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moe(at)rosspistons.com
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 Posted: Mon Jul 30, 2007 11:40 am Post subject: Pressurization Control Panel |
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[img]cid:image001.gif(at)01C7D2A7.3F90E3E0[/img] 625 S. Douglas, El Segundo, CA 90245 $B!|(B Phone: (310) 536-0100 Fax: (310) 536-0333
moe(at)rosspistons.com (moe(at)rosspistons.com)
Gents:
Does anyone have a schematic or information on how the Cabin Pressure Controller works in a 680F(p)? This same unit was used in about all pressurized Commanders (I think). This is the unit attached to the Pressurization Control Panel (not the Barber Coleman unit in the rear).
Recently, the more cabin air leaks that have been sealed the worse the pressurization has gotten, to the point that now the pressure differential is only 1.5 PSI. Using a slack tube manometer and the procedure in the book it has been determined that the problem is either (A) a leaky tube going to the outflow valve (not likely) (B) a defective outflow valve or (C) a defective Pressure Controller. The pressure is definitely getting out through the outflow valve (it was checked in flight and on the ground). The problem is that I can$B!G(Bt decide if the Pressure Controller is holding the outflow valve open or is the problem with the outflow valve its self. It would probably be easier to remove one of the engines than it would be to remove the outflow valve, so the preferred method would be to check the Cabin Pressure Controller first.
Any and all suggestions will be greatly appreciated.
Moe Mills
N680RR
680F(p)
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BillLeff1(at)aol.com
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| Posted: Mon Jul 30, 2007 10:09 pm Post subject: Pressurization Control Panel |
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Moe Call me about this problem.
Bill Leff
937-369-3334
Get a sneak peek of the all-new AOL.com.
[quote][b]
| | - The Matronics Commander-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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moe(at)rosspistons.com
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| Posted: Mon Aug 06, 2007 6:01 am Post subject: Pressurization Control Panel |
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Hi Bill,
Using your suggestion, I taped off the two static ports by the pilot’s window & copilot’s window and pressurized on the ground, and sure enough the maximum differential that I could get was 1.5, which is the same that I got with the static ports not taped. When the outflow valve was blocked off the pressure went up to 2.8 quickly, regardless of whether the static ports were taped off or not.
It appears that it is time to replace the outflow valve.
Thanks very much for the helpful advice the other day on the phone. I certainly do appreciate it.
Best regards,
Moe Mills
From: owner-commander-list-server(at)matronics.com [mailto:owner-commander-list-server(at)matronics.com] On Behalf Of BillLeff1(at)aol.com
Sent: Monday, July 30, 2007 11:08 PM
To: commander-list(at)matronics.com
Subject: Re: Commander-List: Pressurization Control Panel
Moe Call me about this problem.
Bill Leff
937-369-3334
Get a sneak peek of the all-new AOL.com.
| Quote: | | http://www.matronics.com/Navigator?Commander-List |
01234
[quote][b]
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BillLeff1(at)aol.com
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| Posted: Wed Aug 08, 2007 1:30 pm Post subject: Pressurization Control Panel |
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Anytime!
Bill
Get a sneak peek of the all-new AOL.com.
| | - The Matronics Commander-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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