# NTSB LAX88FA129: Beech V35B, N4103A, Oildale, CA, March 17, 1988

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: March 17, 1988, 12:41 local (20:41 UTC)
- Place: Oildale, CA
- Location: 35.4293° N, 119.0306° W: Placed by OpenAirDocs: center of Oildale, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.4293&lon=-119.0306&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal, 2 serious
- Status: Completed, report July 9, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 25814
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX88FA129
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/25814/pdf
- Page: https://openairdocs.org/ntsb/LAX88FA129

## Probable cause

IMPROPER MAINTENANCE GIVEN BY THE FIXED BASED OPERATOR.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, cruise - normal
  - eng assembly,crankshaft counterweights/vib damper - worn (cause)
  - propeller system/accessories,blade - fatigue (cause)
  - maintenance,overhaul - not performed, fbo personnel (cause)
  - propeller system/accessories,blade - separation (cause)
  - engine assembly,mount - worn (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, descent - emergency
  - terrain condition - mountainous/hilly

## Aircraft

- Registration: [N4103A](https://openairdocs.org/deregistered/N4103A-1989-07-17), registration cancelled 1989-07-17, S/N D9116 (OpenAirDocs)
- Reported make and model: Beech V35B
- Registry model: [Beech V35B](https://openairdocs.org/model/beech-v35b) (registry code 1151548) (OpenAirDocs)
- Category: Airplane
- Serial number: D-9116
- Airframe hours: 2823
- Engines: CONTINENTAL IO-520-BA 285 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: Hunsaker, Allen M.
- Registered owner: Hunsaker, Allen
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, November 3, 1987, 16 hours before
- Departed: DUCOR, CA
- Destination: FUL, FULLERTON, CA
- Airport: BFL, Meadows

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 2,800 total, 2,200 in this make and model, 2,600 as pilot in command, 4 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 360° at 6 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 28 °F
- Altimeter: 30.00 inHg
- Observed at: BFL, 10 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19880317071289A](https://openairdocs.org/incident/19880317071289A), Mar 17, 1988: Beech V35B, Bakersfield, CA, Destroyed, 2 fatal. Worn engine mounts caused prop fatigue and separation of prop blade vibration broke mounts causing pitch down crash

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.

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