# NTSB CHI85IA369: Fokker F27-500, N242MA, Chicago, IL, September 9, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: September 9, 1985, 08:20 local (13:20 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: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 32 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12921
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI85IA369
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12921/pdf
- Page: https://openairdocs.org/ntsb/CHI85IA369

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - roll/run
  - compressor assembly,impeller - failure,total (cause)
  - compressor assembly,impeller - fatigue (cause)

## Analysis

AT ABOUT THE TIME FULL POWER WAS OBTAINED THE HEARD A LOUD BANG FOLLOWED BY A FIRE WARNING FOR THE LEFT ENGINE. THE TAKEOFF WAS ABORTED AND THE CREW SHUT DOWN THE ENGINE. THE PASSENGERS WERE DEPLANED ON THE TAXIWAY AFTER IT WAS DETERMINED THE FIRE WAS OUT & THERE WAS NO MORE DANGER. EXAMINATION OF THE ENGINE REVEALED THAT THE LOW PRESSURE IMPELLER FAILED IN A HIGH CYCLE FATIGUE MODE.

## Aircraft

- Registration: N242MA (not matched to a registry record)
- Reported make and model: FOKKER F27-500
- Category: Airplane
- Serial number: 10678
- Engines: ROLLS-ROYCE DART 535-7R 2250 horsepower turbo prop
- Damage: Minor damage
- Fire: On-Ground
- Flight: Part 121
- Operator: Midstate Airlines, Inc.
- Registered owner: Whirlpool Leasing Serv., Inc
- Airworthiness certificate: Standard, Transport
- Departed: ORD, CHICAGO, IL
- Destination: CWA, MOSINEE, WI
- Flight plan: IFR
- Airport: ORD, O'Hara Iap, runway 14, 10,003 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 17,810 total, 910 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 8 knots
- Visibility: 5 statute miles
- Lowest ceiling: 1,100 ft overcast
- Temperature: 75 °F, dew point 66 °F
- Observed at: ORD

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19850909049449I](https://openairdocs.org/incident/19850909049449I), Sep 9, 1985: Fokker F27MK500, Chicago, IL, Minor damage. Loud explosion on takeoff roll. Aborted takeoff. Uncontained failure of low pressure impeller.

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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