These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
Teledyne Continental Motors (TCM) IO-520, TSIO-520, and IO-550 Series Reciprocating…
Sep 9, 2009
Engine (IO 520 SERIES)Only with: SAP investment cast cylinder assemblies P/Ns SA52000-A1, SA52000-A20P, SA52000-A21P, SA52000-A22P, SA52000-A23P, SA55000-A1, or SA55000-A20P installed.
AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.
Service Difficulty Reports (1)
Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.
Landing gear · shaft · crackedFeb 1, 1995
NOSE GEAR STEERING SHAFT ASSY CRACKED 75 PERCENT AROUND AT HOLE FOR SHIMMEY DAMPENER ARM ROLL PIN. CRACK NOT VISIBLE UNTIL PART WAS COMPLETELY REMOVED. ONLY EVIDENCE OF PROBLEM WAS LOOSE ROLL PIN. SUBMITTER RECOMMENDS REGULAR INSPECTION OF ROLL PINS FOR LOOSENESS.
From FAA Service Difficulty Reports; matched by N-number and serial number.