# NTSB ANC89IA019: Cessna A185F, N20752, Deadhorse, AK, November 22, 1988 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: November 22, 1988, 18:55 local (22:55 UTC) - Place: Deadhorse, AK - Coordinates: 70.430297, -149.290817 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=70.4303&lon=-149.2908&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report January 25, 1990 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 5125 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC89IA019 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5125/pdf - Page: https://openairdocs.org/ntsb/ANC89IA019 ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Miscellaneous/other, cruise - normal - exhaust system,muffler - cracked (cause) - maintenance,100-hour inspection - poor, company maintenance personnel (contributing factor) - exhaust system,muffler - leak (cause) - maintenance,replacement - improper, company maintenance personnel (contributing factor) - Hard landing, landing - flare/touchdown - physical impairment(carbon monoxide), pilot in command (cause) ## Analysis 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. ## Aircraft - Registration: [N20752](https://openairdocs.org/aircraft/N20752), registered now, S/N 18503041, built 1976 (OpenAirDocs) - Reported make and model: CESSNA A185F - Registry model: [Cessna A185F](https://openairdocs.org/model/cessna-a185f) (registry code 2072821) (OpenAirDocs) - Category: Airplane - Serial number: 18503041 - Airframe hours: 2009 - Engines: CONTINENTAL IO-520 300 horsepower reciprocating - Damage: No damage - Flight: Part 135 - Operator: Cape Smythe Air Service - Registered owner: Cape Smythe Air Service - Last inspection: 100 hour, October 24, 1988, 68 hours before - Departed: BRW, BARROW, AK - Destination: SCC, DEADHORSE, AK - Flight plan: VFR - Airport: SCC, Deadhorse, runway 22, 6,500 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 37; flight instructor, airline transport; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; toxicology performed; flight hours: 4,700 total, 150 in this make and model, 4,300 as pilot in command, 400 in the last 90 days, 100 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Night/bright - Wind: 230° at 5 knots - Visibility: 7 statute miles - Lowest ceiling: none - Temperature: 12 °F, dew point 16 °F - Altimeter: 29.00 inHg - Observed at: SCC ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19881122052679I](https://openairdocs.org/incident/19881122052679I), Nov 22, 1988: Cessna A185F, Deadhorse, AK. Bounced several times landing. Collapsed unconscious on ramp. Carbon monoxide due to cracked muffler overboard tube ## Other investigations on N20752 (7) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ANC00LA099](https://openairdocs.org/ntsb/ANC00LA099), Aug 12, 2000: Cessna 185F (N20752), Barrow, AK, substantial damage. Probable cause: The pilot's selection of unsuitable terrain for landing. A factor in the accident was a hidden obstruction, and soft terrain. - [NTSB ANC97LA131](https://openairdocs.org/ntsb/ANC97LA131), Aug 25, 1997: Cessna 185F (N20752), Barrow, AK, substantial damage. Probable cause: the pilot's inadequate compensation for wind conditions, and his failure to maintain directional control of the airplane, which resulted in a ground swerve and damage to the airplane. A factor… - [NTSB ANC96LA114](https://openairdocs.org/ntsb/ANC96LA114), Aug 2, 1996: Cessna 185 (N20752), Wainwright, AK, substantial damage. Probable cause: The pilot's excessive application of the brakes during the landing roll. - [NTSB ANC95LA003](https://openairdocs.org/ntsb/ANC95LA003), Oct 15, 1994: Cessna A185F (N20752), Kotzebue, AK, substantial damage. Probable cause: A FAILURE OF THE PILOT TO MAINTAIN ADEQUATE DISTANCE FROM THE TERRAIN (SNOW BANK). FLAT LIGHTING AND LOW CONTRAST CONDITIONS WERE FACTORS IN THE ACCIDENT. - [NTSB ANC93LA147](https://openairdocs.org/ntsb/ANC93LA147), Aug 14, 1993: Cessna 185 (N20752), Point Barrow, AK, substantial damage. Probable cause: FUEL EXHAUSTION AS A RESULT OF THE PILOT IN COMMAND'S NOT REFUELING. A FACTOR IN THE ACCIDENT WAS THE OPERATOR/MANAGEMENT INADEQUATE FLIGHT FOLLOWING AND OPERATIONAL CONTROL OVER THE FLIGHT. - [NTSB ANC93LA016](https://openairdocs.org/ntsb/ANC93LA016), Nov 28, 1992: Cessna 185 (N20752), Point Hope, AK, substantial damage. Probable cause: THE FAILURE OF THE NO. TWO CYLINDER CONNECTING ROD DUE TO A SLIPPED (SPUN) MAIN CRANKSHAFT BEARING WHICH BLOCKED OFF THE OIL HOLE TO THE CONNECTING ROD. A FACTOR IN THE ACCIDENT WAS THE UNSUITABLE… - [NTSB ANC92LA067](https://openairdocs.org/ntsb/ANC92LA067), May 3, 1992: Cessna C-A185F (N20752), Barrow, AK, substantial damage. Probable cause: THE IMPROPER USE OF THE FLT CONTROLS BY THE SECOND PILOT DURING LANDING ROLL. FACTORS RELATING TO THE MISHAP WERE THE ROUGH/UNEVEN SNOW COVERED TERRAIN. From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.