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-F)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.
Ignition · impulse coupling · brokenJan 26, 1995
DURING ENGINE RUN-UP, PILOT REPORTED EXCESSIVE RPM DROP OF RT MAGNETO AND ALSO NO VACUUM. AN INVESTIGATION REVEALED THE REAR MAGNETO BEARING FROZE AND THE IMPULSE COUPLING BROKE OFF AND DESTROYED DRIVE GEAR THAT RUNS THE VACUUM PUMP AND THE REAR ACCESSORY CASE WAS CRACKED. OUTSIDE AIR TEMP WAS…
From FAA Service Difficulty Reports; matched by N-number and serial number.