OPERATION AND INSTALLATION MANUAL
EN-1320
(2) Basic adjustment check
(only for governor LUN7815.03)
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 at its
feather stop 16. Place the propeller condition lever back to the maximum RPM.
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 12-28A). If not, adjust according to engine
operational manual.
d) Place the engine condition lever to the ground idle stop, guideline on the cam lever must align with
minimum ground pitch guideline on the governor scale (see fig.12-28 B).
e) Verify clearance between tracking lever pin and stop acc. to procedure in section 12.6.
f) Verify clearance between beta-ring and carbon block assembly according to procedure in section 12.6.
Figure 12-28 Governor LUN7815.03 - Basic adjustment check
(3) Propeller control system ground testing
(for governors LUN7815.02, LUN7815.03)
Perform after engine, propeller or propeller governor exchange in full extent.
Perform in the extent 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 oil to 60 +5
°
C (140 to 149°F).
c) Purge the propeller control system:
1 Place the engine condition lever into idle position.
2 Move the propeller condition lever into feather position, propeller RPM reduces to
≈
350 rpm.
3 Move back the propeller condition lever after about
≈
15 s delay to maximum RPM position and wait
to previous RPM.
4 Repeat the cycle 3 times, wait about 40 s between the cycles.
d) Propeller RPM check at idle (only for twin engine aircrafts).
1 Set engine control lever to idle.
2 Move the propeller control lever to maximum RPM position.
3 RPM difference at idle should be 40 RPM max. If higher, refer to Troubleshooting section in this
manual.
61-10-20
PROPELLER CONTROL SYSTEM
(Installation With Jihostroj LUN-Series Governor)
Page 12-26
2017-10-06
