# Accident 19930924036309A: Bell UH1B, Detroit Lake, OR, September 24, 1993

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: September 24, 1993, 10:50 local time
- Place: Detroit Lake, OR
- Damage: Substantial damage
- Phase of flight: Pwr Off Run Land (Autorotation
- Operating rules: Rotorcraft external load (Part 133)
- Operator: WYFL
- Location: 44.7394° N, 121.8809° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=44.7394&lon=-121.8809&mi=10
- Aircraft: N70NW (not matched to a registry record)
- Reported make and model: BELL UH1B
- Reported engine: LYC T53L11D
- Fatal injuries: 0
- Pilot flight hours: 6,800 total, 1,241 in this make and model, 50 in the last 90 days
- NTSB investigation: [NTSB SEA93LA213](https://openairdocs.org/ntsb/SEA93LA213) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19930924036309A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

LOUD NOISE. DROPPED LOGS MADE AUTOROTATION. STRUCK TREE. TEN BLADES BROKE ON AIRFOIL SECTION TURBINE.BEARING ALSO.

## The NTSB's investigation of this event (1)

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 SEA93LA213](https://openairdocs.org/ntsb/SEA93LA213), Sep 24, 1993: Bell UH-1B (N70NW), Detroit Lake, OR, substantial damage. Probable cause: FAILURE OF A SECOND STAGE TURBINE WHEEL TOO LOW FOR A SUCCESSFUL AUTOROTATION. FACTORS INCLUDE A TREE IN THE APPROACH PATH.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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