"Bertie the Bunyip" wrote x

Should be, but in this engine it is non-existent. It's not diesels in
general I'm knocking. It's this engine only..

Exactly.

Limp home, or better, should be a no brainer for a diesel.

The choice not to have that feature on this particular engine is, no doubt,
an economic decision. They felt that the need for it, determined by the
risk of failure, is not a large enough factor to necessitate the extra cost
of including this feature.

Perhaps they will survey possible buyers, or determine by some other
vehicle, that this is an important reason for potential customers to not buy
their package. Doubtful, but one can hope...

As to losing the electrical supply to the fadec, only a poor design and
implementation could result in a totally bulletproof and totally reliable
system. The backup circuit and battery should supply only the fadec, and
fuel pump; only the absolute minimum necessary systems needed to keep the
fan turning. A self test should check the ability of the backup circuit to
run these systems upon every start, and also if something changes during
flight that would prevent the backup from functioning.

Is that how it is now, with the only widely used diesel? No. It should not
be difficult or overly costly to build a system to function like that. I
guess we will have to wait for the experimental crowd to design such a
system. g
--
Jim in NC