Propeller Group
1. Check propeller bolts for torque and
safeties.
2. Inspect blades and hub for cracks,
corrosion, damage, etc.
3. Inspect spinner and backing plate.
Engine Group
Danger
Ground magneto primary circuit before
working on engine.
1. Check for oil/fuel leaks.
2. Check for particles on oil suction screen
and sump drain plug.
3. Drain oil and refill.
4. Perform cylinder compression test.
5. Clean the spark plugs. Adjust gap at
.018” to .022”.
6. Check and set magneto timing at 20
0
.
7. Check magneto breaker points and
lubricate breaker point felt.
8. Clean oil suction and oil pressure
screens
9. Inspect the wet type foam air filer.
10. Inspect the exhaust manifold for cracks
(carb and cabin heat shroud removed).
150 HR INTERVALS (Ref. AD-CF-90-
03R2)
11. Inspect the heat shrouds for cracks,
etc.
12. Inspect the motor mount fuselage and
engine attachment points and braces.
13. Inspect the rubber engine vibration
isolating mounts for cracks damage, etc.