In a message dated 11/7/2007 8:47:06 A.M. Central Standard Time,
rpastusek@htii.com writes:
You
have a good point if you intend/need to troubleshoot while still in the air.
As I noted in my original post, many years of doing this in military fighters
(as a weapon systems operator—with a well qualified pilot still flying the jet
and typically swearing because his xyz was not working) convinced me that this
was (in my experience) a totally pointless exercise. I’m pretty sure I never
recovered a system by resetting a CB, and I once caused a fire in the cockpit,
and killed a generator another time. Still, I’ve heard that others have
successfully recovered systems by resetting CB’s. So in the end, you make your
own tradeoffs/decisions. Everything is a compromise at some
level…
Bob,
You are correct about the flight regime but I find certain
breakers very useful during maintenance, especially if the Master Switch must be
on during the work or for certain testing.
1. Hydraulic pump breaker (and the relay inline fuse
wired after the breaker). This eliminates the pump running or relays be
being selected when one doesn't want it operating.
2. TC breaker - reduces load on battery when checking other
things
3. Alt field breaker - reduces load.
4. Certain electronic flight instruments - reduces
load.
5. Certain avionics components (no on-off switch) can be
excluded.
Interestingly, occasionalIy have a use for the Facet pump (aux
tank to header) breakers in flight with the automatic keep-the-header-full
engaged. I can disable one of the pumps for a while in order to balance
the mistake of mis-fueling the aux tanks - more fuel in one than the
other.
I certainly like fuses for most circuits - mine are accessible
only if I remove the glare shield - a minor hassle.
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL
(KARR)
Darwinian culling phrase: Watch
This!