Landing gear not configured: Cessna 680 Citation Sovereign, N680SA, accident on August 18, 2024, at Washington-Warren Airport (OCW/KOCW), Washington, North Carolina

• Location: Washington, North Carolina 
• Accident Number: ERA24LA351 
• Date & Time: August 18, 2024, 21:39 UTC 
• Registration: N680SA 
• Aircraft: Cessna 680 
• Aircraft Damage: Substantial 
• Defining Event: Landing gear not configured 
• Injuries: 1 Minor, 2 None 
• Flight Conducted Under: Part 91: General aviation - Positioning

https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194945/pdf

https://data.ntsb.gov/Docket?ProjectID=194945

The business jet landed on the runway at the completion of a visual approach with the landing gear retracted. The airplane slid to a stop, and a post-crash fire ensued which resulted in the airplane sustaining substantial damage. The two pilots, the sole occupants, egressed the airplane successfully without injury. In telephone interviews and written statements, the pilots each stated that there were no mechanical deficiencies with the airplane that would have precluded deployment of the landing gear and a successful landing.

The first officer further stated that the gear warning was only audible in the left seat (Captain’s) headset and was not heard in her headset (right seat) or the overhead speaker, and that the communications panel had a “history” of problems.

Review of the cockpit voice recorder (CVR) confirmed the limitations of the airplane’s communication system, that the crew was aware of them, and that they discussed and debated how to mitigate the system’s limitations.

The review also revealed that during the flights on the day of the accident, the performance of Before-Starting-Engines, Engine Start, Before Taxi, Before Takeoff, Before Landing and other tasks did not comport with the manufacturer’s checklists and were sometimes performed without any verbal communication between crewmembers. The CVR recording further revealed that the captain removed his headset due to a 500Hz “squeal” that he failed to identify as the gear warning horn, and consequently missed the repeating, “too low, gear” aural warning that followed.

- Probable Cause: The flight crew’s failure to properly configure the airplane before landing and the captain’s subsequent failure to recognize the landing gear aural warning, which resulted in a gear-up landing. Contributing to the accident was the flight crew’s inadequate checklist use and crew coordination, and the known diminished capability of the airplane’s communication system.

Loss of engine power (total): Piper PA-24-250 Comanche, N6430P, accident on June 25, 2023 at Alturas Municipal Airport (AAT/KAAT), Alturas, California

• Location: Alturas, California 
• Accident Number: WPR23LA239 
• Date & Time: June 25, 2023, 09:00 Local 
• Registration: N6430P 
• Aircraft: Piper PA-24-250 
• Aircraft Damage: Substantial 
• Defining Event: Loss of engine power (total) 
• Injuries: 1 Minor 
• Flight Conducted Under: Part 91: General aviation - Personal 

https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192448/pdf

https://data.ntsb.gov/Docket?ProjectID=192448

On June 25, 2023, at 0900, Pacific daylight time, a Piper PA-24-250, N6430P, was substantially damaged when it was involved in an accident near Alturas, California. The pilot sustained minor injuries. The airplane was operated as a Title 14 Code of Federal Aviation Regulations Part 91 test flight.

The pilot reported that, shortly after takeoff, the airplane’s engine began to run rough, so he returned to the airport, landed uneventfully, parked the airplane, and deplaned his passengers to conduct another preflight inspection. The pilot sampled the fuel, checked for loose spark plugs, and checked the magnetos. The pilot then decided to do an engine run-up and test flight before departing the area with the passengers. After takeoff, about 100 ft above ground level (agl), the engine began to shake violently, and he initiated a turn back to the airport. The engine lost total power, and the airplane landed hard and came to rest upright in the grass adjacent to the runway, resulting in substantial damage to fuselage, both wings, and the right horizontal stabilizer.

Postaccident examination of the engine established mechanical and valvetrain continuity. When the propeller was rotated, the No. 5 ignition harness top lead did not spark. The right magneto was removed and functionally tested with an intermittent spark. The left magneto was also removed, and spark was obtained on all posts during the functional check. Further testing revealed that the intermittent spark from the right magneto could not be duplicated. Disassembly of right magneto revealed about 1/4 of the teeth were separated from the distributor gear, which would likely result in a partial loss of engine power and a rough running engine. No additional evidence of any preexisting mechanical malfunctions that would have precluded normal operation were observed with either magneto. 

