THRUSH S2R – G10 - Page 68

THRUSH AIRCRAFT INC - MODEL S2R-G10
AIRPLANE MAINTENANCE MANUAL
PROPELLER
Hartzell 4-
blade
McCauley 4-
blade
McCauley 4-
blade
Model Number
HCB4TN-5NL-
LT10890N
4HFR34C653-[X]
[X]-L106FA-0
4HFR34C662-[X]
[X]-L108FA-0
Used On Engine Type TPE331-10 TPE331-10 TPE331-10
Diameter (inches) max. 109.5 106.0 108.0
Diameter (inches) min. 107.5 105.0 105.0
Measurement Station
(inches)
42 30 30
Start Lock Blade Angle
(degrees)
-1.4±0.1 6.0±0.2 6.0±0.2
Flight Idle Blade Angle
(degrees)
4.5±0.2 12.0±0.5 12.0±0.5
Feathered Angle (degrees) 81.2±0.5 87.4±0.2 87.4±0.2
Reverse Angle (degrees) -6.0±0.5 -4.0±0.2 -4.0±0.2
Figure 4-1: Propeller Specifications
* NOTE *
The beta tube lock cannot be
removed from the propeller in the
feathered position. Do this from the
start lock position.
Checking and adjusting the flight idle blade
angle requires taking the blades off the
start locks to the feathered position. To
accomplish this, move the power lever to
the full reverse position and turn on the
feathering pump to move the blades off the
start locks. Insert McCauley tool P/N
B5021 (Figure 4-2) into the four holes of
the propeller hub. Turn off the
unfeathering pump and pull the emergency
cutoff lever. The blades will move under
spring pressure to the feather position.
Remove the P/N B5021 tool. As an
alternate method, or, if hot engine is
required, start the engine in accordance
with normal start procedures. When ready
to shut down the engine, briefly pull the
power lever into reverse to release the
start locks and return to ground or flight
idle. Actuate the fuel shutoff switch with
the power lever in ground idle or flight idle.
The blades will feather under spring
pressure as the oil pressure decreases.
With the propeller protractor previously
zeroed in the propeller hub and with the
prop in the feathered position, move to the
face of the blade to be measured. Be sure
that the power lever is in the flight idle
position and the prop pitch servo valve is
pinned at 40º with a 1/8” diameter drill bit
or rigging pin. Verify the proper feathered
angle at this time.
If the propeller installation is new or if the
beta tube has been removed or disturbed,
install the beta tube into the housing.
Effective: 03/26/2010 Page 4-7