Ed Sett 100: I believe that over the past year you and I have come to respect each others views and opinions. Having said that, views and opinions are one thing, evidence and statements presented by specialist is something else. And whilst it may run contrary to our views and opinions it has to be respected and taken seriously.
Whether we like it or not, hazard H66 has a hazard severity rating of CATASTROPHIC. It is currently set on the data base has having a probabilty of IMPROBABLE. Is was recommended by QinetiQ in 2008 that because there had been two duct failures this should be reset to OCCASIONAL. This would give it a HRI of "A".
According to the safety case developed by BAes a failure in this area has the "Potential for hot air leaks from the LP & HP ducting on rib 2 to impinge on the engine bay top scin and electrical wiring. The leak would also impinge on the CSDU cooling oil pipe installation together with fuel and hydraulic pipelines creating a potential for overheated systems"
So, unfortunately, I am unable to agree with you on your ALARP approach, and remind you that detection and suppression and drills do not mitigate the hazard, only the accident. If some one told you that the electrical wiring in your house was unsafe and could cause a fire would you simply go out and buy a smoke detector and extinguisher, or would you have the wiring replaced/redesigned?
DV