ASN Wikibase Occurrence # 365482
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| Date: | Sunday 7 April 1991 |
| Time: | 12:48 LT |
| Type: | Piper J-4A |
| Owner/operator: | Michael Demaio |
| Registration: | N23179 |
| MSN: | 4-546 |
| Total airframe hrs: | 1853 hours |
| Engine model: | CONTINENTAL A-65 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mahopac, NY -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Danbury, CT (KDXR) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING AN INITIATED GO-AROUND AT MAHOPAC AIRPORT, MAHOPAC, NEW YORK, THE ENGINE EXPERIENCED PARTIAL POWER LOSS. FULL POWER COULD NOT BE DEVELOPED RESULTING IN DETERIORATED CLIMB CAPABILITIES. THE AIRPLANE COULD NOT CLEAR RISING TERRAIN AND HIT TREETOPS, EVENTUALLY CONTACTING THE GROUND. POST ACCIDENT EXAMINATION OF THE ENGINE REVEALED THAT THE LEFT MAGNETO WAS EXCESSIVELY WORN AND DETERIORATED CAUSING THE SPARKS TO BE ERRATICALLY DISPLACED TO THE SPARK PLUGS.
Probable Cause: THE ERRATIC PERFORMANCE OF THE LEFT MAGNETO RESULTING IN INADEQUATE CLIMB CAPABILITIES AND IN FLIGHT COLLISION WITH TERRAIN.
Accident investigation:
 |
|
Sources:
NTSB NYC91LA104
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 10:37 | ASN Update Bot | Added |
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