inspect, repair, or overhaul the gearbox in accordance with  the manufacturer’s instructions for continued airworthiness.  Testing the propeller flange is not normal maintenance but  can be carried out if defects or cracks are suspected. The following checklist should be used for daily maintenance  checks. Repair, as necessary, all discrepancies before flight. The following checklist should be performed for all pre- flight checks. Repair, as necessary, all discrepancies and  shortcoming before flight. 20. Check propeller shaft bearing for clearance by  rocking propeller.  21. Inspect throttle choke and oil pump lever cables for  damage (end fittings, outer casing, and kinks). 1.  Verify ignition OFF. 2.  Drain water from fuel tank sump and/or water trap  (if fitted). 3.  Inspect carburetor rubber socket or flange for cracks  and verify secure attachment. 4.  Inspect carburetor float chamber for water and dirt. 5.  Verify security and condition of intake silencer and  air filter. 6.  Verify security of radiator mounting. Inspect radiators  for damage and leaks. 7.  Verify coolant level in overflow bottle and security  of cap. 8.  Verify coolant hoses for security, and inspect for leaks  and chafing. 9.  Inspect engine for coolant leaks (cylinder head,  cylinder base, and water pump). 10. Verify oil content for rotary valve gear lubrication and  security of oil cap. 11. Verify oil hoses for security, and inspect for leaks and  chafing (rotary valve gear lubrication system and oil  injection system). 12. Verify ignition coils/electronic boxes for secure  mounting, and check ignition leads and all electrical  wiring for secure connections and chafing. 13. Verify electric starter for secure mounting, and inspect  cover for cracks. 14. Verify engine to airframe mounting for security and  inspect cracks. 15. Verify fuel pump mounting for security, and inspect  all fuel hose connections (filters, primer bulbs, and  taps for security, leakage, chafing and kinks). 16. Verify fuel pump impulse hose for secure connections,  and inspect for chafing and kinks. 17. Verify safety wiring of gearbox drain and level plugs. 18. Inspect rubber coupling for damage and aging (C type  gearbox only). 19. Rotate engine by hand and listen for unusual noises  (first, double verify ignition OFF). 18. Verify that engine reaches full power rpm during  takeoff roll. 17. If possible, visually check engine and exhaust for  excessive vibration during warm up (indicates  propeller out of balance). 16. Check operation of all engine instruments during  warm up. 15. Dual ignition engines: check operation of both  ignition circuits. 14. Single ignition engines: check operation of ignition  switch (flick ignition off and on again at idling). 13. Start engine after assuring that area is clear  of bystanders. 12. Inspect exhaust for cracks, security of mounting,  springs, and hooks for breakage and wear, and verify  safety wiring of springs. 11. Verify that cooling fan turns when engine is rotated  (air cooled engines). 10. Check throttle, oil injection pump, and choke actuation  for free and full movement. 9.  Verify security of propeller mounting. 8.  Inspect propeller for splits and chips. If any damage,  repair and/or rebalance before use. 7.  Inspect engine and gearbox for loose or missing nuts,  bolts, and screws, and verify security of gearbox to engine mounting. 6.  Inspect engine and gearbox for oil leaks. 5.  Verify spark plug connectors for security. 4.  Verify oil tank content (oil injection engines). 3.  Inspect for coolant leaks. 2.  Check fuel content. 1.  Verify ignition OFF.  Pre-flight Checks Daily Maintenance Checks 11-23