NTSB Incident Report on the Cessna A185F at Deadhorse, AK (ANC89IA019)

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NTSB Identification: ANC89IA019

For details, refer to NTSB microfiche number 37657A

Nonscheduled 14 CFR 135 operation of CAPE SMYTHE AIR SERVICE
Incident occurred NOV-22-88 at DEADHORSE, AK
Aircraft: CESSNA A185F, registration: N20752
Injuries: 1 Uninjured.

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.

Probable Cause

Exhaust system,muffler..Cracked
Exhaust system,muffler..Leak
Physical impairment(carbon monoxide)..Pilot in command

Contributing Factors

Maintenance, 100-hour inspection..Poor..Company maintenance personnel
Maintenance,replacement..Improper..Company maintenance personnel