ASN Wikibase Occurrence # 132903
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| Date: | Sunday 25 September 1994 |
| Time: | 13:50 LT |
| Type: |  Piper PA-32RT-300T |
| Owner/operator: | Aero Haven, Inc. |
| Registration: | N39658 |
| MSN: | 32R-7887135 |
| Total airframe hrs: | 1429 hours |
| Engine model: | Lycoming TIO-540-S1AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | San Mateo, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | San Carlos, CA (KSQL) |
| Big Bear City, CA (L35) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRCRAFT LOST ENGINE POWER AFTER TAKEOFF AND WAS FORCED TO LAND ON A RESIDENTIAL STREET. THE ENGINE HAD BEEN OVERHAULED BY AN FAA-CERTIFIED REPAIR STATION 5 MONTHS AND 150 FLIGHT HOURS BEFORE THE ACCIDENT. EXAMINATION OF THE ENGINE MAGNETO REVEALED INTERNAL CORROSION AND ELECTRICAL ARCING AT THE BREAKER POINTS. THE INSULATION ON THE 'P' LEAD WIRE WAS CRACKED ALONG ITS ENTIRE LENGTH EXPOSING BARE WIRE AT ONE POINT. GROUNDING OF THE 'P' LEAD AS A RESULT OF A BARE WIRE TOUCHING THE AIRFRAME WOULD HAVE THE SAME EFFECT AS THE IGNITION SWITCH IN THE OFF POSITION.
Probable Cause: A deteriorated magneto grounding ('P' lead) and failure of maintenance personnel to detect this condition when the engine was reinstalled in the airframe after overhaul. The lack of suitable terrain for the forced landing was a factor.
Accident investigation:
 |
|
Sources:
NTSB LAX94LA377
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 19:03 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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