# NTSB CEN23FA201: Cessna 182T, N577TZ, Grand Isle, LA, May 24, 2023 - Type: NTSB accident investigation - Classification: Accident · Fatal · Class 3 · Field · Final report - Date: May 24, 2023, 11:01 local (16:01 UTC) - Place: Grand Isle, LA · Airplane wreckage missing about 2 miles offshore of Grand Isle, LA; aircraft recovered June 11, 2023. - Coordinates: 29.256404, -89.91293 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=29.2564&lon=-89.9129&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Miscellaneous/other](https://openairdocs.org/ntsb-events/900) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed - Report: Approved by Office Director - Investigation class: Class 3 - NTSB office: Central Region - Parties: Textron Aviation, Inc., FAA, Lycoming Engines - NTSB case key (mKey): 192235 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN23FA201 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192235/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=192235 - Page: https://openairdocs.org/ntsb/CEN23FA201 ## Probable cause The pilot’s operation of the airplane while intoxicated, resulting in its impact with the ocean. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Impairment/incapacitation: alcohol](https://openairdocs.org/ntsb-findings/02012015): Personnel issues › Physical · Pilot (probable cause); cases with it: [Cessna 182T, 1 case](https://openairdocs.org/ntsb-findings/02012015/cases.md?model=2072703), [All aircraft, 87 cases](https://openairdocs.org/ntsb-findings/02012015/cases.md) - [Performance/control parameters](https://openairdocs.org/ntsb-findings/01062000): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Cessna 182T, 4 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=2072703), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md) - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Cessna 182T, 11 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=2072703), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Miscellaneous/other](https://openairdocs.org/ntsb-events/900) (defining event); cases with it: [Cessna 182T, 3 cases](https://openairdocs.org/ntsb-events/900/sequence.md?model=2072703), [All aircraft, 1,556 cases](https://openairdocs.org/ntsb-events/900/sequence.md) - [Maneuvering-low-alt flying: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 182T, 17 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072703), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis Company information and ADS-B data indicated that the pilot performed several low-level flight maneuvers for about 3 hours that were consistent with aerial observation for fish spotting activities. A boat captain, who was in communication with the accident pilot regarding the fish spotting plans for the day, stated the pilot seemed upset, agitated, and discouraged during his radio communications, which he stated was abnormal for the pilot. Due to his concerns about the pilot’s attitude, the boat captain told the pilot to land and take a break. The pilot stated he was going to fly to the north, and there were no further communications with the pilot. The last ADS-B contact showed the airplane about 1.8 miles offshore on a southwest heading about 175 ft above the ocean water. There were no emergency or distress calls received from the accident airplane. Company personnel notified the US Coast Guard about a missing airplane and a search was initiated. The pilot’s body was located the following morning near a coastline, and about 1 week later the airplane was located by a fishing vessel and subsequently recovered. Damage to the airplane structure was consistent with the airplane impacting the water in an upright, slight nose-down attitude at a relatively slow airspeed. Postaccident examination of the airplane revealed no mechanical malfunctions or failures that would have precluded normal operation. Toxicological testing detected ethanol in all of the multiple tested postmortem specimens of the pilot. Although some of the detected ethanol may have been from sources other than alcohol consumption, based on the pattern of ethanol results and the pilot’s witnessed behavior, the pilot had likely consumed alcohol and was impaired by the effects of alcohol at the time of the accident. The pilot’s impairment due to the effects of alcohol likely precluded his ability to safely operate the airplane. ## Factual narrative On May 24, 2023, about 1101 central daylight time, a Cessna 182T airplane, N577TZ, sustained substantial damage when it was involved in an accident near Grand Isle, Louisiana. The pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 aerial observation flight. According to company information and ADS-B data, the pilot departed his home base of Ocean Springs, Mississippi, about 0805 for a routine fish spotting flight. ADS-B data indicated that the pilot performed several low-level flight maneuvers for about 3 hours that were consistent with aerial observation for fish spotting activities. During the flight, about 1030, the pilot made radio contact with a boat captain to coordinate a short flight to the west of the boat to scout fish locations. The boat captain stated the pilot seemed