# NTSB FTW90LA035: Beech V35, N27007, Crosbyton, TX, November 25, 1989

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: November 25, 1989, 13:00 local (19:00 UTC)
- Place: Crosbyton, TX
- Coordinates: 33.639839, -101.230377 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.6398&lon=-101.2304&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report June 25, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 23080
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90LA035
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23080/pdf
- Page: https://openairdocs.org/ntsb/FTW90LA035

## Probable cause

IMPROPER OVERHAUL OF THE AIRCRAFT ENGINE BY MAINTENANCE PERSONNEL THAT LED TO THE COMPLETE LOSS OF ENGINE OIL DUE TO AN UNDERTORQUED OIL COOLER ASSEMBLY. FACTORS IN THE ACCIDENT WERE THE FAILURE OF MAINTENANCE PERSONNEL TO DETECT THE CONDITION DURING THE ANNUAL INSPECTION AND THE UNSUITABLE TERRAIN FOR THE FORCED LANDING.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - single engine aircraft
  - lubricating system,oil cooler - undertorqued (cause)
  - maintenance,overhaul,major - improper, other maintenance personnel (cause)
  - fluid,oil - loss,total (cause)
  - maintenance,annual inspection - inadequate, other maintenance personnel (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing - flare/touchdown
  - terrain condition - rough/uneven
  - landing gear,main gear - sheared
- Nose over, landing - roll

## Analysis

THE AIRCRAFT ENGINE FAILED, AFTER A COMPLETE LOSS OF OIL, DUE TO AN UNDERTORQUED OIL COOLER TO ENGINE ASSEMBLY THAT PERMITTED THE OIL TO BYPASS THE SEAL. THE ENGINE HAD BEEN IN SERVICE 162 HOURS SINCE OVERHAUL AND 3 HOURS SINCE ANNUAL INSPECTION. THE PILOT EXECUTED A FORCED LANDING TO ROUGH TERRAIN THAT CAUSED THE MAIN GEAR TO SHEAR, NOSE GEAR TO COLLAPSE, AND THE AIRCRAFT TO NOSE OVER.

## Aircraft

- Registration: [N27007](https://openairdocs.org/deregistered/N27007-1990-02-26), registration cancelled 1990-02-26, S/N D8364 (OpenAirDocs)
- Reported make and model: BEECH V35
- Registry model: [Beech V35](https://openairdocs.org/model/beech-v35) (registry code 1151538) (OpenAirDocs)
- Category: Airplane
- Serial number: 8364
- Airframe hours: 3927
- Engines: CONTINENTAL IO-520-BA 285 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Registered owner: Turner, Doyle Eugene
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, November 20, 1989, 3 hours before
- Departed: LBB, LUBBOCK, TX
- Destination: 1F7, DALLAS AIRPARK, TX
- Flight plan: VFR
- Airport: 8F3, Crosbyton, Tx.

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 53; private; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 3,000 total, 1,200 in this make and model, 3,000 as pilot in command, 40 in the last 90 days, 12 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 280° at 20 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point -0 °F
- Altimeter: 30.00 inHg

## 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 19891125046639A](https://openairdocs.org/incident/19891125046639A), Nov 25, 1989: Beech V35, Crosbyton, TX, Destroyed. Engine oil cooler was under-torqued at installation. Seal leaked oil on climbout. Engine seized. Crashed.

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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