# NTSB NYC91IA137: Boeing 727-214, N750UA, Boston, MA, June 6, 1991

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: June 6, 1991, 16:39 local (20:39 UTC)
- Place: Boston, MA
- Location: 42.3629° N, 71.0064° W: Placed by OpenAirDocs at GENERAL EDWARD LAWRENCE LOGAN INTL (BOS), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.3629&lon=-71.0064&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 156 uninjured
- Status: Completed, report May 3, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 36815
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC91IA137
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/36815/pdf
- Page: https://openairdocs.org/ntsb/NYC91IA137

## Probable cause

THE FAILURE OF THE THIRD STAGE TURBINE BLADE ON THE NUMBER TWO ENGINE, DUE TO HIGH CYCLE FATIGUE.

## 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 - roll/run
  - 1 engine - failure,total (cause)
  - turbine assembly,turbine blade - fatigue (cause)

## Analysis

JUST AFTER TAKEOFF, THE PILOT SAID, 'A LOUD NOISE WAS HEARD ACCOMPANIED BY HIGH EGT ON THE NUMBER 2 ENGINE.'  THE CREW SHUT DOWN THE ENGINE AND LANDED WITHOUT INCIDENT.  AN EXAMINATION OF THE ENGINE REVEALED AN UNCONTAINED ENGINE FAILURE.  DAMAGE TO THE AIRPLANE WAS MINOR.  A THIRD STAGE TURBINE BLADE FAILED DUE TO HIGH CYCLE FATIGUE ON THE LEADING EDGE OF THE BLADE.

## Aircraft

- Registration: [N750UA](https://openairdocs.org/deregistered/N750UA-1992-06-26), registration cancelled 1992-06-26, S/N 19319 (OpenAirDocs)
- Reported make and model: BOEING 727-214
- Registry model: [Boeing 727-44C](https://openairdocs.org/model/boeing-727-44c) (registry code 138404J) (OpenAirDocs)
- Category: Airplane
- Serial number: 709108
- Engines: P&W JT8D-15A 15100 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Part 121
- Operator: Usair
- Registered owner: Usair
- Airworthiness certificate: Standard, Transport
- Last inspection: Unknown, January 2, 2000
- Destination: CLT, CHARLOTTE, NC
- Flight plan: IFR
- Airport: BOS, Logan International, runway 9, 9,000 × 150 ft

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; airline transport, commercial, private; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; flight hours: 12,500 total, 5,500 in this make and model, 8,000 as pilot in command, 180 in the last 90 days, 65 in the last 30 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none

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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