The following information is derived from the FAAs Service Difficulty Re-ports and Aviation Maintenance Alerts. Cessna 172RG Cracked Landing Gear Actuator The l/h main landing gear failed to extend, but trailed. The pilot was able to rock it into the down and locked position and make a safe landing. Inspection revealed the (p/n 1281001-3) actuator body had cracked clear through the forward attach hole and half-way through the aft attach hole. This damage is unrelated to the condition addressed in service bulletin SEB01-2. The submitters suspect failure of the actuator body may have resulted from shear stress on (its) attach bolt holes due to the high number of gear cycles over the life of the aircraft. Part Total Time: 7005.9 hours. Superior Air Parts Blown Cylinder Heads Both cylinders (p/n SA52000-A20P) installed on an IO-520 in a Cessna 206 failed at takeoff power settings within two hours of each other. In both instances, the 288
Cracks, Jugs And Mags
The l/h main landing gear failed to extend, but trailed. The pilot was able to rock it into the down and locked position and make a safe landing. Inspection revealed the (p/n 1281001-3) actuator body had cracked clear through the forward attach hole and half-way through the aft attach hole.
Key Takeaways:
- Multiple mechanical failures were reported, including a cracked Cessna 172RG landing gear actuator, two Superior Air Parts cylinder heads that completely separated from their barrels, and a Niagara Air Parts starter clutch that failed due to insufficient braising.
- Ignition system issues involved a TCM magneto with a melted plastic cam follower after only 9.3 hours of operation, and another TCM magneto that experienced broken distributor teeth on a helicopter, possibly due to rotorcraft harmonics.
- Several incidents highlighted concerns about component longevity and material suitability, with failures occurring at varying operational times, from as low as 9.3 hours to over 7000 hours, often attributed to stress or design limitations.
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