# Accident 19930923036609A: Bell UH1B, Pierce, ID, September 23, 1993

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: September 23, 1993, 08:15 local time
- Place: Pierce, ID
- Damage: Substantial damage
- Phase of flight: Prw On Run Landing (Rotorcraft
- Operating rules: Rotorcraft external load (Part 133)
- Operator: YWQL
- Location: 46.1604° N, 116.9201° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=46.1604&lon=-116.9201&mi=10
- Aircraft: N3979C, a cancelled registration (https://openairdocs.org/deregistered/N3979C-2014-12-02) (OpenAirDocs)
- Registry model: Bell UH-1B (registry code 1181410, https://openairdocs.org/model/bell-uh-1b) (OpenAirDocs)
- Registry engine: Lycoming T-53 series (registry code 41549, https://openairdocs.org/engine/lycoming-t-53-series) (OpenAirDocs)
- Reported make and model: BELL UH1B
- Reported engine: LYC T53L11D
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 22,000 total, 200 in the last 90 days
- NTSB investigation: [NTSB SEA93LA207](https://openairdocs.org/ntsb/SEA93LA207) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19930923036609A

## Narrative

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

90 DEGREE GEAR BOX SEPARATED FROM HELICOPTER. LANDED HARD DURING RUN ON LANDING. CHOPPED TAIL. ATTACH BOLTS BROKE.

## 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 SEA93LA207](https://openairdocs.org/ntsb/SEA93LA207), Sep 23, 1993: Bell UH-1B (N3979C), Pierce, ID, substantial damage. Probable cause: SEPARATION OF THE 90 DEGREE GEARBOX AFTER FATIGUE FAILURE OF THE GEARBOX ATTACH BOLTS. FACTORS INCLUDE HILLY/MOUNTAINOUS TERRAIN.

## Other reports on N3979C (1)

Matched to the same aircraft by N-number and date.

- [Incident 19860412021889I](https://openairdocs.org/incident/19860412021889I), Apr 12, 1986: Bell UH1B (N3979C), Turlock, CA, Minor damage. Following spray run aircraft lost RPM. Damage to cross tube and rotor. Hot section had failed.

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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