Fred,
"There's no way to wire the 914 pumps to any single electrical system
which would meet current FAA rules, were this a production A/C. It's
also interesting to note that this is a relaxation of the rule prior to
1965, since way back then one pump must have been engine-driven. Now
redundant electrical pumps are permitted if there are two independent
sources of power (spelled batteries)."
Given that requirement, are not "two independent sources" a
battery and an alternator, just as an engine-driven pump and an electric one
are two independent sources of pressure?
What am I missing?
Cheers, Ferg
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