ASN Wikibase Occurrence # 35198
Last updated: 19 December 2014
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Date:16-OCT-1988
Time:1017
Type:Silhouette image of generic PA32 model; specific model in this crash may look slightly different
Piper PA-32-300
Owner/operator:Northern Arizona Aircraft
Registration: N4113R
C/n / msn: 32-40432
Fatalities:Fatalities: 5 / Occupants: 5
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:Sedona, AZ -   United States of America
Phase: Approach
Nature:Unknown
Departure airport:Sedona, AZ (SEZ)
Destination airport:Sedona, AZ (SEZ)
Narrative:
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: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001213X27078


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
Number of views: 661

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