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I guess I'm not sure of the logic here. If your
mechanical fuel pump fails don't you need high boost to keep the engine
running?
----- Original Message -----
Sent: Tuesday, August 25, 2009 6:17
AM
Subject: [LML] Re: Fuel Flow Issue
Solved
Here is how I currently operate my IO-550 on a
Legacy.
Low Boost on for takeoff and landing. Low boost on over
9,000 for vapor suppression.
Low Boost for takeoff and landing is the
recommendation of my HIPAT instructors (Ernie and Josh). I had not had
any problems not using low boost but what the heck, it is easy enough to do
and if it prevents a loss of power on takeoff or landing it is worth
it.
Low boost on over 10,000 is recommended by many. I did not
use to do it, but have noticed some surging as low as 9,000 if I do not.
I
have been told that this is particularly a problem on hot days and is due to
high vapor pressure of hot fuel combined with the lower ambient pressure at
altitude.
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