I've just been handed a copy some information being disemminated to the MOD supply lines concerning JC5a and corrosion problems associated with it.Apparently there is to be an embargo on the use of this product (Titanine and Desoto manufactured) throughout the MOD aviation world, specifically Nimrods. From my Google search, it seems to have its roots in a Boeing AD dated 2002 concerning corrosion in undercarriages and their attachments. There is no mention of JC5a batch numbers or even anything to do with investigation into Boeing production methods. (Heat treatments or cleanliness etc) So, how can it be that a product which has been in service for so long is suddenly a pariah? Anybody care to comment if there has been a subsequent rumble throughout the CAA world which may have fizzled out?