OPERATION AND INSTALLATION MANUAL
EN-1320
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 stop and fix it.
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.
B. Propeller Governor LUN7816.(-)
(1) Basic adjustment check
a) Propeller condition lever must be placed in maximum RPM position and then the lever "Rn" must be at
maximum RPM stop 15.
b) Place the propeller condition lever into the feather position and fix, the lever "Rn" must be located at its
feather position 16. Place the propeller condition lever back to the maximum RPM position.
c) Place the engine condition lever to the idle stop, guideline on the cam lever must align with minimum
flight pitch guideline on the governor scale (figure 12-23A). The pin of outer coaxial valve must touch
the idle stop.
d) Place the engine condition lever into maximum reverse position, guideline on the cam lever must be
aligned with BETA range on the governor scale (figure 12-23B).
e) Verify element 32 setting using feeler gauge according to procedure in section 12.6.
f) Verify a side clearance between the beta-ring and the carbon block assembly according to procedure
in section 12.6.
(2) Propeller control system ground testing
Perform after engine, propeller or propeller governor exchange in full scope.
Perform in the sufficient appropriate scope to verify appropriate functionality after exchange of other
propeller control system instruments.
a) Start the engine according to the aircraft flight manual.
b) Warm-up engine lubricating oil to 60 +5
°
C (140 to 149°F).
61-10-20
PROPELLER CONTROL SYSTEM
(Installation With Jihostroj LUN-Series Governor)
Page 12-28
2017-10-06
