# NTSB DEN91LA080: Stinson 108-2, N9759K, Santa Fe, NM, June 7, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 7, 1991, 12:24 local (18:24 UTC)
- Place: Santa Fe, NM
- Coordinates: 35.810901, -105.979103 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.8109&lon=-105.9791&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 5, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 18095
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN91LA080
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18095/pdf
- Page: https://openairdocs.org/ntsb/DEN91LA080

## Probable cause

A FORWARD AFT PILOT SEAT ADJUSTMENT LOCKING MECHANISM FAILURE.

## Analysis

DURING TAKEOFF RUN, THE FORWARD AFT PILOT SEAT ADJUSTMENT RELEASED AND THE SEAT WENT FULL AFT.  THE PILOT COULD NOT REACH THE CONTROLS TO APPLY CORRECTIONS AND THE AIRCRAFT DEPARTED THE SIDE OF THE RUNWAY, ENTERED SOFT TERRAIN, AND FLIPPED OVER.

## Sequence of events

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

- Loss of control - on ground/water, takeoff - roll/run
  - fuselage,seat - disengaged (cause)
- On ground/water encounter with terrain/water, takeoff - roll/run
  - terrain condition - soft

## Aircraft

- Registration: [N9759K](https://openairdocs.org/deregistered/N9759K-2013-04-26), registration cancelled 2013-04-26, S/N 108-2759, built 1947 (OpenAirDocs)
- Reported make and model: STINSON 108-2
- Registry model: [Universal Stinson 108-2](https://openairdocs.org/model/universal-stinson-108-2) (registry code 9230416) (OpenAirDocs)
- Registry engine: [Franklin 6A4165 series](https://openairdocs.org/engine/franklin-6a4165-series) (registry code 27025, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1083759
- Engines: CONTINENTAL O-470 230 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Hoback, Frank
- Airport: SAF, Santa Fe Municipal, runway 2, 8,300 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 54; airline transport, commercial, flight instructor; airplane ratings: single-engine sea, multi-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; flight hours: 10,000 total, 40 in this make and model, 4,000 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 250° at 8 knots
- Visibility: 40 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F

## 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 19910607020649A](https://openairdocs.org/incident/19910607020649A), Jun 7, 1991: Univar STC108, Santa Fe, NM, Substantial damage. Seat unlocked on takeoff. Ran off rulnway into sand. Nosed over.

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

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