Stuck Throttle
Broken Alternate Air Valve
Pilot reported throttle stuck half way open during flight. Disassembled wye pipe housing the alternate air flapper valve and filter. Discovered most of the flapper valve broken off and lodged in the throttle body, preventing the throttle from closing. Installed new alternate air flapper valve assembly (p/n 15710-002). The failure seems to originate where the radius of the hinge meets the flat surface of the valve on either side of the sandwiched flapper.
Part total time: Unknown
Inflight electrical failure
Master Control Unit Lost Power
During a post-maintenance test flight after engine installation, the aircraft lost electrical power on climb out after a touch-and-go. Both alternators went off-line and main battery voltage began to drop. Remedial efforts failed to restore power. Emergency was declared; a successful landing ensued. Investigation revealed the master control unit had lost power during climb out.
Part total time: 165.0 hours
Excessive elevator play
Loose Pitch Trim Motor Assembly
Found excessive play in elevator during 100-hour inspection. Investigation revealed the pitch trim motor was loose in its mounting plate. Removed pitch trim motor and disassembled. Found two out of four mounting screws completely backed out, and the other two with 1-2 threads of engagement. This issue has been found on two other aircraft.
Part total time: 2774.0 hours
Tripped Circuit breakers
Damaged Data Logger Wiring
Pilot found stall warning and fuel-quantity circuit breakers tripped. Troubleshooting found connectors for the recoverable data logger were corroded, burned and melted. Installed a new P1048 connector and installed repaired data logger.
Part total time: Unknown
Complete Electrical Failure
Failed Master Control Unit
Aircraft’s electrical system completely failed while en route. Troubleshooting had MFD/PFD and nav/comms online briefly. Circuit breakers popped, electrical systems all were offline with loss of flaps, trim control, nav and comm. Turned off all electrical components and navigated with an EFB. Flew with battery-powered backup of airspeed/attitude/altitude. Made traffic calls with handheld radio at non-towered airport. Landed without flaps or trim control. Investigation revealed a burned-out/charred master control unit.
Part total time: 2827.0 hours
