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Date: Fri, 08 Mar 2013 08:11:27 -0500
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Subject: Re: [LML] Pitch hold glitch / resolution
From: Charles Brown <browncc1@verizon.net>
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References: <list-6099281@logan.com> <41361035E6613244A377D5AC3BF5EFDD52013D65@CH1PRD0710MB367.namprd07.prod.outlook.com>

Good info, Bob.  And yes, I disconnected the static system feed line =
from the instrument manifold before blowing.=20

Did other folks put in a static system drain?  I did not; and am adding =
a static system blowout to my annual checklist.  Takes about 5 minutes.

Final note -- my Sorceror has been great too, and I presume that any =
autopilot would have the same problem with this static system blockage.

On Mar 7, 2013, at 7:44 AM, Robert R Pastusek wrote:

Charlie,=20
It's possible that a very small amount of water in the static lines was =
dissipated when you blew on it. Doesn't take but a drop to cause a =
problem...and the autopilot is looking for a pressure change MUCH =
smaller than would be needed to move the needles on your altimeters. The =
static system doesn't have to be exactly correct to drive the autopilot =
(as it needs to be for the altimeters), but it must be capable of =
transmitting the smallest change to the autopilot.

Be especially careful about applying compressed air to the static =
system. If you have ANY static instruments attached, you risk damaging =
them. 90 PSI is well beyond their operating capacity.

Good troubleshooting out there! My TruTrak autopilot has been a true =
gem...after I got it calibrated and tuned...for the past five years/800 =
flight hours (IV-P with Chelton EFIS).

BOB