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Feature Article: Service Difficulty Reports (SDRs)
SDRs are a mechanics’ report on maintenance problems.
These are collected by the FAA and aircraft manufacturer and passed
on to maintenance facilities as ADs (Airworthiness Directive)
or as a maintenance suggestion. SDRs make up about 10% of all
reported problems.
The most common items reported are those under the greatest
stress. Exhaust valves, crankshaft weights, and valve train problems
are most common. Cylinder reports relate to cracks at exhaust
port area. Magneto problems relate to failed coils. Certain engine
models are subject to specific reports related to inherent weakness
such as case cracking in Continentals. Lycoming has engines with
valve wobble problems. If ever you own an airplane, get an SDR
listing for it.
Last Modified November 17, ©2019 TAGE.COM
