# NTSB DEN86LA019: Beech F33A, N4956M, Santa Teresa, NM, November 9, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: November 9, 1985, 10:30 local (17:30 UTC)
- Place: Santa Teresa, NM
- Coordinates: 31.839765, -106.680961 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=31.8398&lon=-106.6810&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16882
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN86LA019
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16882/pdf
- Page: https://openairdocs.org/ntsb/DEN86LA019

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, takeoff - initial climb
  - engine assembly,valve,intake - movement restricted (cause)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - gear extension - not performed, pilot in command (cause)
  - diverted attention, pilot in command (cause)

## Analysis

THE PLT REPORTED THE CYLINDER HEAD TEMP BEGAN 'FALLING BACK OUT OF GREEN' SHORTLY AFTER TAKEOFF. THE PLT REVERSED DIRECTION & LANDED AT THE ARPT, BUT FAILED TO EXTEND THE GEAR, SUBSTANTIALLY DAMAGING THE ACFT. THE INVESTIGATION OF THEENG REVEALED THE EXHAUST VALVE ON THE NO. 3 CYLINDER STUCK OPEN.

## Aircraft

- Registration: [N4956M](https://openairdocs.org/aircraft/N4956M), registered now, S/N CE-781, built 1978 (OpenAirDocs)
- Reported make and model: BEECH F33A
- Registry model: [Beech F33A](https://openairdocs.org/model/beech-f33a) (registry code 1151425) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: CE-781
- Airframe hours: 1858
- Engines: CONTINENTAL IO-520-BA 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Registered owner: R. L. Guffy, Inc.
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, August 7, 1985, 111 hours before
- Destination: LRN, LAS CRUCES, NM
- Airport: 5T6, Santa Teresa, runway 10, 5,400 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 456 total, 456 in this make and model, 45 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 10 knots
- Visibility: 8 statute miles
- Lowest ceiling: none
- Temperature: 66 °F, dew point 34 °F
- Altimeter: 30.00 inHg
- Observed at: ELP, 17 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 19851109061339A](https://openairdocs.org/incident/19851109061339A), Nov 9, 1985: Beech F33A, Santa Teresa, NM, Substantial damage. Partial power loss after takeoff. Returned to airport. Gear up landing. Exhaust valve stuck open. Carbon on stem.

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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