Ed, with reference to CAA Regs double skinned pipework is focussed where there is a higher risk of fuel tank explosion. All the mods are contained in SFAR 88, Airworthiness Notice 55 issued by the CAA and EASA. In the case of the BBJ it concerns double skin pipes feeding the aux fuel tank. Things like proximity to conditioning packs would raise the probability of fuel fire/explosion. Operators failing to comply, (in the case of a 4 year old BBJ, kit cost $180,000 similar fitting costs), will have the aux tanks made inoperable.
Given that the Nimrod shares the same skies as all civil airliners then it would be interesting if a route could be engineered for the CAA to inspect a Nimrod on line?
Last edited by nigegilb; 6th Dec 2007 at 21:13.