# NTSB CHI91LA086: Beech 200, N5584M, Indianapolis, IN, February 1, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 1, 1991, 00:13 local (05:13 UTC)
- Place: Indianapolis, IN
- Coordinates: 39.729373, -86.290603 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7294&lon=-86.2906&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 4, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 15004
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91LA086
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15004/pdf
- Page: https://openairdocs.org/ntsb/CHI91LA086

## Probable cause

SEPARATION OF THE AFT, UPPER, ACCESSORY CASE COWL ASSEMBLY FROM THE AIRPLANE, AND INADEQUATE AIRFRAME EQUIPMENT PROVIDED BY THE MANUFACTURER.

## Sequence of events

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

- Airframe/component/system failure/malfunction, descent - normal
  - cooling system,cowling - separation (cause)
  - acft/equip,inadequate airframe, manufacturer (cause)
- Decompression, descent - normal
  - fuselage - penetrated

## Analysis

THE TWIN-ENGINED TURBO-PROP AIRPLANE WAS DESCENDING FROM 20,000 FEET MSL TO 7,000 FEET MSL WHEN THE LEFT ENGINE AFT, UPPER ACCESSORY CASE COWL SEPARATED FROM ITS MOUNT.  THE COWL ASSEMLBY STRUCK THE LEFT SIDE OF THE FUSELAGE, THE VERTICAL STABILIZER, AND THE HORIZONTAL STABILIZER.  THE FUSELAGE STRIKE CAUSED A RAPID DECOMPRESSION.  THE AIRPLANE WAS LANDED WITHOUT FURTHER INCIDENT.

## Aircraft

- Registration: N5584M (not matched to a registry record)
- Reported make and model: BEECH 200
- Category: Airplane
- Serial number: BB1368
- Engines: P&W PT6A-42 850 horsepower turbo prop
- Damage: Substantial damage
- Flight: Business, Part 91
- Registered owner: Beechcraft East
- Departed: BDL, WINDSOR LOCKS, CT
- Destination: IND
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 33; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 1,900 total, 100 in this make and model

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: 180° at 7 knots
- Visibility: 25 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F
- Observed at: IND, 30 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 19910201001429A](https://openairdocs.org/incident/19910201001429A), Feb 1, 1991: Beech B200, Indianapolis, IN, Substantial damage. Left rear engine cowling access door tore off in flight damaging fuselage and empennage. In moderate turbulence.

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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