Message-ID: <20000612132941.3549.qmail@web4803.mail.yahoo.com>
Date: Mon, 12 Jun 2000 06:29:41 -0700 (PDT)
From: Charlie Kohler <charliesiv@yahoo.com>
Subject: Monday Morning QB
To: John Wright <jwrightdo@worldnet.att.net>
Cc: Lancair List <lancair.list@olsusa.com>
Mime-Version: 1.0

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""Charlie,  Any ideas why this would happen?  Does
this imply that engine out practice should be done 
infrequently? Also, Whats your opinion on pressure
testing iv-p's to 7.5psi or so on the ground, good
idea or not?  If so how do you get the door seal
inflated with the door locked? and how do you verify
what the cabin pressure is from the outside?  Thanks,
John""
Hi John,
I would only advocate a practice simulated "power out"
during a annual recurrency check. Less than 10" is not
good on thrust bearings. 
But, In a "die out" at IDLE throttle position-- one
would normally think engine loaded up on the rich end.
Only way to clear it is to add throttle--air-- and the
proper mixture. 
 His analysis of his situation is good- and I believe
it would have worked had he tried it. Going back to 
the original problem and why did it happen to begin
with--. The applicable questions are;
1. Was fuel pump left on below 10,000 ft?
2. Was low end unmetered fuel pressure 7-9 psi?
3. Was idle mixture 50 rpm rich?
4. Was Idle speed set @ 600 rpm?

Second Question,
No I do not believe 7.5 psi testing is required to
have a safe airframe. IMHO 6.5, is far enough beyond
the operational limits to give an adequate test.
Were you doing design testing-- I'de pump it up to
failure and see where the weakest link is. But, We
already know that some airframes have door windows
that were the weakest link. Latch mount holes/ and
poor glue adhesion between window and frame seem to be
the main factors. If done properly, I suspect it would
go 100% over operating pressure-- but I'm not going to
try it on mine!
 
Third Question,Door seal SW. 
This is my method. 
1. Disconnect master relay positive lead.
2. turn on master sw.
3. instant glue a nylon thread to the end of the door
seal switch lever  
4. place sw in on position.
5. route thread under door seal to be able to pull
from outside door and turn off sw (Deflating seal).
6. close and latch door/ 
7. connect master sw lead. Seal should pump up.
Use hose from elevator pressure compensator and extend
to safe distance for gage.
When done -- disconnect master sw and pull thread. If
thread comes off or won't work--- take rest of day off
and come back tomorrow. It should deflate in a day or
two.

Charlie K. 


=====
Charlie Kohler
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