# NTSB MKC86FA082: Hiller UH-12B, N5307V, Fall River, KS, April 7, 1986

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Field investigation · Final report
- Date: April 7, 1986, 11:00 local (17:00 UTC)
- Place: Fall River, KS
- Coordinates: 37.600131, -96.019752 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.6001&lon=-96.0198&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 34062
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC86FA082
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34062/pdf
- Page: https://openairdocs.org/ntsb/MKC86FA082

## Sequence of events

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

- In flight collision with object, approach - vfr pattern - downwind
  - object - tree(s) (contributing factor)
  - planned approach - improper, pilot in command (cause)
  - airspeed - not maintained, pilot in command (cause)
  - rotor rpm - not maintained, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE HELICOPTER FLEW THROUGH THE TOPS OF TREES NEXT TO A PLOWED FIELD AND IMPACTED ALMOST STRAIGHT DOWN IN THE PLOWED FIELD AND NOSED OVER TO THE INVERTED POSITION. THE PILOT STATED THAT HE HAD INTENDED TO LAND IN THE FIELD AND ALLOWED THE AIRSPEED AND MAIN ROTOR RPM TO DECREASE DURING THE DESCENT. AFTER HE SAW THE TREES, IT WAS TOO LATE TO RECOVER.

## Aircraft

- Registration: [N5307V](https://openairdocs.org/deregistered/N5307V-2004-04-20), registration cancelled 2004-04-20, S/N 659, built 1954 (OpenAirDocs)
- Reported make and model: HILLER UH-12B
- Registry model: [Hiller UH-12B](https://openairdocs.org/model/hiller-uh-12b) (registry code 4360110) (OpenAirDocs)
- Registry engine: [Franklin 6VS-335 series](https://openairdocs.org/engine/franklin-6vs-335-series) (registry code 27040, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 659
- Airframe hours: 2196
- Engines: FRANKLIN O-335-5D 210 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Personal, Part 91
- Registered owner: Russell B. Davisson
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, December 2, 1983, 53 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; student; airplane ratings: single-engine land; medical: class 2, expired; seat: right; flight hours: 70 total, 49 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 10 knots
- Visibility: 5 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 72 °F, dew point 66 °F
- Altimeter: 29.00 inHg
- Observed at: CNU, 28 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 19860407012159A](https://openairdocs.org/incident/19860407012159A), Apr 7, 1986: Hiller UH12B, Fall River, KS, Destroyed. Struck trees trying to land in a open field. Student allowed rotor RPM to decay and descended into trees.

## Other investigations on N5307V (2)

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 MIA01LA085](https://openairdocs.org/ntsb/MIA01LA085), Feb 24, 2001: Hiller UH-12B (N5307V), Whitesburg, GA, substantial damage. Probable cause: The improper emergency procedure performed by the pilot due to his electing to perform a run-on landing resulting in excessive airspeed at touchdown and subsequent roll-over following ground contact…
- [NTSB FTW65A0128](https://openairdocs.org/ntsb/FTW65A0128), Jun 28, 1965: Hiller UH-12B (N5307V), Mer Rouge, LA, destroyed

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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