NTSB Identification: LAX84LA265.
The docket is stored on NTSB microfiche number 24359.
Accident occurred Sunday, April 22, 1984 in QUINCY, CA
Aircraft: PIPER PA-24-260, registration: N9218P
Injuries: 3 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT WAS UNABLE TO START THE ENG & OBTAINED THE SERVICE OF A MECHANIC. THE MECHANIC DECIDED THAT THE PROBLEM WAS IN THE IGNITION SWITCH & DISCONNECTED THE P-LEADS WITH THE BELIEF THAT THIS WOULD MAKE THE MAGS CONTINUALLY 'HOT.' HOWEVER, WITH THE P-LEADS DISCONNECTED, THE MAGS SHOULD HAVE BEEN CONTINUALLY GROUNDED BY LEAF SPRING CONNECTORS. NEVER-THE-LESS, THE ENG STARTED WITH THE P-LEADS DISCONNECTED. AFTER TAKEOFF, WITH NO MAG CHECK, THE ENG BEGAN TO VIBRATE & MISFIRE & THE PLT TRIED TO RETURN TO THE ARPT. HOWEVER, THE ENG LOST ALL POWER & THE GEAR COLLAPSED DURING A FORCED LANDING, SHORT OF THE RWY. AN EXAM REVEALED THAT WITH THE P-LEADS DISCONNECTED, THE RGT LEAF SPRING CONNECTOR EFFECTIVELY GROUNDED THE RGT MAG, BUT THE LEFT MAG REMAIND UNGROUNDED FOR A TIME. THERE WAS EVIDENCE OF ARCING BETWEEN THE LEFT LEAF SPRING CONNECTOR & THE MAGNETO CASE. ALSO, THE SPARK VIBRATOR WAS FOUND TO BE WEAK. NO OTHER PREIMPACT MECHANICAL PROBLEM WAS FOUND.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

IGNITION SYSTEM..DISABLED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE..IMPROPER..OTHER MAINTENANCE PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..INITIATED..PILOT IN COMMAND



Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN



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