# NTSB CHI85FEV04: Hiller UH-12D, N67182, Breese, IL, September 24, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: September 24, 1985, 07:15 local (12:15 UTC)
- Place: Breese, IL
- Coordinates: 38.609626, -89.519531 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.6096&lon=-89.5195&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12898
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI85FEV04
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12898/pdf
- Page: https://openairdocs.org/ntsb/CHI85FEV04

## 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, cruise
  - engine assembly,piston - failure,partial (cause)
  - engine assembly,piston - overtemperature
  - engine assembly,valve,intake - binding(mechanical)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing - flare/touchdown

## Analysis

THE PLT REPORTED THAT THE ENG BEGAN LOSING POWER WHILE HE WAS EN ROUTE AT AN ALT OF APRX 200 FT AGL. HE TURNED & INITIATED AN AUTOROTATION TO A ROAD CONSTRUCTION SITE. THE HELICOPTER LANDED TAIL LOW. SUBSEQUENTLY, THE TAIL BOOM WAS CHOPPED OFF & THE HELICOPTER BOUNCED & ROTATED 180 DEG. AN EXAM OF THE ENG REVEALED THE #4 PISTON HAD FAILED. THE PISTON HAD BURNT & MOLTEN ALUMINUM HAD TRANSFERRED TO THE STEM OF THE EXHAUST VALVE CAUSING IT TO STICK OPEN.

## Aircraft

- Registration: [N67182](https://openairdocs.org/deregistered/N67182-2013-09-16), registration cancelled 2013-09-16, S/N 1160, built 1960 (OpenAirDocs)
- Reported make and model: HILLER UH-12D
- Registry model: [Hiller-Northern UH-12D](https://openairdocs.org/model/hiller-northern-uh-12d) (registry code 4361301) (OpenAirDocs)
- Registry engine: [Lycoming VO-435 series](https://openairdocs.org/engine/lycoming-vo-435-series) (registry code 41525, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 1160
- Airframe hours: 9118
- Engines: LYCOMING VO-435-A1C 260 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Dennis M. Meier
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, August 15, 1985, 4 hours before
- Departed: BREESE, IL

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; commercial; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 5,948 total, 800 in this make and model, 5,703 as pilot in command, 110 in the last 90 days, 5 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 4 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 45 °F, dew point -0 °F
- Altimeter: 30.00 inHg
- Observed at: STL, 43 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 19850924047079A](https://openairdocs.org/incident/19850924047079A), Sep 24, 1985: Hiller UH12D, Breese, IL, Substantial damage. Lost power en route to aerial application site. Landed tail low and bounced. Exhaust valve stuck, piston failed.

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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