NTSB Identification: CHI87FA191.
The docket is stored on NTSB microfiche number 35283.
Nonscheduled 14 CFR
Accident occurred Sunday, August 09, 1987 in MILWAUKEE, WI
Probable Cause Approval Date: 12/27/1988
Aircraft: BEECH B90, registration: N425K
Injuries: 4 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIR COND/HEATING/PRESSURIZATION,TURBOCOMPRESSOR..FIRE


Contributing Factors

MAINTENANCE,INSPECTION..INADEQUATE..COMPANY MAINTENANCE PERSONNEL

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