What happened
On 17 May 1998, a Taylor Monoplane (registration G-BCRJ) was performing a private flight from Andrewsfield, Essex. The aircraft, which featured a Volkswagen 160 and was an open-cockpit version, took off from a grass runway under favorable weather conditions. However, shortly after becoming airborne, the engine began to run very roughly, and the aircraft's climb performance was severely degraded.
As the aircraft passed the airfield clubhouse, observers noted that the engine sound suggested a reduction in throttle setting. The pilot attempted to maintain altitude by performing a series of shallow climbs and descents. While attempting a right-hand turn at an altitude of approximately 200 to 300 feet, the angle of bank increased sharply to 45 degrees. This caused the right wing to drop, leading the aircraft into a steep, 70-to-80-degree nose-down spiral. The aircraft impacted the ground almost vertically within a single rotation, resulting in one fatality.
The investigation
Investigators examined the wreckage in a field of standing rye and analyzed the engine, ignition, and fuel systems. The investigation focused on several potential causes for the engine's performance degradation. The fuel system was found to be serviceable, though a small amount of water was discovered in the carburettor, likely due to condensation during a period of dormancy.
Detailed inspection of the engine revealed that the magneto drive chain was very loose. Because the aircraft lacked a chain tensioner, the chain was capable of jumping teeth on the drive sprocket. Furthermore, the wiring for the magnetos and tachometer was found to be of an extremely poor standard of workmanship, featuring inexpertly soldered joints and uninsulated connections. The investigation also noted that the right magneto had a history of intermittent issues that had not been fully rectified.
Findings
- The aircraft suffered a partial loss of engine power during the takeoff phase.
- The engine's performance was likely compromised by a combination of factors, including the loose timing chain causing retarded ignition timing on the left magneto and potential issues with the right magneto.
- Poor electrical workmanship, specifically regarding the magneto and tachometer wiring, contributed to the engine'malfunction.
- The pilot's decision to attempt a turn in an aircraft with marginal performance during turbulent conditions led to the fatal loss of control.