# NTSB DEN83LA036: Swearingen SA-227AC, N2671V, Gillette, WY, December 21, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 20, 1982, 20:15 local (Dec 21, 1982, 03:15 UTC)
- Place: Gillette, WY
- Coordinates: 44.460178, -105.700798 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.4602&lon=-105.7008&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed, report December 20, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 70831
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN83LA036
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/70831/pdf
- Page: https://openairdocs.org/ntsb/DEN83LA036

## 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
  - landing gear,normal brake system - incorrect (cause)
  - maintenance,replacement - improper, company maintenance personnel (cause)
  - landing gear,normal brake system - asymmetrical (cause)
  - directional control - not possible, pilot in command
  - ground loop/swerve - uncontrolled, pilot in command
- In flight collision with terrain/water, takeoff
  - aborted takeoff - performed, pilot in command

## Analysis

DIRECTIONAL CONTROL WAS LOST IN THE EARLY STAGE OF THE TAKEOFF ROLL. THE ACFT DEPARTED THE RWY 400 FT DOWN THE RWY & TRAVELLED 85 FT OFF THE SIDE OF THE RWY. ONE RWY LIGHT WAS DESTROYED. THE ACFT HAD COME FROM THE FACTORY EQUIPPED WITH AN ANTI-SKID BRAKE SYSTEM. THE SYSTEM WAS REPLACED WITH A STANDARD BRAKING SYSTEM PRIOR TO THE ACFT'S FIRST PASSENGER FLT. DURING THIS PROCESS HYDRAULIC LINES ATTACHED TO THE PARKING BRAKE SHUTTLE VALVE UNDER THE INSTRUMENT PANEL AREA WERE INADVERTENTLY REVERSED, ALLOWING BRAKING ACTION TO TAKE PLACE ON THE OPPOSITE LANDING GEAR OF THE BRAKE PEDAL BEING DEPRESSED. THE FLT CREW WAS UNAWARE OF THIS CONDITION SINCE THEY HAD BEEN USING ASYMMETRICAL THRUST FOR DIRECTIONAL CONTROL UNTIL THIS TAKEOFF.

## Aircraft

- Registration: [N2671V](https://openairdocs.org/deregistered/N2671V-2000-02-25), registration cancelled 2000-02-25, S/N AC-437 (OpenAirDocs)
- Reported make and model: SWEARINGEN SA-227AC
- Registry model: [Swearingen SA227-AC](https://openairdocs.org/model/swearingen-sa227-ac) (registry code 8780603) (OpenAirDocs)
- Category: Airplane
- Serial number: AC-437
- Engines: GARRETT TPE331 1000 horsepower turbo prop
- Damage: Substantial damage
- Flight: Part 135
- Operator: Pioneer Airlines
- Registered owner: Pioneer Airlines
- Departed: C, DENVER, WY
- Destination: C, GILLETTE, WY
- Flight plan: VFR
- Airport: GCC, Gillette Campbelll County, runway 15, 6,500 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 3,752 total, 900 in this make and model, 1,688 as pilot in command, 340 in the last 90 days, 152 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 210° at 20 knots
- Visibility: 20 statute miles
- Temperature: 99 °F
- Altimeter: 29.00 inHg
- Observed at: GCC

## 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 19821220066619A](https://openairdocs.org/incident/19821220066619A), Dec 20, 1982: Swrngn SA227AC, Gillette, WY, Substantial damage. In early stage of takeoff roll, aircraft departed runway. Brake hydraulic lines had been reversed by mechanics.

## Other investigations on N2671V (1)

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.

- [NTSB FTW99FA223](https://openairdocs.org/ntsb/FTW99FA223), Aug 16, 1999: Swearingen SA-227-AC (N2671V), San Antonio, TX, substantial damage. Probable cause: The instructor pilot's failure to complete the Emergency Gear Extension Checklist, resulting in the inadvertent wheels-up landing. A factor was the instructor pilot's fatigued condition.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.