THRUSH AIRCRAFT INC - MODEL S2R-G10
AIRPLANE MAINTENANCE MANUAL
Page 4-6 Effective: 03/26/2010
Mark propeller hub flange and the
engine shaft flange so that the
propeller can be reinstalled in its
original position. This will prevent
disturbing the propeller/engine
combination dynamic balancing if
the same propeller is to be
reinstalled.
Remove propeller retaining nuts and
bushings.
Using a proper hoist and straps to support
propeller, remove propeller and discard
propeller shaft O-ring.
PROPELLER INSTALLATION –
McCauley
Lube O-ring with clean engine oil and
install on propeller shaft.
Ensure that the propeller shaft
dam has been removed. The
dam can be removed using
Garrett puller P/N 285397-1-1 or
equivalent. The McCauley
propeller will not function
properly with the dam installed.
Install propeller (either feathered or on
start locks) in accordance with the
applicable propeller owner’s manual or
maintenance manual.
Lube beta tube with clean turbine engine
oil and insert into propeller shaft. Screw
tube in 35 turns. Do not lock at this time
as fine adjustment will be done later.
PROPELLER ADJUSTMENTS –
McCauley –Ref. Fig. 4-1
Accomplish propeller checks and
adjustments only when the aircraft engine
controls have been fully rigged to their
correct positions, the prop blade is parallel
with the horizon and the aircraft wings are
generally level. Zero the propeller
protractor on the propeller hub and take all
measurements at the blade station given in
the propeller owner’s manual, or Figure 4-
1.
The flight idle and reverse blade angle is
measured with the unfeathering pump
supplying steady oil pressure to the
propeller.
* NOTE *
The unfeathering pump draws oil
from the engine oil tank to actuate
the propeller. Bleed oil from the
prop is dumped into the reduction
gear box, not the engine oil tank. If
the unfeathering pump is operated
frequently or for prolonged periods,
it will pump the engine tank dry. If
you hear the pump suddenly
unload, cavitate or speed up, stop
the pump. You can pump the oil
out of the gearbox and back into the
oil tank by turning the propeller 50
revolutions by hand or by the
starter. It is not uncommon to
experience some oil loss overboard
from the vent.
CAUTION
WARNING
DO NOT USE THE STARTER TO
RETURN OIL TO THE ENGINE
TANK IF THE PROPELLER IS IN
THE FEATHERED
POSITION.
TURN THE PROPELLER BY
HAND ONLY IN THE NORMAL
DIRECTION OF ROTATION.
The feathered, start lock and reverse blade
angles are preset by the propeller
manufacturer. The flight idle blade angle is
hydraulically controlled by the position of
the beta tube. Remove the locking pin
(McCauley P/N B4795) before attempting
to turn the beta tube. Turning the beta
tube clockwise (looking aft) will decrease
the blade angle. Counterclockwise
movement will increase the blade angle.
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