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.
Flight controls · bellcrank · wornJan 1, 2001
RUDDER BELLCRANK PN 0712309-16AGW HAD EXTREME WEAR SEVERAL PLACES, BOTH SIDES. WHERE THEY ARE LOCATED THEY ARE DIFFICULT TO INSPECT AND LUBERCATE. MADE INSPECTION PANEL TO BE ABLE TO GAIN ACCESS TO THIS VITAL AREA. FAILURE OF THIS PART WOULD POTENTIALLY CAUSE GROUND LOOP.
From FAA Service Difficulty Reports; matched by N-number and serial number.