TOFO, point taken and I'm certainly not a Time Lord! Would Mk2 be a more acceptable substitution for MRA4? As to probable cause, that is the best one can ever hope for in most cases, and I accept your blue pencil correction. I was commenting on the airworthiness shortcomings of the fuel system that are thought to be responsible for the probable cause. If the Regulations had been adhered to then they would not have existed, and 14 lives would probably have been saved. Yes?