# NTSB FTW83IA053: Bell 412, N2258F, Intercoastal Ci, LA, December 2, 1982

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: December 2, 1982, 13:00 local (19:00 UTC)
- Place: Intercoastal Ci, LA
- Coordinates: 29.969644, -92.120964 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=29.9696&lon=-92.1210&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 2, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 71152
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW83IA053
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/71152/pdf
- Page: https://openairdocs.org/ntsb/FTW83IA053

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise - normal
  - rotor system,main rotor hub yoke(spindle) - fatigue (cause)

## Analysis

WHILE IN CRUISE FLIGHT, THE PILOTS HEARD A LOUD POP AND FELT A SEVERE CYCLIC CONTROL VIBRATION. AN IMMEDIATE PRECAUTIONARY LANDING WAS MADE. AN EXAMINATION REVEALED THAT THERE WAS A FATIGUE CRACK IN THE TRAILING EDGE OF THE BLUE, MAIN ROTOR YOKE FLEXURE, PN 412-010-101-113. THE HELICOPTER AND THE FIXTURE HAD ACCUMULATED 1071 HRS OF FLIGHT TIME. THE LIFE LIMIT OF THE FAILED COMPONENT WAS 5000 HRS.

## Aircraft

- Registration: [N2258F](https://openairdocs.org/deregistered/N2258F-2018-01-12), registration cancelled 2018-01-12, S/N 33073, built 1982 (OpenAirDocs)
- Reported make and model: BELL 412
- Registry model: [Bell 412](https://openairdocs.org/model/bell-412) (registry code 1182202) (OpenAirDocs)
- Registry engine: [Pratt & Whitney Canada PT6T-3 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6t-3-series) (registry code 52103, turbo-prop) (OpenAirDocs)
- Category: Helicopter
- Serial number: 33073
- Airframe hours: 1071
- Engines: P&W PT6T-3B 1350 horsepower turbo shaft
- Damage: No damage
- Fire: Unknown
- Flight: Part 91
- Operator: Petroleum Helicopters, Inc.
- Registered owner: Petroleum Helicopters, Inc.
- Departed: 0R3, ABBEVILLE, LA
- Destination: RNO, RENO, NV

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 33; airline transport; instrument ratings: helicopter; medical: class 1, valid medical--no waivers/lim.; flight hours: 6,820 total, 967 in this make and model, 3,901 as pilot in command, 12 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 15 knots
- Visibility: 7 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).

- [Incident 19821202070569I](https://openairdocs.org/incident/19821202070569I), Dec 2, 1982: Bell 412, Intracoastal Ci, LA. Loud noise and vibration. Made emergency landing, found main rotor yoke flex plate had cracked. AD on item not due.

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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