# NTSB MKC85LA164: Brantly Helicopter B-2, N6799D, Denison, IA, July 3, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 2, 1985, 20:00 local (Jul 3, 1985, 01:00 UTC)
- Place: Denison, IA
- Coordinates: 42.010761, -95.34066 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.0108&lon=-95.3407&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33994
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC85LA164
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33994/pdf
- Page: https://openairdocs.org/ntsb/MKC85LA164

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, approach
  - throttle/power control - improper (cause)
  - maintenance,adjustment - improper (cause)
- Forced landing, approach
  - autorotation - performed, pilot in command
- Hard landing, landing - flare/touchdown
  - flare - misjudged, pilot in command (cause)

## Analysis

PLT REPORTS THAT THE ENG IDLE SETTING WAS TOO LOW AND THE ENG QUIT WHEN HE REDUCED POWER DURING A PRACTICE AUTOROTATION. THE ACFT TOUCHED DOWN HARD AND THE MAIN ROTOR CONTACTED TAIL BOOM.

## Aircraft

- Registration: [N6799D](https://openairdocs.org/deregistered/N6799D-2013-05-02), registration cancelled 2013-05-02, S/N 20, built 1959 (OpenAirDocs)
- Reported make and model: Brantly Helicopter B-2
- Registry model: [Brantly B-2](https://openairdocs.org/model/brantly-b-2) (registry code 1440502) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 19
- Airframe hours: 1295
- Engines: LYCOMING VO-360-A1A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Romaine L. Bendixen
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, June 25, 1985, 4 hours before
- Airport: DNS, Denison Muni, runway 35, 2,200 × 200 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; flight instructor, commercial, airline transport; airplane ratings: multi-engine land, single-engine land; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 6,591 total, 263 in this make and model, 5,686 as pilot in command, 27 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 360° at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 75 °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 19850702036629A](https://openairdocs.org/incident/19850702036629A), Jul 2, 1985: Hynes B2, Denison, IA, Substantial damage. During practice autorotation, engine quit. Made hard landing during actual autorotation.

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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