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1. 06:30 PM - Re: Re: Fw: [Bearhawk] Pacer progress (Robert L. Nuckolls, III)
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| Subject: | Re: Fwd: [Bearhawk] Pacer progress |
At 12:19 PM 6/22/2015, you wrote:
Panel is almost ready to instal. Dimmer pot for the Ei hardware
should be here today. Head set jacks extended. A few zip ties
remain. On the subject of stuck starter solenoids. On my list of
pros and cons for locating the starter contactor under the seat...
How easy is it to get at if I need to whack it with something or
disconnect it from the battery?
Normally, shuts off the battery master to stop
the fault . . . so that it can be dealt with in a
relaxed manner.
Deciding the trade off... More wire up the firewall to a solenoid
location accessible with the cowl open. Or deal with pulling the seat.
Ideally, one chooses a starter contactor designed
to minimize the sticking phenomenon . . . THEN one
also MAINTAINS the battery in a condition that
(1) provides design-goal-driven endurance requirements
from which the happy condition (2) arises: Risks for
starter contactor sticking are significantly reduced.
Marv and I spoke yesterday about the avionics master. When the
PM3000 and the Sandia transponder was installed. The avionics guy
told Marv and I to pull the breakers for them before starting the
engine. Don't recall the reason.
I'll bet he doesn't have one . . . beyond the notion
that 'everybody does it' . . .
Further, pulling a breaker is not accepted operational
practice . . . you won't find that behavior in any
TC aircraft POH. If shutting a thing OFF for cranking
operations is a good thing to do . . . then the reason
is probably NOT something you want to spend money on.
If the battery is nearly dead, low voltage....start contactor just
asking to be stuck. Or brown out. A good battery shouldn't pull
down below 10.8 volts under a load. What if it does due to poor
health or some other reason. Being in the middle of now where. Many
many times waiting for the temperature to reach 25 below zero before
the first flight. Decided the avionics master is a good thing for me.
BINGO! Routine preventative maintenance of the battery
is the time honored, demonstrated recipe for comfortable
completion of missions to PREDICTABLE compliance with design
goals while minimizing miseries. There is NO GOOD
REASON to be "in the middle of nowhere" with a
soggy battery . . . there are lots of bad reasons . . .
mostly founded in the owner/operators's less than
responsible attitudes toward battery maintenance.
Being short on fuel 'in the middle of nowhere' would get you
many raised eyebrows around a table of suds and pizzas . . .
sadly, being caught in-the-wild with a soggy battery
is all too often simply attributed to 'bad luck'.
I suggest that it is easy to make it NOT so . . .
Bob . . .
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