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.
Cessna Aircraft Company (Cessna) Model 172 Airplanes Modified by Supplemental Type…
May 26, 2011
Airframe (172M)Only with: Modified by STC SA01303WI (installation of TAE 125-01 or TAE 125-02-99 engine).
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 · magneto · inoperativeJul 7, 2009
EXCESSIVE MAG DROP. REMOVED MAG FOR INTERNAL INSPECTION AND FOUND THAT THE SHAFT HAD FAILED AT THE BASE OF THE SLOT THAT RETAINS THE POINT CAM. REMOVED THE SHAFT GEAR FROM THE CAM AND ONE SIDE OF THE SHAFT STAYED ATTACHED TO THE GEAR. (K)
From FAA Service Difficulty Reports; matched by N-number and serial number.