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NTSB Report
November 22, 1988 · Cessna A185F · N20752
Deadhorse, AK
Overview
Report Status
Preliminary report
Event Type
Incident
Date
November 22, 1988
Injury Outcomes
No injuries (1 uninjured)
Location
Deadhorse, AK
Aircraft
Cessna A185F
Tail Number
N20752
Operator
Cape Smythe Air Service
Injuries
None
NTSB Number
ANC89IA019
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time13:55 AKST
Nearest AirportDeadhorse (0nm N)
Runway22
Runway Length6500 ft
Runway Width150 ft
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna A185F
Tail NumberN20752
Aircraft CategoryAir
OperatorCape Smythe Air Service
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-520 · Reciprocating · 300
Seats6
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 37 · First Class
Conditions
ConditionsVMC
LightBright Night
Wind230° @ 5 kt
Visibility7 sm
CeilingNone
Temperature / Dew Point12 C / 16 C
Altimeter29.00 inHg
Observation Time22:45
Weather SourceWFAC