EN-1320
OPERATION AND INSTALLATION MANUAL
e) Maximum RPM check
1 Propeller control lever in maximum RPM position.
2 Move engine control lever to maximum take-off power position.
3 Maximum ground RPM should be 2080 -120 rpm.
NOTE:
Specified value for RPM is only for information. It depends on engine performance and atmospheric
conditions.
f) Feathering pump heating leg pressure check (only when the feathering pump is installed)
1 Move engine control lever to maximum continuous power position.
2 “Feathering Pump” is not lit.
g) Propeller control lever function check.
1 Engine control lever in maximum continuous power position.
2 Set - with propeller control lever - propeller RPM to 1900 rpm, then reduce RPM with propeller
control lever to 1700 rpm and back to previous position.
3 Propeller speed must be adequate to propeller control lever position.
WARNING : TORQUE MUST NOT EXCEED 100%!
h) Speed in reverse mode and reverse power check
1 Set propeller control lever to maximum RPM position.
2 Place engine control lever to idle.
3 Move engine control lever over the stop, move slowly and smoothly into maximum reverse position
- for period sufficient to read operational values. Verify power in reverse mode of operation with
engine operational manual.
4 Observe switching on the BETA lamp during transition into reverse.
NOTE:
RPM in reverse should be in the range of 1880-2030 rpm at ambient temperature
±
50
°
C (-58° to
122°F) and H=0 km/h.
5 Move engine control lever slowly and smoothly back over idle stop, observe switching off the BETA
lamp during transition from reverse. Idle RPM must be the same like before.
i) Check of feathering
(installation with feathering pump)
1 „AUTOMATIC FEATHERING“ check.
(only when this function is involved)
a Verify „AUTOMATIC FEATHERING“ function according to aircraft flight manual.
2 „MANUAL FEATHERING“ check.
a Verify „MANUAL FEATHERING“ according to aircraft flight manual.
b Verify time between switching on and off for “FEATHERING PUMP” lamp, the time must be
12 - 15 s.
3 „EMERGENCY FEATHERING“ check.
a Switch off “FEATHERING” breaker.
b Set engine control lever to idle.
c Move propeller control lever from maximum RPM position to feather position.
d Propeller speed is about 350 rpm in feather position.
e Move propeller control lever back to maximum RPM position. Propeller speed before and after
should be the same.
61-10-20
PROPELLER CONTROL SYSTEM
(Installation With Jihostroj LUN-Series Governor)
Page 12-27
2017-10-06
