ASN Wikibase Occurrence # 358815
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| Date: | Friday 23 June 1995 |
| Time: | 15:10 LT |
| Type: |  Piper PA-32R |
| Owner/operator: | Private |
| Registration: | N39620 |
| MSN: | 32R-7887123 |
| Total airframe hrs: | 1766 hours |
| Engine model: | LYCOMING TIO-540-S1AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Columbia, MO -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Iowa City, IA (KIOW) |
| Point Lookout, MO | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT REPORTED THAT HE HEARD A MUFFLED EXPLOSION FROM THE ENGINE COMPARTMENT. THE ENGINE QUIT AND FLAMES STARTED COMING OUT OF THE ENGINE COWLING. THE CABIN BEGAN FILLING WITH SMOKE, AND OIL BEGAN SPEWING ONTO THE WINDSCREEN. THE PILOT SUCCESSFULLY EXECUTED PROCEDURES FOR IN-FLIGHT FIRE AND SMOKE IN THE COCKPIT. HE THEN MADE AN EMERGENCY LANDING IN A FIELD. HOWEVER, BEFORE LANDING, THE PILOT DELAYED GEAR EXTENSION, SO THAT HE COULD REMAIN CLEAR OF OBSTRUCTIONS AND REACH A SUITABLE LANDING AREA. THE GEAR DID NOT HAVE ENOUGH TIME TO BE FULLY EXTENDED, AND IT COLLAPSED ON TOUCHDOWN. AN EXAMINATION OF THE AIRPLANE REVEALED THAT THE DUAL MAGNETO HAD SEPARATED FROM THE ENGINE. THE BOTTOM MAGNETO HOLD DOWN CLIP WAS FOUND IN THE COWLING, BUT NEITHER THE LOCKWASHER OR NUT WERE RECOVERED. AN EXAMINATION OF THE BOTTOM SURFACE OF THE MAGNETO HOUSING REVEALED TWO LONGITUDINAL MARKINGS (CHIPPED PAINT). THE BOTTOM CLIP HAD A SPACING WHICH MATCHED THE CHIPPED PAINT ON THE MAGNETO HOUSING, AS IF THE CLIP HAD MOVED LONGITUDINALLY RELATIVE TO THE HOUSING. AN EXAMINATION OF THE TOP MAGNETO HOUSING FLANGE, WHICH HAD SEPARATED FROM THE MAGNETO, REVEALED FRACTURE SURFACE MARKINGS INDICATIVE OF FATIGUE CRACKING BEFORE THE ONSET OF OVERSTRESS SEPARATION.
Probable Cause: A LOOSE (OR MISSING) NUT AND CLIP FOR THE BOTTOM MAGNETO STUD, DUE TO INADEQUATE MAINTENANCE, AND FATIGUE FAILURE OF THE MAGNETO HOUSING FLANGE, WHICH RESTULTED IN AN OIL LEAK, ENGINE COMPARTMENT FIRE, AND A FORCED LANDING. A FACTOR RELATING TO THE ACCIDENT WAS: THE NECESSITY FOR THE PILOT TO DELAY EXTENDING THE LANDING GEAR, SO THAT THE AIRPLANE WOULD CLEAR OBSTRUCTIONS AND REACH A FAVORABLE LANDING AREA.
Accident investigation:
 |
|
Sources:
NTSB CHI95LA196
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 18:28 | ASN Update Bot | Added |
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