Multiple Piper aircraft models experienced structural integrity issues, including corroded and cracked firewalls, cracked fuselage doublers, and improperly drilled elevator horns.
Critical flight control systems failed in several instances, such as a separated control yoke shaft universal joint and a stabilator control cable failure at a swage area during inspection.
Component malfunctions were also reported, including an internally failed 5-amp landing gear control circuit breaker that did not visually trip.