NTSB Identification: ANC89IA019
For details, refer to NTSB microfiche number 37657A
Nonscheduled 14 CFR 135 operation of CAPE SMYTHE AIR SERVICE
Incidentoccurred 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 GETTINGOUT 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 LOOSEFROM THE MUFFLER, WHERE THE TWO ARE WELDED, ALLOWING EXHAUST GAS TO ENTER THE COCKPITTHROUGH THE HEATER SYSTEM. THE OVERBOARD TUBE HAD A .022 INCH DEEP GROOVE FROM RUBBINGAGAINST THE ENGINE COWLING, ON THE SIDE WHERE THE CRACK ORIGINATED. THE MUFFLER HAD BEENINSTALLED DURING THE LAST 100 HOUR INSPECTION, 68 HOURS PREVIOUSLY. THE SOURCE OFMANUFACTURER 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
