85-10-20 Gearbox Magnet-Drain Plug
85-10-21 Removal of the Gearbox Magnet-Drain Plug
1. Remove the wire protection from the filler screw.
2. Dismount the filler plug [1].
3. Put a container (min. 2,5 l) below it.
4. Remove the wire protection [11] of the magnet drain plug.
5. Remove the magnet drain plug. [2].
6. Drain the gearbox oil through the included filter which is included in the scheduled
maintenance kit of Austro Engine for bigger pieces of material and non magnetic
material.
7. Dip the magnetic drain plug in a solvent of remove oil contamination for better debris
inspection.
8. Investigate the drain plug for accumulation of debris. (see Note below).
If this is the first gearbox oil inspection to be conducted on this engine (gearbox TSN:
100 h) a quantity like the one shown in Fig. 85 – 20 is acceptable, as slightly more
debris is not uncommon for the first flight hours.
Fig. 85 - 20
Acceptable quantity for first 100 h inspection
If the gearbox operation time is more than 100 h TSN, less debris is allowable. Thus
compare the magnetic drain plug with the one shown in Fig. 85 – 21. Should the
particles present on the magnetic drain plug be beyond the allowable size or quantity
the gearbox has to be replaced.
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