upset, agitated, and discouraged due to some unknown issue that occurred the day before. During the radio communications, the pilot stated several swear words and inappropriate language, which was extremely abnormal for the pilot and in violation of company policy. The pilot descended to about 500 ft above ground level near Cat Island, and the boat captain could tell the pilot was still upset. The boat captain told the pilot to go land the airplane and take a break. The pilot stated he was going to fly to the north and that was the last communication the boat captain had with the pilot. About 1104, the boat captain texted the pilot to let him know he was not going to fish to the west; there was no response from the pilot. The last ADS-B contact showed the airplane about 1.8 miles offshore on a southwest heading about 175 ft above the ocean water (see figures 1 and 2). Figure 1. ADS-B data showing the end of the flight track. Figure 2. ADS-B data showing the end of the flight track. There were no emergency or distress calls received from the accident airplane. Based on company flight tracking information, company personnel notified the US Coast Guard about a missing airplane and a search was initiated. The pilot’s body was located the following morning near a coastline, but the airplane was not located. On June 6th, a shrimp boat fishing net caught the airplane. Unable to raise the airplane onto the boat, the shrimp boat captain cut the net and noted the location. On June 11th, a majority of the airplane wreckage was recovered about 1.8 miles offshore of Grand Isle in about 15 ft of water. An autopsy of the pilot was performed by the Jefferson Parish Forensic Center, Harvey, Louisiana. According to the autopsy report, the cause of death was multiple blunt force injuries and drowning, and the manner of death was accident. The FAA Forensic Sciences Laboratory performed toxicological testing on postmortem specimens from the pilot. No drugs of abuse were detected. Ethanol was detected in cavity blood at 0.278 g/dL, in vitreous fluid at 0.245 g/dL, in muscle tissue at 0.249 g/dL, and in brain tissue at 0.283 g/dL. N-propanolwas detected in cavity blood and brain tissue and was not detected in vitreous fluid or muscle tissue. N-Butanol was detected in cavity blood and was not detected in vitreous fluid, muscle tissue, or brain tissue. Ethanol is a type of alcohol. It is the intoxicating alcohol in beer, wine, and liquor, and if consumed, can impair judgement, cognition, and vigilance. Performance impairing effects can include worsening judgement and reaction times, alterations in perception of the environment, poor coordination and changes in behavior and mood. Performance-impairing effects worsen as blood levels of ethanol increase. Once consumed, ethanol is absorbed into circulation and rapidly distributes into total body water, resulting in relatively similar ethanol levels in various body tissues. Alcohol consumption is not the only possible source of ethanol in postmortem specimens. Ethanol can sometimes be produced by microbes in a person’s body after death. Postmortem ethanol production is made more likely by extensive traumatic injury. Vitreous fluid generally is better protected from postmortem microbial spread and therefore is less susceptible to postmortem ethanol production than other specimen types. FAA regulations impose strict limits on flying after consuming ethanol, including prohibiting pilots from flying with a blood ethanol level of 0.04 g/dL or greater. N-propanol and n-butanol are other alcohols that can be produced by microbes in a person’s body after death. Their presence is a postmortem specimen, which is potentially indicative of postmortem microbial activity in the specimen but does not reliably indicate that postmortem ethanol production occurred. The extent of airframe damage during the water impact was unknown due to ocean tide activity, the shrimp boat net entangling the wreckage, and subsequent recovery operations. The fuselage was recovered in about four main sections: forward fuselage, mid-fuselage, empennage, and left wing. The right wing, two cabin doors, lower engine cowling, and a portion of the upper rudder surface were not located. The forward fuselage, which included the engine and propeller assembly, sustained underside crush damage. The nose landing gear strut was bent and pushed aft about 60° into the firewall and forward fuselage floor. The forward fuselage floor was bent and distorted (see figure 3). Neither forward seat restraint was found secure in their respective buckle assemblies. The fuel selector valve was found in the BOTH fuel tank position, and fuel was noted in the valve. A damaged can of White Claw Hard Seltzer, which appeared to be unopened, was located behind the instrument panel. Figure 3. Right side of forward fuselage, engine, and propeller assembly. Flight control continuity was established from the mid-fuselage section to the cockpit controls. Disconnects in the flight control cables and system were consistent with impact and recovery operations. The left-wing flap was recovered in the extendedposition, and the flap push/pull rod was bent and prohibited the flap from