BFC Challenger II, G-BYKU
The propeller and hub assembly detached from the aircraft at a late stage on the approach. The pilot was able to continue with a glide approach and landed safely on the runway. The investigation established that thread locking compound had not been applied to the propeller hub mounting bolts, allowing them to vibrate loose. This resulted in fatigue cracks developing in the bolts, causing them to fail.
BFC Challenger II, G-BYKU 11-09.pdf (609.93 kb)
Date of occurrence: 22 July 2008