# NTSB MIA86LA138: Bell UH-1B, N4242T, North Port, FL, April 14, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 14, 1986, 08:15 local (13:15 UTC)
- Place: North Port, FL
- Location: 27.0442° N, 82.2359° W: Placed by OpenAirDocs: center of North Port, FL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=27.0442&lon=-82.2359&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 31616
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA86LA138
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31616/pdf
- Page: https://openairdocs.org/ntsb/MIA86LA138

## 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, takeoff - initial climb
  - turbine assembly,turbine blade - fatigue (cause)
  - turbine assembly,turbine blade - failure,total (cause)
- Hard landing, landing - flare/touchdown

## Analysis

THE FLT EXPERIENCED AN ENG FAILURE AT AN ALT OF APRX 8 FT AGL SHORTLY AFTER TAKEOFF AND THE HELICOPTER SUSTAINED SUBSTANTIAL DAMAGE WHEN A HARD LANDING WAS MADE. POST ACCIDENT INSPECTION OF THE ENG REVEALED THE PWR TURBINE WHEEL EXPERIENCED A LOSS OF TWO TURBINE BLADES WHICH IN TURN CAUSED THE TURBINE SECTION OF THE ENG TO SEIZE, SHEARING THE DRIVE SHAFT TO THE COMPRESSOR SECTION OF THE ENG. THE FAILURE POINT OF THE TWO TURBINE BLADES REVEALED BURNING WHICH IS EVIDENT OF PRE-EXISTING CRACKS.

## Aircraft

- Registration: [N4242T](https://openairdocs.org/deregistered/N4242T-1993-09-17), registration cancelled 1993-09-17, S/N 621906 (OpenAirDocs)
- Reported make and model: BELL UH-1B
- Registry model: [Bell UH-1B](https://openairdocs.org/model/bell-uh-1b) (registry code 1181410) (OpenAirDocs)
- Category: Helicopter
- Serial number: 62-1906
- Airframe hours: 8504
- Engines: LYCOMING T-53-L-1A 860 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Colony Helicopters
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, November 1, 1985, 7 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; commercial; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 11,988 total, 1,941 in this make and model, 11,709 as pilot in command, 69 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 50° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 61 °F
- Altimeter: 29.00 inHg
- Observed at: RSW, 45 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 19860414015329A](https://openairdocs.org/incident/19860414015329A), Apr 14, 1986: Bell UH1B, North Port, FL, Substantial damage. Engine failed shortly after takeoff and crash occurred during auto rotation landing.

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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