPELL
ER FEATHER CHECK
This check is done with the power lever in
the ground idle position, the engine
running and the speed lever in the low
position. Ensure that the area ahead of
the aircraft is clear. With stick full aft and
brakes released, pull emergency cut off
lever full aft. The aircraft will surge forward
briefly, then settle as the engine
decelerates rapidly and the propeller
feathers immediately. Watch for an
immediate EGT decrease. If not, stop
engine immediately with the fuel on/off
switch. After check is completed, move
emergency cut off back to normal position.
Turn on the unfeathering pump to restore
prop on the start locks. The power lever
should be in mid-reverse position to put
prop on the start locks.
THE TORQUE SYSTEM
DESCRIPTION AND OPERATION
The direct reading torque gauge reads the
pressure at the torque sensor pressure
port of the engine by routing a hose from
the back of the gauge to the engine case.
CALIBRATION OF TORQUE
INDICATING SYSTEM
After engine overhaul, hot section
inspection or the completion of any
maintenance which may affect the torque
output of the engine, recalibrate the torque
pressure indicator per the new torque
pressure data recorded in the engine log
book.
Create a graph (Lebow plot) with gauge
pressure (PSIG) on the “x” (horizontal) axis
and percent torque on the “y” (vertical)
axis. Draw a line from zero torque and
zero pressure up to 100% torque and the
PSIG at 100% torque from the engine log
book. See example below.
CAUTION
Page Effective: 03/26/2010
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