Beechcraft A36 Bonanza
Stator And Rectifier Failure
During descent, electric power was lost. Selected standby alternator. Unable to extend gear electrically; manually extended gear and landed uneventfully. Removed alternator (p/n 649304). Repair station replaced the stator and rectifier.
Part total time: Unknown
Beechcraft 58 Baron
Cracked Solder Joint
Pilot reported left alternator was intermittent (indicator light was flashing). Inspection revealed a cracked solder joint on the alternator at the base of the A+ output terminal.
Part total time: 41.0 hours
Cessna 172N Skyhawk
Broken Power Terminal
In cruise, the alternator dropped off line. Switch and circuit breaker checked okay. Crew experienced intermittent flap, radio and light failures. Investigation revealed the power terminal had snapped off and was arcing to the alternator. The battery was drained beyond recovery and was replaced with new. The alternator was replaced and alternator wiring repaired as required.
Part total time: Unknown
Cessna T210L Turbo Centurion
Low Voltage Output
Voltmeter indicated a discharge at 1000 rpm. Normal voltage should be 28.5+-0.5. Voltmeter indicated 25.0 @ 1000 rpm, with 37 amps. At 1700 rpm, 27.8v, 42 amps; at 2000 rpm, 27.8v, 39 amps.
Part total time: 84.0 hours
Cessna 337G Skymaster
Loose Frame Bolts
Front engine charging system went intermittent, then inoperative. Examination found three bolts holding together the alternator frame were loose despite secure and untouched factory safety wiring. Disassembly revealed the loose frame allowed the stator to contact the rotor.
Part total time: 138.0 hours
Piper PA-28-181 Archer II/II
Seized Alternator
The aircraft was in the pattern when its pilots noted the alternator was no longer charging. A strong burning odor entered the cabin. On-ground inspection found the alternator had seized, causing the alternator belt to overheat and melt.
Part total time: Unknown
Piper PA-34-200 Seneca
Broken Rotating Assembly
In-flight failure of the left alternator resulted in smoke coming from the cowl. Aircraft landed safely. Alternator would not turn when turning the propeller. Inspection revealed a diode was missing. Further inspection revealed approximately 1”x1” piece of the rotating assembly had broken off and was lodged in the alternator. Damage to the wiring was also noted.
Part total time: Unknown
