Fife Plane Crash Investigation Reveals Water Contamination in Fuel System

On 26 March, 2026, the UK Air Accident Investigation Branch (AAIB) released a report revealing water contamination in an aeroplane’s fuel system as the cause of a plane crash near Fife Airport on 23 December, 2024.

The four-seat, single-engine aircraft killed pilot Nicholas Denison-Pender, with no other reported injuries. 

CCTV footage from Kinglassie recorded the engine misfiring, followed by the plane potentially entering a spin and crashing. A witness in another aircraft at Fife Airport reported hearing a mayday call by Denison-Pender over the radio. 

According to the report, upon takeoff, the engine “began running rough and then lost power completely,” which was caused by “ingestion of water into the carburettor float bowl, leading to water being fed into the main nozzle.” On the ground, water leaked into the wing fuel tanks due to poor sealing and visible cracking in the wing fuel rubber grommets.

The plane was in the air for ten minutes before crashing. The aircraft then “struck an area of rising ground to the north of Kinglassie” and faced significant damage to the left wing and propeller blades, with no fire occurring.

The investigation could not determine the extent of the pilot’s pre-flight inspection, though it concluded that it was “not effective in removing all the water present in the aircraft’s fuel system.”

Aircraft logbooks revealed that the plane received annual inspections from five separate maintenance organisations in a twelve-year period before the accident.

The report recommended that the aircraft manufacturer publish “maintenance information that provides specific inspection criteria for the acceptable condition” of the aircraft type’s fuel tank rubber grommet seals.

The UK Civil Aviation Authority (CAA) has begun updating its safety guidelines to incorporate more comprehensive information on the dangers of water contamination in fuel systems, which is projected to be completed in Quarter 2 of 2026. The CAA has also hosted aircraft maintenance roadshows with additional information on covered fuel caps and seals.

For more information on the AAIB investigation, the full report can be found at https://assets.publishing.service.gov.uk/media/69bd347f7e02b81c0d1c7578/Rockwell_Commander_112_TCA_N4698W_04-26.pdf.

Photo by Wikimedia Commons