Beta & Reverse Lockout; Fuel Shutoff Lockout; 1600 Rpm Np Torque Setting - Thrush Aircraft S2RHG-T65 TURBO THRUSH Maintenance Manual

THRUSH AIRCRAFT, INC – MODEL S2RHG-T65 TURBO THRUSH
restrict propeller rpm to 1170 or below.
A. 1170 to 1400 RPM Np is prohibited on Ground.
B. Stabilized operation below 900 RPM Np is prohibited –
Except in feathered operation from 0 to 400 RPM Np.
Provides a positive lock to prevent unintentional movement of the power lever into beta
or reverse mode.
Provides a positive lock to prevent unintentional movement of fuel control lever to the
fuel cut off position.
The 1600 Np torque setting is adjusted using the three beta nuts on the propeller. Refer
to Figure 4-5 when following the steps below.
It is not necessary to cap the bleed air line when checking the
1600 RPM torque setting
A. Record the stabilized outside air temperature accurately and set the altimeter
window to 29.92. Record the pressure altitude.
B. Start the engine and allow the instruments to stabilize.
C. With the propeller lever full forward, advance the power lever until 1600 RPM
propeller speed is obtained.
D. Record the engine torque which is indicated on the torque meter.
E. Shut down the engine.
F. Refer to chart in Figure 4-5 and read the desired engine torque for the prevailing
ambient conditions.
G. Ensure that the beta valve clevis slot is flush with the beta valve cap nut.
Remove the propeller spinner and adjust the beta nuts, if necessary, to obtain
the desired engine torque. To facilitate the adjustment of the beta nuts, scribe a
line on the beta nuts and the low-pitch stop rods as shown in Figure 4-5. Use the
reference line to ensure that each nut is adjusted the same number of flats.
Turning the nuts six flats will provide approximately one (1) PSI change in the
engine torque. Standing in front of the propeller and facing the dome, make the
adjustments: to increase turn clockwise and to decrease turn counter-clockwise.
The torque meter should be within +/- one (1) psi of the predetermined value.
Effective: 9/16/05
AIRCRAFT MAINTENANCE MANUAL
*NOTE*
BETA & REVERSE LOCKOUT

FUEL SHUTOFF LOCKOUT

1600 RPM Np TORQUE SETTING

*NOTE*
4-27