# NTSB CHI90IA084: Short Brothers SD3-60, N361MQ, Chicago, IL, February 19, 1990

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: February 19, 1990, 15:30 local (21:30 UTC)
- Place: Chicago, IL
- Location: 41.9769° N, 87.9081° W: Placed by OpenAirDocs at CHICAGO O'HARE INTL (ORD), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.9769&lon=-87.9081&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 16 uninjured
- Status: Completed, report December 30, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 14564
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI90IA084
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14564/pdf
- Page: https://openairdocs.org/ntsb/CHI90IA084

## Probable cause

FATIGUE FAILURE OF A FIRST STAGE POWER TURBINE BLADE.

## 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, approach - faf/outer marker to threshold (ifr)
  - 1 engine
  - turbine assembly,turbine blade - failure,total (cause)
  - turbine assembly,turbine blade - fatigue (cause)

## Analysis

THE AIRCRAFT WAS ON FINAL FOR LANDING AT O'HARE INTERNATIONAL AIRPORT. OVER THE LANDING THRESHOLD THE PILOT REPORTED THAT HE HEARD A SERIES OF SMALL POPS AND A LOUD POP FROM THE NUMBER 1 ENGINE FOLLOWED BY A TORQUE DECAY. THE ENGINE WAS FEATHERED ON TOUCHDOWN. THE INVESTIGATION REVEALED A FATIGUE FAILURE OF A TURBINE BLADE IN THE FIRST STAGE POWER TURBINE.

## Aircraft

- Registration: [N361MQ](https://openairdocs.org/deregistered/N361MQ-1996-06-20), registration cancelled 1996-06-20, S/N SH3607 (OpenAirDocs)
- Reported make and model: SHORT BROTHERS SD3-60
- Registry model: [Short Bros SHORTS SD3-60](https://openairdocs.org/model/short-bros-shorts-sd3-60) (registry code 8100605) (OpenAirDocs)
- Category: Airplane
- Serial number: SH3607
- Engines: P&W PT6A-65AR 1375 horsepower turbo prop
- Damage: Minor damage
- Flight: Part 121
- Registered owner: Simmons Airlines
- Last inspection: Continuous airworthiness, November 27, 1988, 2,267 hours before
- Departed: CMI, CHAMPAIGN, IL
- Flight plan: IFR
- Airport: ORD, Chicago O'Hare, runway 27, 10,141 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: unknown, unknown

## Weather

- Conditions: Visual (VMC), Day
- Wind: 310° at 12 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 28 °F, dew point 10 °F
- Altimeter: 30.00 inHg
- Observed at: ORD

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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