# NTSB ANC83LA040: Taylorcraft BC-12-D, N39196, White Mountain, AK, January 31, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 31, 1983, 10:00 local (14:00 UTC)
- Place: White Mountain, AK
- Coordinates: 64.680168, -163.410476 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=64.6802&lon=-163.4105&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4097
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC83LA040
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4097/pdf
- Page: https://openairdocs.org/ntsb/ANC83LA040

## Sequence of events

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

- Loss of engine power(partial) - nonmechanical, approach - vfr pattern - final approach
  - weather condition - temperature extremes (contributing factor)
  - carburetor heat - not used, pilot in command (cause)
  - diverted attention, pilot in command (contributing factor)
- Loss of control - in flight, approach - vfr pattern - final approach
  - airspeed - not maintained, pilot in command (cause)
  - stall - inadvertent, pilot in command (contributing factor)
- Main gear collapsed, approach - vfr pattern - final approach
  - landing gear,ski assembly - overload (contributing factor)

## Analysis

THE PLT WAS DEMONSTRATING SKI LANDINGS ON RIVER ICE. THE OAT WAS AT LEAST MINUS 20 DEG F. AFTER A PROLONGED POWER-OFF DESCENT HE RECOGNIZED A NEED FOR ADDITIONAL POWER BUT THE ENG WOULD NOT RESPOND. THE PLT ATTEMPTED TO STRETCH HIS GLIDE BUT THE ACFT STALLED & THE RIGHT SKI-GEAR COLLAPSED. THE PLT LATER STATED HE HAD NOT CONSIDERED THE EFFECT OF THE EXTREME COLD ON THE NON-WINTERIZED ENG. HE COULD NOT RECALL HAVING THE CARB HEAT CONTROL ON, NOR DID HE KNOW THAT THE HEAT WAS REQUIRED TO PRECLUDE A TOO-LEAN MIXTURE FOR THIS ENG.

## Aircraft

- Registration: [N39196](https://openairdocs.org/deregistered/N39196-2013-02-11), registration cancelled 2013-02-11, S/N 6448, built 1945 (OpenAirDocs)
- Reported make and model: TAYLORCRAFT BC-12-D
- Registry model: [Taylorcraft BC12-D](https://openairdocs.org/model/taylorcraft-bc12-d) (registry code 8850316) (OpenAirDocs)
- Registry engine: [Continental A&C65 series](https://openairdocs.org/engine/continental-a-c65-series) (registry code 17003, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 6448
- Airframe hours: 2434
- Engines: CONTINENTAL C85-12 85 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Robert Martin
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, December 5, 1982, 55 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 3,150 total, 100 in this make and model, 3,000 as pilot in command, 150 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 19 °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 19830131003289A](https://openairdocs.org/incident/19830131003289A), Jan 31, 1983: Tcraft BC12D, White Mountain, AK, Substantial damage. Pilot failed to use carburetor heat properly and engine failed to respond in minus 20 degree temperature.

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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