Glider Crash Investigation Highlights Weight as Contributory Factor
A tragic glider accident at Darley Moor Airfield in Derbyshire has been the subject of a detailed investigation by the Air Accidents Investigation Branch (AAIB). The incident, which occurred on April 8 last year, resulted in the deaths of pilot Edward Browne, 66, and passenger James Litchfield, 64. The pair were on an introductory flight experience, a gift from a family member to Mr Litchfield, when their Hoffmann H36 Dimona aircraft crashed shortly after takeoff.
Excessive Payload Identified in AAIB Report
The AAIB report, published recently, describes the glider's weight during takeoff as a 'contributory' factor in the accident. Investigators found that the aircraft's payload was significantly above the advised maximum. The recommended limit for such an aircraft is 170.6kg, but this glider was carrying approximately 206kg, exceeding the limit by more than 35kg. Payload calculations are based on subtracting the weight of non-lifting parts from the empty aircraft weight, a critical measure for safe flight operations.
Witnesses at the scene, including attendees of a cycling event on the adjacent Darley Moor racetrack, reported seeing the aircraft begin to sway moments after takeoff. It then rolled swiftly to the right and plunged to the ground. The AAIB report details these movements as 'wallowing' before the glider fell 'in a steep nose-down attitude from approximately 100 to 150ft.' The aircraft took off 'as expected' but was subsequently 'unable to maintain a safe climbing speed or trajectory,' according to the investigation.
Investigation Findings and Safety Measures
Despite identifying the weight issue, the AAIB was 'unable to determine why the aircraft did not climb normally or what factors contributed to the pilot not being able to carry out a successful forced landing.' No evidence of technical engine problems was found. However, the report noted that a 'Daily Inspection' book had not been signed, leaving no record of weight and balance calculations prior to the flight. An earlier weighing report had incorrectly listed the payload as 184kg, but the investigation suggests it was actually 206kg.
The pilot's weight was estimated at 75kg, while the passenger weighed 113kg, contributing to an overall aircraft weight of at least 791.6kg. This was 'approximately 35kg above the maximum allowable takeoff weight for non-lifting parts.' The AAIB emphasized that while the excess weight was a contributory factor, it was not deemed causal. In response, the glider's operating club has implemented new safety protocols, including online data capture for flight bookings and mandatory flight waivers. Boarding weights will now be verified at the airfield before introductory flights.
Industry-Wide Safety Enhancements
The British Gliding Association has communicated with its member clubs to reinforce guidance on introductory flights and underscore the importance of thorough flight preparation. Plans are underway to issue notices to inspectors, stressing the need to identify all relevant information, such as non-lifting parts limitations, in aircraft weighing reports. Darley Moor Airfield, located on a disused wartime aerodrome with a racing circuit in its northern section, remains an active site for aviation enthusiasts.
Witnesses described the harrowing scene, with one stating, 'I was at an event at the racetrack. The plane just tumbled out of the sky and nose-dived straight into the ground. People called the ambulance and the police and everything and the event was cancelled.' The flight operator, though not named in the report, has revised its booking processes to enhance safety measures. Meanwhile, the families of the victims have released photos, and authorities continue to investigate, appealing for witnesses or dashcam footage from the area around the time of the crash.
