# NTSB MIA85LA083: Bell 206L-1, N5736K, Loiza, PR, January 18, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 18, 1985, 16:00 local (20:00 UTC)
- Place: Loiza, PR
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 31345
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA85LA083
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31345/pdf
- Page: https://openairdocs.org/ntsb/MIA85LA083

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, takeoff - initial climb
  - compressor assembly,casting - fatigue (cause)
  - maintenance,inspection - inadequate, company maintenance personnel (contributing factor)
- Forced landing, maneuvering - turn to landing area (emergency)
- In flight collision with object, maneuvering - turn to landing area (emergency)
  - object - fence (contributing factor)
- Roll over, landing

## Analysis

THE HELICOPTER PLT HAD JUST DISCHARGED HIS PASSENGERS FOLLOWING A FLT FROM AN OFF-SHORE BARGE TO A BEACH HELIPORT. WHEN HE LIFTED OFF & STARTED TO CROSS OVER A FENCE, THE ENG LOST PARTIAL POWER. THE PLT TRIED TO AVOID THE OBSTRUCTION, BUT THE TAIL BOOM HIT THE FENCE & FAILED. THE ACFT THEN HIT THE GROUND & ROLLED OVER. AN ENG TEARDOWN REVEALED THAT THE COMPRESSOR MOUNT ASSEMBLY, P/N 6898611, HAD FAILED FROM FATIGUE AT 3 PAD POSITIONS. THERE WAS EVIDENCE THAT THE COMPRESSOR SPLINE ADAPTER THEN FAILED DUE TO MISALIGNMENT. A REVIEW OF THE MAINTENANCE RECORDS SHOWED THAT A MANDATORY INSPECTION OF THE COMPRESSOR MOUNTS WAS OVERDUE.

## Aircraft

- Registration: N5736K (not matched to a registry record)
- Reported make and model: BELL 206L-1
- Category: Helicopter
- Serial number: 45423
- Airframe hours: 21127
- Engines: ALLISON 250-C28B 435 horsepower turbo shaft
- Damage: Substantial damage
- Flight: Part 135
- Registered owner: Omni Flight Offshore
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, November 30, 1984, 871 hours before
- Airport: Beach Heliport

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; instrument ratings: helicopter; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 3,604 total, 861 in this make and model, 3,403 as pilot in command, 173 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 80° at 11 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 81 °F, dew point 66 °F
- Altimeter: 29.00 inHg
- Observed at: SJU, 12 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 19850118005139A](https://openairdocs.org/incident/19850118005139A), Jan 18, 1985: Bell 206L1, Loiza, Puerto Rico, Substantial damage. Lost power on hover after lift off swung around tail hit fence helicopter rolled over. Compressor mount had failed

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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