helicopterray - that sounds
very plausible; I'll ask the lads to check that out. What activates the pressurizing valve - is it just fuel pressure, or is it electrically activated? Are you a technician? Have you experienced this problem before on the Arriel engine? If so, I may PM you you to pick your brains a bit more...
RVDT - the aircraft has suffered from slow starts for a long time, but only recently has it occasionally hung completely. With a GPU, voltage on the VEMD is typically 26.4v and significantly, doesn't drop anything like as much as when starting using the aircraft's SAFT battery, maybe by 1-2 volts, instead of the 5-6 volts. As far as I know, all the basic things have been checked - several times
Thanks both for the advice - much appreciated!