9 Overhaul
9.1 Major Overhaul
Major overhaul must be performed by the manufacturer or overhaul shops, authorized by the
manufacturer. Therefore, the engine has to be forwarded to the manufacturer or an authorized
overhaul shop, after the operating time limit has been reached.
The permissible operating time (TBO) is determined by the latest issue of Technical
Bulletin No. 9.
9.2 Major Repair
Major repair and major modifications must be performed only by the manufacturer or licensed
fixed base operators, authorized by the manufacturer.
After ground or obstacle contact of the propeller, the engine has to be disassembled in any
case and the crankshaft has to be checked outside the engine. Eccentricity measurement of
crankshaft or propeller flange at installed conditions is inaccurate and not acceptable.
If ground or obstacle contact of the propeller has not been mentioned when ordering repair or
major overhaul of an aero-engine, the liability of the owner for sequential damages will continue
even after repair or major overhaul has been performed.
A change of the propeller hub has to be considered a major repair in any case.
To Next Page
Loading...
