I believe the Columbia 400 has a low, off, arm  toggle.
In the arm position if the fuel pressure drops the high fuel pressure pump
is engaged and locked on until turned off.

There you would need to turn it OFF arm before you start backing off the
throttle to land. I would imagine it might come on when you switch tanks.

Is that correct ? Any comments about safety ? Something we should consider
for the TSIO-550 ? -----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dan
Ballin
Sent: Wednesday, June 06, 2007 8:38 AM
To: lml@lancaironline.net
Subject: [LML] Boost switch

With the current discussion about the recent accident, I am curious
what others have done with the fuel boost pump switch.  It seems like
the options  are for separate switches for high and low, a 3 way Low -
Off - High and with a 3 way with the High being momentary.  I think I
am favoring the  later with the thinking that the high boost is really
only needed during start for engine prime and as Skip stated this
precludes leaving the high boost on.
Other thoughts?  Does this apply to the IO-550 as well?
Do any of you flying, use the high boost for anything else.  In an
emergency would you use high or low boost or try both?

I am doing a IO-550 in a Legacy.

Dan Ballin
LEG2
#286

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