Air Ministry Official Notices: Instructions to Aircraft Owners and Ground Engineers Regarding Essential Modifications

Instances have occurred of transverse fatigue failure of the blade sheet of Fairey‐Reed airscrews fitted with metal hub blocks, the fractures commencing at the holes for the hub bolts or the tubular bolts securing the metal blocks, and extending towards the leading and trailing edges. An instance has also occurred of transverse fatigue failure commencing from the identification stamping.