NTSB Identification: SEA82IA170
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Incident occurred Wednesday, September 22, 1982 in CASHMERE, WA
Probable Cause Approval Date: 09/22/1983
Aircraft: CESSNA 177RG, registration: N52716
Injuries: 2 Uninjured.

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

WHILE DESCENDING THROUGH 7500 FT THE PILOT OBSERVED SMOKE ENTERING THE COCKPIT FROM THE INSTRUMENT PANEL AREA. AN ATTEMPT WAS MADE TO ISOLATE THE SOURCE BY SHUTTING OFF VARIOUS ELECTRICAL COMPONENTS. THE SMOKE CONTINUED TO APPEAR INTERMITTENTLY BEFORE THE AIRCRAFT REACHED ITS INTENDED DESTINATION. LATER INVESTIGATION REVEALED THAT A SLIGHT OIL LEAK ALLOWED OIL TO DROP ONTO A HEATED EXHAUST SHROUD AND PRODUCE SMOKE WHICH WAS INGESTED INTO THE COCKPIT THROUGH A DEFROSTER VENT UNDER CERTAIN CONDITIONS. THE OIL LEAK WAS FROM THE LEFT REAR ROCKER COVER.

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

LUBRICATING SYSTEM..LEAK

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