According to the Guernsey Press, both ATRs needed frame replacement work carried out. No mention of a cause common to both aircraft, although apparently G-COBO had a drill bit found under the floor left there in the manufacturing process. This had rusted (presumably this was of steel), and had caused (bimetallic?) corrosion of the frames it touched, which would otherwise have been OK.
Sounds as if the very specific "foreign object" damage on G-COBO was only local, but it would be very interesting to know what the more general problem was with the frames on both.
Can't say I noticed anything rattling under the floor on my flights in G-COBO to date!!!
