ASN Wikibase Occurrence # 35198
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| Date: | Sunday 16 October 1988 |
| Time: | 10:17 |
| Type: |  Piper PA-32-300 |
| Owner/operator: | Northern Arizona Aircraft |
| Registration: | N4113R |
| MSN: | 32-40432 |
| Year of manufacture: | 1968 |
| Total airframe hrs: | 7026 hours |
| Engine model: | LYCOMING IO-540-K1A5 |
| Fatalities: | Fatalities: 5 / Occupants: 5 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Sedona, AZ -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | Sedona, AZ (SEZ) |
| Sedona, AZ (SEZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PLT & 4 FARE-PAYING PAX WERE ENROUTE TO THE GRAND CANYON NATIONAL PARK FOR AERIAL SIGHTSEEING. AN INTERNAL FAILURE OF THE LEFT MAGNETO (MAG) RESULTED IN A TOTAL LOSS OF ENGINE PWR. THE ACFT COLLIDED WITH TERRAIN & WAS DESTROYED BY GROUND FIRE. THE MAG WAS SUBJECT TO AD 78-09-07 R3 WHICH ADDRESSED IMPULSE COUPLING FAILURE. UPON EXAM IT WAS NOT FOUND TO HAVE BEEN IN COMPLIANCE WITH THE AD. THE AIR TAXI COMPANY HAD TWO EMPLOYEES; AN OWNER/PRESIDENT/PILOT AND A DIRECTOR OF MAINTENANCE/MECHANIC. THE MECHANIC ACKNOWLEDEGED HE FAILED TO FOLLOW THE CURRECT GUIDELINE IN THE CORRECT AD. AS A RESULT, THE IMPULSE COUPLING JAMMED WHEN THE FLYWEIGHT TO STOP PIN CLEARANCE BECAME ZERO. THIS ACTION SHEARED OFF TEETH ON THE ENGINE'S CRANKSHAFT GEAR & DOWEL PIN. CAUSE: TOTAL FAILURE OF THE MAGNETO'S IMPULSE COUPLING WHICH RESULTED IN A SHEARING OF THE CRANKSHAFT'S IDLER GEAR TEETH AND THE CRANKSHAFT DOWEL PIN.
Sources:
NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X27078
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
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