# NTSB ANC91FA001: Hughes 500D, N1107G, Kennsington, AK, October 4, 1990

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Field investigation · Final report
- Date: October 4, 1990, 15:20 local (23:20 UTC)
- Place: Kennsington, AK
- Coordinates: 58.579593, -134.769393 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=58.5796&lon=-134.7694&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 2 uninjured
- Status: Completed, report November 23, 1992
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5473
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91FA001
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5473/pdf
- Page: https://openairdocs.org/ntsb/ANC91FA001

## Probable cause

THE LOSS OF CONTROL DURING TAKEOFF DUE TO DYNAMIC ROLLOVER. CONTRIBUTING TO THE ACCIDENT WAS THE PILOT-IN-COMMAND'S SELECTION OF AN UNEVEN LANDING AREA.

## Sequence of events

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

- Roll over, takeoff
  - terrain condition - rough/uneven (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (contributing factor)
  - aircraft control - not maintained, pilot in command (cause)

## Analysis

THE PILOT-IN-COMMAND WAS UNABLE TO FIND A FLAT SPOT TO SET THE HELICOPTER ON TO PICK UP HIS PASSENGERS. HE NOSED THE HELICOPTER INTO THE SIDE OF THE MOUNTAIN AND MAINTAINED THE AFT PORTION OF THE SKIDS AT A HOVER. THE PASSENGERS LOADED THEMSELVES AND WERE STRAPPED IN WHEN THE PILOT BEGAN HIS TAKEOFF. HE APPLIED POWER AND THE HELICOPTER BEGAN SETTLING AFT. HE CONTINUED TO APPLY POWER AND THE HELICOPTER ROLLED OVER ONTO ITS LEFT SIDE AND TURNED 90 DEGREES TO ITS LEFT. THE PILOT DID NOT RECALL HEARING AN ENGINE-OUT WARNING AND THE CIRCUIT BREAKER WAS FOUND IN THE OUT POSITION. EXAMINATION OF THE HELICOPTER AND TEST RUN OF THE ENGINE SHOWED NO REASON FOR A LOSS OF ENGINE POWER OR MECHANICAL FAILURE. THE TERRAIN WAS UNEVEN AND VERY ROCKY.

## Aircraft

- Registration: [N1107G](https://openairdocs.org/deregistered/N1107G-2002-07-27), registration cancelled 2002-07-27, S/N 210899D, built 1981 (OpenAirDocs)
- Reported make and model: HUGHES 500D
- Registry model: [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d) (registry code 4470706) (OpenAirDocs)
- Registry engine: [Allison 250 SER 250HP](https://openairdocs.org/engine/allison-250-ser-250hp) (registry code 03002, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Serial number: 210899D
- Airframe hours: 4266
- Engines: ALLISON 250-C20-B 420 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Part 135
- Registered owner: Temsco Helicopters, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, September 5, 1990, 45 hours before
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 32; commercial; instrument ratings: helicopter; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 4,925 total, 1,850 in this make and model, 4,525 as pilot in command, 205 in the last 90 days, 35 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 60 statute miles
- Lowest ceiling: none
- Temperature: 37 °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 19901004044039A](https://openairdocs.org/incident/19901004044039A), Oct 4, 1990: Hughes 369C, Kennsington, AK, Substantial damage. Slope landing. Chopper rolled over as pilot tried to lift into full hover.

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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