# NTSB CHI87FA191: Beech B90, N425K, Milwaukee, WI, August 9, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Field investigation · Final report
- Date: August 9, 1987, 13:40 local (18:40 UTC)
- Place: Milwaukee, WI
- Coordinates: 42.980621, -87.899276 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.9806&lon=-87.8993&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report December 27, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 13653
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI87FA191
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13653/pdf
- Page: https://openairdocs.org/ntsb/CHI87FA191

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - initial climb
  - air cond/heating/pressurization,turbocompressor - fire (cause)
  - maintenance,inspection - inadequate, company maintenance personnel (contributing factor)
- Fire, takeoff - initial climb

## Analysis

ON DEPARTURE THE CREW IDENTIFIED AN IN FLIGHT FIRE. AN IMMEDIATE SHUTDOWN OF ELECTRICAL, ENVIRONMENTAL AND PRESSURIZATION SYSTEMS WAS INITIATED AND A RETURN WAS MADE TO THE AIRPORT WITH A SUCCESSFUL LANDING. THE FIRE WAS DISCOVERED TO HAVE OCCURRED IN THE AREA OF THE PRESSURIZATION SUPERCHARGER AND HAD SUBSTANTIALLY DAMAGED THE AIRCRAFT. THE CREW AND TWO PASSENGERS EVACUATED SUCCESSFULLY WITHOUT INJURY. THE SUPERCHARGER HOSE COLLAPSED FROM DETERIORATION. OIL SPILLAGE DURING SERVICING CONTAMINATED THE HOSE.

## Aircraft

- Registration: [N425K](https://openairdocs.org/deregistered/N425K-2004-01-16), registration cancelled 2004-01-16, S/N LJ-318, built 1967 (OpenAirDocs)
- Reported make and model: BEECH B90
- Registry model: [Beech B90](https://openairdocs.org/model/beech-b90) (registry code 1152912) (OpenAirDocs)
- Registry engine: [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series) (registry code 52032, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: LJ-318
- Airframe hours: 8456
- Engines: P&W PT6A-20 550 horsepower turbo prop
- Damage: Substantial damage
- Fire: In-Flight
- Flight: Part 135
- Registered owner: Scott Air Chartered, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, July 7, 1987
- Departed: MKE
- Destination: LNL, LAND O'LAKES, WI
- Flight plan: IFR
- Airport: MKE, General Mitchell, runway 1L, 9,690 × 200 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; airline transport, flight instructor; airplane ratings: multi-engine land, single-engine land; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 4,335 total, 60 in this make and model, 3,784 as pilot in command, 160 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 14 knots
- Visibility: 6 statute miles
- Lowest ceiling: 1,400 ft overcast
- Temperature: 72 °F, dew point 64 °F
- Altimeter: 29.00 inHg
- Observed at: MKE

## 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 19870809050529A](https://openairdocs.org/incident/19870809050529A), Aug 9, 1987: Beech B90, Milwaukee, WI, Substantial damage. Smoke in cabin after takeoff. Shut down system and returned. Fire in pressurization supercharger from failed hose.

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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