EN-1320
OPERATION AND INSTALLATION MANUAL
(3) Feather position adjustment
(for governor LUN7815.03)
a) Perform when feathering time is higher than 15s, adjusting is possible by using the stop 16 .
b) Remove seal and lock wire from the stop 16 - figure 12-30.
c) Move propeller control lever in cockpit to maximum RPM position, the lever "Rn" is at maximum RPM
stop 15.
d) Loose propeller control lever stop in the cockpit by about 3 mm (0.12 inch).
e) Loose the stop nut 16 and turns it 2 to 2,5 clockwise, lever "Rn" travel to feather position will increase.
f) Move propeller control lever easy up to the stop 16.
CAUTION:
IF THE LEVER "Rn" DOESN’T REACH THE STOP 16, IT MEANS, THAT LEVER MOVEMENT COULD
BE OBSTRUCTED INSIDE THE GOVERNOR. KEEP THE LEVER "Rn" IN THIS POSITION AND
RETURN THE STOP 16 BACK UNTIL IT TOUCH THE LEVER „Rn“ PIN, AND ANOTHER HALF OF
TURN BACK WITH THE SCREW.
g) Adjust clearance of the feather stop in the cockpit to 2 mm (0.08 inch) and secure.
h) Secure the stop 16 with lock wire.
i) Verify functionality according to procedure in section 12.7.
j) Make a record in the governor documentation.
(4) Idle RPM adjustment
(for governor LUN7815.02, LUN7815.03 – twin-engine aircrafts)
a) Minimum flight angle (and thus idle RPM) is adjustable with the stop 58.
b) Perform this adjustment only if:
1 Difference in idle RPM is higher than 40 rpm.
2 It is not possible keep this tolerance with idle power.
c) Verify again propeller idle speed after stop 58 adjustment at engine ground test, oil temperature
60
±
5°C (140±9°F).
d) Find value of dimension "B" in the governor documentation.
e) Measure dimension "B" for the governors according to figure 12-32 and compare with values in the
governor documentation. Before the measurement, verify real contact at stop 58.
f) If measured dimension "B" is different more than
±
0,1 mm (±0.004 inch) compare to reported value,
adjust dimension "B" according to the reported one by adjustment of the stop 58 and verify speed of
both propellers at engine ground test according to aircraft flight manual.
g) If both dimensions are equal to dimensions in the governor documentation, perform adjustment of the
stop 58 for both governors based on real idle RPM, see below, based on half of the difference. Find
speed difference half (
±
) in the table 12-5, where read value for the stop 58 adjustment.
61-10-20
PROPELLER CONTROL SYSTEM
(Installation With Jihostroj LUN-Series Governor)
Page 12-33
2017-10-06