POWER-PLANT MAINTENANCE INTERVALS
Maintenance Manual
ASK 21 Mi
Maintenance Manual
Engine Hours Period
Years Period
Once-only Maintenance after 1 hour: Retighten M8 bolts at prop.flange
0 - 150
O
450 - 600
O
1 - 5
O
150 - 300
O
600 - 750
O
5 - 10
O
300 - 450
O
750 - 900
O
10 - 15
O
Maintenance Task at different intervals:
Hour Intervals
Year Intervals
25
50
75
100
125
150
1
2
3
4
5
Coolant level check
O
O
O
O
O
O
Retighten propeller bolts
O
O
O
O
O
O
Check elastic tensioning cords of engine compartment doors
O
O
O
O
O
O
Check guide pulleys
O
O
O
O
O
O
Clean power-plant (while installed) & engine compartment
O
O
O
O
O
O
Disassemble and clean drainer valve & gaskets
O
O
O
O
O
O
Check fuel hose lines
O
O
O
O
O
O
Check electric wiring
O
O
O
O
O
O
Inspect control cables of throttle and prop. brake
O
O
O
O
O
O
Check & adjust idling speed
O
O
O
O
O
O
Check firm seating of engine mounting bolts
O
O
O
O
O
O
Check gas strut/extending spindle
O
O
O
O
O
O
Inspect rubber suspension buffers of engine mounting for cracks or other changes
O
O
O
O
O
O
Check engine compartment door hinges for firm seat or cracks
O
O
O
O
O
O
Check propeller stop block for function. If required, replace.
O
O
O
O
O
O
Check & retighten the 4 lateral set screws at the propeller head
O
O
O
O
O
O
Check secure seat of the lock nuts for the 3 tighteners
O
O
O
O
O
O
Check propeller shaft for radial play in the bearing seatings
O
O
O
O
O
O
Maintenance work at the engine as per Engine Manual
O
O
O
Check drive belt for wear
O
O
O
Check belt pulleys for wear
O
O
O
Inspect belt pulley bearings for play in the ball bearings
O
O
O
Check exhaust noise emission during engine ground run
O
O
O
Inspect engine as per Engine Manual
O
Disassemble and check exhaust silencer and its fairing
O
Exchange fuel pre-filter
O
Exchange fuel main filter
O
Inspect rubber coupling between crank shaft and lower drive pulley for cracks
O
Inspect engine as per Engine Manual
O
O
O
O
O
Check coolant level and its anti-freeze contents
O
O
O
O
O
Clean power-plant (while installed) & engine compartment
O
O
O
O
O
Fuel level indicator hose at the fuselage tank: check for leaks and condition
O
O
O
O
O
Inspect engine as per Engine Manual
O
Issue: 01.12.2007 mg /mh / mm
Revision: TN 04 / 09.09.09 M. Münch
7.14
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Summary of Contents for ASK 21 Mi
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