NTSB Identification: ANC89IA019.
The docket is stored on NTSB microfiche number 37657.
Nonscheduled 14 CFR
Incident occurred Tuesday, November 22, 1988 in DEADHORSE, AK
Probable Cause Approval Date: 01/25/1990
Aircraft: CESSNA A185F, registration: N20752
Injuries: 1 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.

ACFT BOUNCED SEVERAL TIMES DURING LANDING. THE PILOT COLLAPSED SHORTLY AFTER GETTING OUT OF THE AIRPLANE. BLOOD SAMPLES, TAKEN FROM THE PILOT THREE HOURS AFTER LANDING, CONTAINED 22.1% CARBON MONOXIDE. THE LEFT ENGINE MUFFLER OVERBOARD TUBE WAS BROKEN LOOSE FROM THE MUFFLER, WHERE THE TWO ARE WELDED, ALLOWING EXHAUST GAS TO ENTER THE COCKPIT THROUGH THE HEATER SYSTEM. THE OVERBOARD TUBE HAD A .022 INCH DEEP GROOVE FROM RUBBING AGAINST THE ENGINE COWLING, ON THE SIDE WHERE THE CRACK ORIGINATED. THE MUFFLER HAD BEEN INSTALLED DURING THE LAST 100 HOUR INSPECTION, 68 HOURS PREVIOUSLY. THE SOURCE OF MANUFACTURER OF THE MUFFLER COULD NOT BE VERIFIED.

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

EXHAUST SYSTEM,MUFFLER..CRACKED

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

PHYSICAL IMPAIRMENT(CARBON MONOXIDE)..PILOT IN COMMAND

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

EXHAUST SYSTEM,MUFFLER..LEAK


Contributing Factors

MAINTENANCE,100-HOUR INSPECTION..POOR..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

MAINTENANCE,REPLACEMENT..IMPROPER..COMPANY MAINTENANCE PERSONNEL

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