# NTSB FTW84LA414: Bell 206L-1, N5013F, West Delta 105, September 26, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 26, 1984, 11:57 local (16:57 UTC)
- Place: West Delta 105
- Phase of flight: [Emergency descent](https://openairdocs.org/ntsb-phases/600) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21482
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW84LA414
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21482/pdf
- Page: https://openairdocs.org/ntsb/FTW84LA414

## 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, descent - emergency
  - turbine assembly,shaft - failure,total (cause)
- Forced landing, descent - emergency
- Roll over, landing
  - landing gear,float assembly - pressure too low (cause)

## Analysis

WHILE IN CRUISE FLT, TOTAL PWR LOSS WAS EXPERIENCED. PLT SETUP AUTOROTATIVE WATER LANDING, DEPLOYED EMERGENCY FLOATS. RIGHT FLOAT WAS NOT FULLY INFLATED BY WATER TOUCHDOWN, ACFT ROLLED RIGHT TO INVERTED POSITION. ENG TEARDOWN REVEALED CARBON BUILDUP BETWEEN TURBINE-TO-COMPRESSOR COUPLING AND TURBINE INNER SHAFT, CAUSING FRICTIONAL OVERHEAT LEADING TO SHAFT FAILURE.

## Aircraft

- Registration: [N5013F](https://openairdocs.org/deregistered/N5013F-2017-06-29), registration cancelled 2017-06-29, S/N 45205, built 1979 (OpenAirDocs)
- Reported make and model: BELL 206L-1
- Registry model: [Bell Helicopter Textron 206L-1](https://openairdocs.org/model/bell-helicopter-textron-206l-1) (registry code 1182107) (OpenAirDocs)
- Registry engine: [Allison 250 SER 250HP](https://openairdocs.org/engine/allison-250-ser-250hp) (registry code 03002, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Serial number: 45205
- Airframe hours: 3373
- Engines: ALLISON 250-C28B 435 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Part 135
- Operator: Commercial Helicopters, doing business as Commercial Helicopters
- Registered owner: Betty L. Foster
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, September 5, 1984, 73 hours before
- Departed: PATTERSON, LA
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 59; commercial; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane, helicopter; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 13,525 total, 850 in this make and model, 10,154 as pilot in command, 217 in the last 90 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 40° at 10 knots, gusting 12
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 82 °F

## 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 19840926058549A](https://openairdocs.org/incident/19840926058549A), Sep 26, 1984: Bell 206L1, West Delta, LA, Substantial damage. Carbon buildup in turbine to compressor coupling, failed coupling. Floats extended too late. Rolled over in water.

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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