# NTSB CHI82DA301: Hiller 12E, N5594N, Palisade, MN, August 10, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 10, 1982, 08:00 local (13:00 UTC)
- Place: Palisade, MN
- Location: 46.7127° N, 93.4893° W: Placed by OpenAirDocs: center of Palisade, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.7127&lon=-93.4893&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 10, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72141
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI82DA301
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72141/pdf
- Page: https://openairdocs.org/ntsb/CHI82DA301

## 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, maneuvering - aerial application
  - engine assembly,connecting rod - undertorqued (cause)
  - maintenance,overhaul - inadequate, other maintenance personnel (cause)
  - engine assembly,connecting rod - failure,total (cause)
- Forced landing, landing - flare/touchdown
  - autorotation - initiated, pilot in command
- Roll over, landing - flare/touchdown
  - landing gear,skid assembly - overload
  - landing gear,skid assembly - failure,total

## Analysis

AIRCRAFT LOST POWER, PILOT AUTOROTATED AT 20 FEET AGL. MADE HARD FORCED LANDING AND AIRCRAFT ROLLED OVER. PISTON ROD FAILED BECAUSE CAP BOLT WAS UNDERTORQUED.

## Aircraft

- Registration: [N5594N](https://openairdocs.org/deregistered/N5594N-1989-07-27), registration cancelled 1989-07-27, S/N 1453 (OpenAirDocs)
- Reported make and model: HILLER 12E
- Registry model: [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e) (registry code 4360122) (OpenAirDocs)
- Category: Helicopter
- Serial number: 1453
- Airframe hours: 4014
- Engines: LYCOMING VO-540-C2A 305 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Dagnon Aviation
- Registered owner: Dagnon Aviation
- Departed: PALISADE, MN
- Destination: PALISADE, MN

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 22; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; flight hours: 675 total, 195 in this make and model, 417 as pilot in command, 190 in the last 90 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 360° at 3 knots
- Visibility: 20 statute miles

## 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 19820810036689A](https://openairdocs.org/incident/19820810036689A), Aug 10, 1982: Hiller UH12E, Palisade, MN, Substantial damage. Engine quit during spray run. Hard landing chopped off tail boom. Broken connecting rod found to be under torqued.

## Other investigations on N5594N (3)

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 DEN89DTM02](https://openairdocs.org/ntsb/DEN89DTM02), May 13, 1989: Hiller UH-12E (N5594N), Mack, CO, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN PROPER ALTITUDE DURING A SWATH RUN.
- [NTSB CHI81FER59](https://openairdocs.org/ntsb/CHI81FER59), Jul 20, 1981: Hiller Acft UH-12E (N5594N), Glyndon, MN, substantial damage
- [NTSB DEN81FTG01](https://openairdocs.org/ntsb/DEN81FTG01), Oct 3, 1980: Hiller UH12E (N5594N), Argusville, ND, substantial damage

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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