Raj Hamsa X’Air 133(1), G-CDHO
When close to Tilbury Docks, during a training flight, the magneto rotor separated from the engine, causing it to stop, and damaged the propeller. The instructor carried out an uneventful forced landing in a field adjacent to the river Thames. The magneto separation was due to the failure of the crankshaft stub shaft, from crack propagation due to a torsional fatigue mechanism. Damage to the magneto coil formers indicated that the rotor had been operating out of alignment, increasing the torsional loads within the shaft. The cause of the misalignment was probably due to an impact on the magneto rotor, during engine handling, between a workshop visit in July 2005 and re-installation of the engine.
Raj Hamsa XAir 133(1), G-CDHO 1206.pdf (773.22 kb)
Published 10 December 2014