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TOMARK, s.r.o.
Airplane Maintenance Manual
Chapter 04 Limitations
Page 26
Issue: 04.APR 2016
04-30-20 Major Inspection Engine Mount
Relevant P/N Engine mount
SD4-A-6-021-N-2
The inspection is best performed with the engine removed, which
however is not mandatory.
The inspection is required to be performed each 2000h, but
recommended to be performed whenever the engine is removed from
the airframe.
Major Inspection engine mount
2000h
Preparatory Activities
Remove engine (recommended)
○
Clean the engine mount thoroughly
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Inspection
Visually inspect all engine mount struts for straightness using appropriate
straight ruler lengths.
○
Check torque of all attachment bolts.
○
At locations where bolt torque is below the specified values: remove bolt
and inspect for sights of wear or overload. Discharge the respective (stop)
nuts.
If a bent bolt is found the engine mount must be removed from the
airframe to further inspect the respective bearings on airframe and engine
mount side.
Report such condition to TOMARK.
○
Visual inspect entire top coat paint of engine mount for scratches and
cracks.
○
Where top coat cracks are found remove top coat in the affected area and
min 10mm further.
○
Perform dye penetrant check at all welding nodes and all identified top
coat crack locations.
○
In case of doubt remove top coat at entire node.
○
If cracks are found report to TOMARK before proceeding
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