retracting. The right flap and flap actuator were not recovered. The elevator trim tab measured about 10° tab down (nose up). The engine remained attached to the engine mount, and the propeller remained attached to the engine. Corrosion and ocean silt debris were noted on the engine. The engine fuel pump, fuel flow divider, fuel servo lines, and fuel servo contained evidence of fuel. The propeller was manually rotated; thumb compression was noted on all 6 cylinders, and mechanical continuity was noted throughout the engine. Postaccident examination of the airplane revealed no evidence of any preimpact mechanical malfunctions or failures that would have precluded normal operation. ## Aircraft - Registration: [N577TZ](https://openairdocs.org/aircraft/N577TZ), registered now, S/N 18281123, built 2002 (OpenAirDocs) - Reported make and model: CESSNA 182T - Registry model: [Cessna 182T](https://openairdocs.org/model/cessna-182t) (registry code 2072703) (OpenAirDocs) - Registry engine: [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series) (registry code 41530, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18281123 - Year built: 2002 - Airframe hours: 8446 - Engines: Lycoming IO-540-D4B5 260 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial observation, Part 91 - Operator: Westbank Fishing LLC - Registered owner: Westbank Fishing LLC - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 1, 2023 - Departed: 5R2, Ocean Springs, MS - Equipment: Electronic primary flight display, Electronic multifunction display, Handheld GPS, ADS-B, Stall warning system, Onboard weather ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 33; injuries: fatal; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; last flight review April 10, 2023; toxicology performed; flight hours: 8,000 total, 3,000 in this make and model, 8,000 as pilot in command, 200 in the last 90 days, 185 in the last 30 days, 10 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 88 °F - Observed at: KGAO, 21 nm away - METAR: METAR KGAO 241555Z AUTO 03007KT 10SM SCT020 BKN040 BKN049 29/22 A2994 RMK AO2 T02920223= ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20230524009229A](https://openairdocs.org/incident/20230524009229A), May 24, 2023: Cessna 182T, Grand Isle, LA, Destroyed, 1 fatal. Invistigator recieved a call from the roc at approxmently 0800CST on may 25, 2023 to provide notification of a missing aircraft conducting fish spotting over… ## Docket (13 files) The files NTSB released with the investigation on June 4, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=192235. 38.1 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 2.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626018&FileExtension=pdf&FileName=NTSB%20Accident%20Report_Redacted-Rel.pdf - Record of conversation - boat captain (item 2, PDF, 1 page, 66 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17293897&FileExtension=pdf&FileName=Captain%20Ketnor%20ROC-Rel.pdf - ADS-B data (item 3, CSV, 17.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626028&FileExtension=csv&FileName=20230524_A76A2B_516316865_ADSB-Rel.csv - ADS-B flight track images (item 4, PDF, 4 pages, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626215&FileExtension=pdf&FileName=ADS-B%20Flight%20Images%20-%20Google%20Earth-Rel.pdf - USCG search and rescue timeline (item 5, PDF, 7 pages, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626225&FileExtension=pdf&FileName=IncidentManagementTimeline_Sector%20New%20Orleans_Overdue_Aircraft_24%20May%202023%20(zulu)_Redacted-Rel.pdf - Examination summary (item 6, PDF, 20 pages, 5.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17293780&FileExtension=pdf&FileName=CEN23FA201%20-%20Examination%20Summary-Rel.pdf - Airplane fuel record (item 7, PDF, 1 page, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626056&FileExtension=pdf&FileName=May%202023%20fuel%20log%20(5R2)%20_Redacted-Rel.pdf - Airframe logbook (item 8, PDF, 15 pages, 5.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15625523&FileExtension=pdf&FileName=Airframe%20Logs_Redacted-Rel.pdf - Engine logbook (item 9, PDF, 14 pages, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626306&FileExtension=pdf&FileName=Engine%20Logs_Redacted-Rel.pdf - Statement of party representatives to NTSB investigation - Textron aviation (item 10, PDF, 1 page, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15625818&FileExtension=pdf&FileName=CEN23LA201%20-%20Textron%20Party%20Form_Redacted-Rel.pdf - Statement of party representatives to NTSB investigation - Lycoming engines (item 11, PDF, 1 page, 192 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15626066&FileExtension=pdf&FileName=Certification%20of%20Party%20Representative%20CEN23LA201%20Lycomig_Redacted-Rel.pdf - Toxicological report (item 12, PDF, 2 pages, 636 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17293598&FileExtension=pdf&FileName=Pilot%20TOx_Redacted-Rel.pdf - Medical factual report (item 13, PDF, 6 pages, 204 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18680702&FileExtension=pdf&FileName=CEN23FA201_grand%20isle%20LA%20Medical%20Factual%20Report-Rel.pdf 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.