nuckolls.bob(at)aeroelect
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 Posted: Fri Feb 26, 2010 2:47 pm Post subject: GPU connection philosophy |
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At 03:44 PM 2/25/2010, you wrote:
| Quote: |
<peter(at)sportingaero.com>
Bob,
When I was in the military we sometimes had aircraft in the hangar
on ground power for many hours at a time as electrics or avionics
snags were investigated. Ground Power plugs were wired up to by-pass
the battery, and most times (always?) the battery connector was pulled.
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Yeah, I've had several folks tell me of such protocols. The
protocols have existed for doing a number of things for a long
time . . . but the rationale behind those processes remain a
mystery.
| Quote: | Also, if the battery (24v Ni-Cad) was flat we took it down to the
battery bay and got another.
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I don't think ANYONE in the TC/Military world recommends
charging a flat battery while in the aircraft. This is because
certain protocols call for cap-checking any battery that's
found seriously discharged . . . particularly if the
individual who discovers the condition has no idea why
or how long the battery has been dead.
| Quote: | We also used to start the aircraft every time on external power
(unless a power rig wasn't available).
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As a TC manufacturer, I'd be delighted if everyone used
ground power to start up . . . shucks, we could probably
make a battery last twice as long in service. But the
CONVENIENCE of owning your own airborne transportation
extends to maximizing convenience for jump-in-and-go.
It's a trade off.
| Quote: | Perhaps this thinking has found its way by osmosis into the small
aircraft TC community without any good reason? Perhaps its also an
attempt to stop owners charging old wet electrolyte batteries in
situ, with the risk of acid spillage, or worse?
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I suspect you're correct. The neat thing about OBAM
aircraft, we're encouraged to understand how and
why things work with sufficient competence to craft
our own protocols.
Bob . . .
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