OPERATION AND INSTALLATION MANUAL
EN-1320
7 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.
4 "CONTROL FEATHERING" function check .
a Place engine control lever to maximum continuous power position.
b Set with propeller control lever propeller speed to 1900 rpm.
c Switch on the "FEATHERING" breaker.
d Press "TEST - FEATHERING" button.
e Observe "FEATHERING PUMP" switching on
f Immediately after energizing the "FEATHERING PUMP" lamp release the button, lamp will
extinguish. Propeller speed must stand constant when the lamp is energized.
g Move propeller control lever to maximum propeller RPM position.
h Place engine control lever to idle stop.
j) Check of feathering
(installation without feathering pump)
1 "EMERGENCY FEATHERING" function check
a Engine control lever set to idle stop.
b Move propeller control lever from maximum RPM position to feather position.
c Propeller speed should be about 350 rpm.
d Loose propeller control lever and move back to maximum propeller rpm position. Propeller
speed before and after should be the same.
e Verify propeller for leakage.
f Record the test into the propeller logbook.
12.8 FURTHER ADJUSTMENT
A. Propeller Governor LUN7815.(-)
(1) Maximum RPM adjustment
(for governors LUN7815.02, LUN7815.03)
To be performed: after control flight
61-10-20
PROPELLER CONTROL SYSTEM
(Installation With Jihostroj LUN-Series Governor)
Page 12-30
2017-10-06