- Probable Cause: A loss of engine power due to the failure of the right magneto distributor gear and the pilot’s decision to conduct a test flight with known mechanical issues.

Loss of engine power (partial): Denney Kitfox, N605GK, accident occurred on May 10, 2024, near Powell, Wyoming

• Location: Powell, Wyoming
• Accident Number: WPR24LA148
• Date & Time: May 10, 2024, 10:30 Local
• Registration: N605GK
• Aircraft: KJELSRUD GARY KITFOX
• Aircraft Damage: Substantial
• Defining Event: Loss of engine power (partial)
• Injuries: 1 None
• Flight Conducted Under: Part 91: General aviation - Personal

https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194247/pdf

https://data.ntsb.gov/Docket?ProjectID=194247

On May 10, 2024, about 1030 mountain daylight time, an experimental amateur-built Kitfox airplane, N605GK, was substantially damaged when it was involved in an accident near Powell, Wyoming. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.

The pilot of the experimental amateur-built airplane was departing from his private dirt strip when the accident occurred. The airplane exhibited a partial loss of engine power when it was about halfway down the runway. The pilot elected to proceed with the takeoff due to an irrigation canal at the end of the runway. The airplane would not gain altitude and subsequently struck two fences before nosing over and coming to rest inverted in a nearby yard.

Postaccident examination of the engine revealed that one of the two piston-type carburetors had the retaining clip for the jet needle set to the leanest position. The other carburetor was set to the engine manufacturer’s specified position. It is likely that the overly lean setting in one of the carburetors caused the carburetors not to be synchronized, which resulted in the partial loss of engine power during takeoff. According to the pilot, he adjusted the carburetor’s retaining clip to lower the cylinder temperature while he was flying in a different state and did not notice any loss of engine performance. However, this was his first attempted takeoff in Wyoming, that was located at a high elevation. 

- Probable Cause: The pilot’s adjustment of the carburetor to an incorrect setting, which resulted in partial loss of engine power during takeoff.

Fuel exhaustion: Cessna 172K Skyhawk, N84385, accident occurred on June 23, 2023, near Marana, Arizona

• Location: Marana, Arizona
• Accident Number: WPR23LA241
• Date & Time: June 23, 2023, 04:04 Local
• Registration: N84385 Aircraft: Cessna 172K
• Aircraft Damage: Substantial
• Defining Event: Fuel exhaustion
• Injuries: 1 None
• Flight Conducted Under: Part 91: General aviation - Personal

https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192461/pdf

https://data.ntsb.gov/Docket?ProjectID=192461

On June 23, 2023, about 0404 mountain daylight time, a Cessna 172K, N84385, was substantially damaged when it was involved in an accident near Marana, Arizona. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.

The pilot departed on the cross-country flight with an estimated 38 gallons of fuel onboard. While enroute, the pilot deviated from the direct route to his destination, which increased his enroute time and distance. Flight track data revealed that the airplane arrived near the planned fuel stop, but the pilot stated that he diverted to another airport when he could not activate the runway lights at his intended fuel stop. After travelling for about 3 hours, 46 minutes, a total of about 467 miles, and about 5 miles short of the airport intended to be his second fuel stop, the engine lost total power about the time that the pilot stated that the fuel quantity gauges had “dropped all the way to basically nothing.” The pilot reported that there were no mechanical malfunctions or failures that would have precluded normal operation but suspected that the airplane may have developed a fuel leak. Postaccident examination revealed no evidence of a fuel leak. Based on the available information, it is likely that the loss of power was the result of fuel exhaustion. The Owner’s Manual Cruise and Range Performance Chart revealed that with 38 gallons of fuel, the accident flight’s distance and time enroute were within the chart limits; however, the accident flight consisted mostly of low altitude maneuvering flight that were not addressed by the Owner’s Manual.

Field sobriety testing of the pilot was conducted at the scene of the accident, with no determination of impairment being made by law enforcement at that time. Toxicological testing of the pilot’s blood indicated that the pilot likely had used a cannabis product, cocaine, amphetamine, and MDMA. Although his use of these controlled substances conveyed significant risk of impairment, available evidence was insufficient to determine the precise timing of his substance use, specific impairing effects during the accident flight, or whether such effects contributed to the accident.

- Probable Cause: A total loss of engine power due to fuel exhaustion.