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From: Robert R Pastusek <rpastusek@htii.com>
To: Lancair Mailing List <lml@lancaironline.net>
Subject: RE: [LML] IVP Pressurized Door Seal and A/C Fans
Thread-Topic: [LML] IVP Pressurized Door Seal and A/C Fans
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Date: Mon, 29 Jul 2013 13:25:26 +0000
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Dennis,
On the door seal. Your description sounds like a slow leak.=20

Several things to check: you should have a 1-way valve in the system just d=
ownstream of the pressure pump. This keeps inflation air from back-flowing =
through the pump... Most pumps have a small amount of leakage built in to t=
hem, so the anti-backflow valve is important. Second, (CAREFULLY so as to n=
ot damage the tubing) pinch the pressure feed line closed as close to the d=
oor seal as possible and activate the pump. If it continues to cycle, your =
leak is between the pump and the clamp point. If it does not cycle, the lea=
k is in the door seal itself.  This one is a bitch to isolate, but you can =
do so by (again CAREFULLY) rigging jumper wires so you can inflate the seal=
 with the door open. This will open the leak and you'll be able to hear it.=
 You must be able to control the power on/off when doing this, as it's poss=
ible to literally blow up the seal if you over-do it, so some caution requi=
red.=20

This is what I did to isolate a pin-hole in my door seal...and it took me a=
 good period of time to find the hole, then somewhat longer to get it plugg=
ed. I was almost ready to replace the seal in frustration when I finally go=
t some 3M RTV sealant in the right spot, and BINGO, no more leaks. My door =
seal pump does not cycle at all any more...

Good Luck.

Bob

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Deni=
s Conkey
Sent: Sunday, July 28, 2013 10:57 PM
To: lml@lancaironline.net
Subject: [LML] IVP Pressurized Door Seal and A/C Fans

I know many of you have experience flying with the pressurized IV.  How oft=
en should the door seal pump engage after the pressure is up on the Seal?
Ours seems to have a very short cycle "on" about every 5-8 second.  The pum=
p runs a second or less when it cycles on.  Not having experience with the =
pump, seems like the cycle time should be a bit more than that which might =
be indicative of a slow leak.  We have checked for leaks in all our tube co=
nnections using soap bubbles and could not identify any leaks.  What is a g=
ood way to check for leaks?  Is it possible for the pump to be leaking inte=
rnally?  Any advice on this topic would be much appreciated. =20

We have an air conditioner unit and the fans in the cabin that draw in the =
air are very noisy.  They are 4 inch Attwood Turbo 4000 fans.  These fans a=
re estimated to be more than 5-6 years old but used very little.  I noticed=
 that Attwood has a Series II fan that might be quieter.  Are there other o=
ptions for fans that are not quite so noisy.  These will drive any backseat=
 passenger crazy and I fear will be quite noisy in the front as well.  If y=
ou know of any other 4 inch fans that would be well suited for this purpose=
 or if the Series II fans are better, please let us know.

Thanks,

Denis Conkey/Jim Thompson
Lancair IVPT - N750PJ
805-402-6197


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