# NTSB SEA84LA021: Enstrom F28F, N8622U, Hillsboro, OR, November 15, 1983

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: November 15, 1983, 08:35 local (16:35 UTC)
- Place: Hillsboro, OR
- Coordinates: 45.57973, -122.910354 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.5797&lon=-122.9104&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 39851
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA84LA021
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39851/pdf
- Page: https://openairdocs.org/ntsb/SEA84LA021

## Analysis

THE ACFT DID A HARD LANDING DURING AUTOROTATION AFTER THE ENGINE RAN ROUGH AND QUIT AT 250 FT AGL DURING TAKEOFF. THE PILOT HAD LEANED THE MIXTURE, HE SAID, PRIOR TO TAKEOFF AND HE WAS NOT SURE IF HE PUSHED THE MIXTURE TO FULL RICH WHEN THE ENGINE STARTED TO MISS AND RUN ROUGH. DURING AUTOROTATION HE MAINTAINED 50 MPH WITH LITTLE FLARE FOR LANDING. THE ENGINE WAS CHECKED AFTER THE ACCIDENT AND OPERATED NORMALLY. THE MIXTURE WAS SLOWLY TURNED TO SEE HOW IT WOULD BE WHEN THE ENGINE RAN ROUGH. IT WAS ABOUT 3 INCHES FROM FULL RICH.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, takeoff - initial climb
  - mixture - improper, pilot in command (cause)
- Forced landing, landing - flare/touchdown
  - autorotation - performed, pilot in command (contributing factor)
- Hard landing, landing - flare/touchdown

## Aircraft

- Registration: [N8622U](https://openairdocs.org/aircraft/N8622U), registered now, S/N 721, built 1982 (OpenAirDocs)
- Reported make and model: ENSTROM F28F
- Registry model: [Enstrom F-28F](https://openairdocs.org/model/enstrom-f-28f) (registry code 3300412) (OpenAirDocs)
- Registry engine: [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series) (registry code 41524, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 721
- Airframe hours: 145
- Engines: LYCOMING HIO-360-F1AD 225 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: John Bruce Kiessling
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, October 4, 1983, 45 hours before
- Departed: HIO, HILLSBORO, OR
- Destination: U42, SALT LAKE CITY, UT

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; private; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 307 total, 71 in this make and model, 165 as pilot in command, 51 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 110° at 9 knots
- Visibility: 20 statute miles
- Lowest ceiling: 5,500 ft broken
- Altimeter: 29.00 inHg
- Observed at: PDX, 15 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 19831115057649A](https://openairdocs.org/incident/19831115057649A), Nov 15, 1983: Enstrm F28F, Hillsboro, OR, Substantial damage. Helicopter engine lost power on climb after takeoff. Crash occurred during autorotation landing.

## Other investigations on N8622U (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC98LA109](https://openairdocs.org/ntsb/ANC98LA109), Jul 25, 1998: Enstrom F-28F (N8622U), Skwentna, AK, substantial damage. Probable cause: A loss of engine power due to a fractured number three cylinder intake manifold flange, and the pilot's inability to maintain the proper rate of descent during the autorotation flare. A contributing…

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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