Multiple Piper aircraft models experienced significant structural integrity issues, including corroded firewalls, cracked fuselage bulkheads/doublers, and improperly drilled control components.
Critical flight control system failures were reported, such as a disconnected control yoke universal joint during flight and a stabilator control cable failing during inspection.
Other reported malfunctions included an internally failed landing gear circuit breaker, preventing gear retraction in a Piper Seneca.