The following checklist should be performed for all preflight checks. Repair, as necessary, all discrepancies and shortcoming before flight.
- Verify ignition OFF.
- Check fuel content.
- Inspect for coolant leaks.
- Verify oil tank content (oil injection engines).
- Verify spark plug connectors for security.
- Inspect engine and gearbox for oil leaks.
- Inspect engine and gearbox for loose or missing nuts, bolts, and screws, and verify security of gearbox to engine mounting.
- Inspect propeller for splits and chips. If any damage, repair and/or rebalance before use.
- Verify security of propeller mounting.
- Check throttle, oil injection pump, and choke actuation for free and full movement.
- Verify that cooling fan turns when engine is rotated (air cooled engines).
- Inspect exhaust for cracks, security of mounting, springs, and hooks for breakage and wear, and verify safety wiring of springs.
- Start engine after assuring that area is clear of bystanders.
- Single ignition engines: check operation of ignition switch (flick ignition off and on again at idling).
- Dual ignition engines: check operation of both ignition circuits.
- Check operation of all engine instruments during warm up.
- If possible, visually check engine and exhaust for excessive vibration during warm up (indicates propeller out of balance).
- Verify that engine reaches full power rpm during takeoff roll.
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