If you’ve been following the saga of the delays of the EADS A400M military transport program, it’s clear that the main thing holding up the testing of the aircraft is problems with its massive (10,000+ hp) turboprop engines.

It has now been revealed that this holdup is primarily the result of a bookkeeping error:

Although the A400M program has generally been running late, the pacing item since last year has been the engine – and the principal problem was a failure by Europrop International (EPI), the consortium behind the TP400-D6 engine, to recognize, until little more than a year ago, that the software in the full authority digital engine control (Fadec) did not meet European civil aviation standards.

EPI was basically working to military standards, in which Fadec software is considered to be validated by testing. Civil authorities additionally require a tightly disciplined software development process, in which every change, from the first line of the first version, is documented and traceable. Once the problem surfaced, there was nothing to be done but to go back and start again.

While I generally find system engineering, where you have some anal-retentive bloke going over the specs with a microscope, to be a pain in the ass, I acknowledge that they are needed now and again, but there don’t appear to have been any on this project.