# Accident 19960729026049A: Boeing A75N1, Tracy, CA, July 29, 1996

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 29, 1996, 06:15 local time
- Place: Tracy, CA
- Damage: Destroyed
- Phase of flight: Fcd/Prec Ldg From Cruise
- Operating rules: Agricultural (Part 137)
- Operator: MBNG
- Location: 37.7304° N, 121.4205° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=37.7304&lon=-121.4205&mi=10
- Aircraft: N68251, a cancelled registration (https://openairdocs.org/deregistered/N68251-2004-05-26) (OpenAirDocs)
- Registry model: Boeing A75N1(PT17) (registry code 1380134, https://openairdocs.org/model/boeing-a75n1-pt17) (OpenAirDocs)
- Registry engine: Wright 975E&F-2&3 (registry code 67015, https://openairdocs.org/engine/wright-975e-f-2-3) (OpenAirDocs)
- Reported make and model: BOEING A75N1
- Reported engine: WRIGHT R97511
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 4,700 total, 1,030 in this make and model, 150 in the last 90 days
- NTSB investigation: [NTSB LAX96LA291](https://openairdocs.org/ntsb/LAX96LA291) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19960729026049A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(.4)THE PILOT REPORTED THAT THE ENGINE QUIT WHILE HE WAS EN ROUTE TO A JOB AND HE LANDED IN AN ALFALFA FIELD. THE AIRCRAFT COLLIDED WITH A DITCH WHICH WAS OBSCURED BY THE CROPS.  A POSTCRASH FIRE ERUPTED AND CONSUMED THE AIRCRAFT.  THE AIRCRAFT WAS EXAMINED BY AN FAA AIRWORTHINESS INSPECTOR.  HE REPORTED THAT THE ENGINE CRANKSHAFT WOULD ROTATE; HOWEVER, NO CORRESPONDING VALVE ACTION WAS NOTED ON ANY CYLINDER.  THE INSPECTOR OBSERVED A DISASSEMBLY OF THE ENGINE AND REPORTED THAT THE EIGHT SCREWS WHICH SECURE THE CRANKSHAFT HUB TO THE CRANKSHAFT GEAR HAD SHEARED.  THE CRANKSHAFT GEAR ROTATES ALL ACCESSORY DRIVE GEARS, INCLUDING THE MAGNETOS.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX96LA291](https://openairdocs.org/ntsb/LAX96LA291), Jul 29, 1996: Boeing A75N1 (N68251), Tracy, CA, destroyed. Probable cause: A loss of engine power due to the disengagement of the crankshaft gear from it's hub due to the overload shear of the eight retaining screws.

## Other reports on N68251 (1)

Matched to the same aircraft by N-number and date.

- [Incident 19920821038189I](https://openairdocs.org/incident/19920821038189I), Aug 21, 1992: Boeing A75N1 (N68251), Tracy, CA. Engine lost power on climb. Forced landing on highway. Found engine cylinder exhaust valve stuck open.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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