NTSB Identification: DEN85LA093.
The docket is stored on NTSB microfiche number 27596.
Accident occurred Thursday, February 28, 1985 in BUTTE, MT
Aircraft: CESSNA 421C, registration: N98487
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE IN LEVEL FLT THE PLT NOTICED A PUFF OF SMOKE EMIT FROM THE LEFT ENGINE, FOLLOWED BY THE APPEARANCE OF HYDRAULIC FLUID AND THE ILLUMINATION OF THE LEFT AND RIGHT HYDRAULIC FLOW LIGHTS. THE PLT LOWERED THE LANDING GEAR DURING THE APCH, HOWEVER, THE NOSE GEAR DID NOT EXTEND. FLAMES WERE THEN NOTICED BURNING THROUGH THE TOP OF THE LEFT ENGINE COWLING. THE PLT SECURED THE ENGINE, USED THE EMERGENCY EXTENSION FOR THE NOSE GEAR AND LANDED THE ACFT. INVESTIGATION REVEALED THE FIRE STARTED FROM HYDRAULIC FLUID WHICH SPRAYED FROM A BROKEN HYDRAULIC LINE ONTO THE SUPERCHARGER. A SWIVEL HOSE ALUMINUM FITTING, P/N AE70101JZ174, ON THE HYDRAULIC LINE FAILED FOR UNDETERMINED REASONS.

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

HYDRAULIC SYSTEM,FITTING..FAILURE,TOTAL

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