X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 04 Oct 2012 08:43:29 -0400 Message-ID: X-Original-Return-Path: Received: from mail-da0-f52.google.com ([209.85.210.52] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5791879 for lml@lancaironline.net; Wed, 03 Oct 2012 14:59:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.52; envelope-from=pjdmiller@gmail.com Received: by dakf10 with SMTP id f10so2203261dak.25 for ; Wed, 03 Oct 2012 11:59:00 -0700 (PDT) Received: by 10.68.116.232 with SMTP id jz8mr15291117pbb.77.1349290740277; Wed, 03 Oct 2012 11:59:00 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.1.105] (S010620aa4b008706.cg.shawcable.net. [174.0.117.10]) by mx.google.com with ESMTPS id qq9sm3005389pbb.24.2012.10.03.11.58.58 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 03 Oct 2012 11:58:59 -0700 (PDT) From: Paul Miller Content-Type: multipart/alternative; boundary="Apple-Mail=_CFBA6100-8BF2-466E-BD95-683AFC4ED798" X-Original-Message-Id: Mime-Version: 1.0 (Mac OS X Mail 6.1 \(1498\)) Subject: Re: [LML] Re: Alternate Static Requirement X-Original-Date: Wed, 3 Oct 2012 12:58:57 -0600 References: X-Original-To: "Lancair Mailing List" In-Reply-To: X-Mailer: Apple Mail (2.1498) --Apple-Mail=_CFBA6100-8BF2-466E-BD95-683AFC4ED798 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Uh, you don't have to fly in icing conditions to freeze the static port. = Just water in the lines from rain and flying above the freezing level = will sort of do that. Uh. Paul Calgary (snowing today at ground level and eligible for taxiing in icing = conditions) On 2012-10-03, at 12:20 PM, Sky2high@aol.com wrote: > Uh, Lancairs are not approved for operation in known icing = conditions.. > =20 > Grayhawk > =20 > In a message dated 10/3/2012 1:05:08 P.M. Central Daylight Time, = dave.saylor.aircrafters@gmail.com writes: > FAR 23.1325 Static pressure system. >=20 > (b)(3) If a static pressure system is provided for any instrument, = device, or system required by the operating rules of this chapter, each = static pressure port must be designed or located in such a manner that = the correlation between air pressure in the static pressure system and = true ambient atmospheric static pressure is not altered when the = airplane encounters icing conditions. An antiicing means or an alternate = source of static pressure may be used in showing compliance with this = requirement. If the reading of the altimeter, when on the alternate = static pressure system differs from the reading of the altimeter when on = the primary static system by more than 50 feet, a correction card must = be provided for the alternate static system. >=20 > ****************************************************** >=20 > The way I read this is that if you don't have a heated static port, = and there's any chance that ice will block your static port, you need an = alternate static, VFR or IFR. I know this seems to apply to "normal, = utility, etc., and not experimentals, but your op limits will say you = need a static check per part 43 appendix E, which then refers back to = part 23. >=20 > We had an a customer's plane go all goofy when water in the static = line would freeze at altitude. Utterly VFR but an alternate static = source still would have come in handy. >=20 > McMaster-Carr makes an nice little valve (P/N 6791T21) that looks like = a toggle switch that fits the bill nicely. It's about $15. >=20 > Dave Saylor >=20 > 831-750-0284 CL --Apple-Mail=_CFBA6100-8BF2-466E-BD95-683AFC4ED798 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii Uh, you don't have to fly in icing conditions to freeze the static port.  Just water in the lines from rain and flying above the freezing level will sort of do that. Uh.

Paul
Calgary (snowing today at ground level and eligible for taxiing in icing conditions)
On 2012-10-03, at 12:20 PM, Sky2high@aol.com wrote:

Uh, Lancairs are not approved for operation in known icing conditions..
 
Grayhawk
 
In a message dated 10/3/2012 1:05:08 P.M. Central Daylight Time, dave.saylor.aircrafters@gmail.com writes:
FAR 23.1325   Static pressure system.

(b)(3) If a static pressure system is provided for any instrument, device, or system required by the operating rules of this chapter, each static pressure port must be designed or located in such a manner that the correlation between air pressure in the static pressure system and true ambient atmospheric static pressure is not altered when the airplane encounters icing conditions. An antiicing means or an alternate source of static pressure may be used in showing compliance with this requirement. If the reading of the altimeter, when on the alternate static pressure system differs from the reading of the altimeter when on the primary static system by more than 50 feet, a correction card must be provided for the alternate static system.

******************************************************

The way I read this is that if you don't have a heated static port, and there's any chance that ice will block your static port, you need an alternate static, VFR or IFR.  I know this seems to apply to "normal, utility, etc., and not experimentals, but your op limits will say you need a static check per part 43 appendix E, which then refers back to part 23.

We had an a customer's plane go all goofy when water in the static line would freeze at altitude.  Utterly VFR but an alternate static source still would have come in handy.

McMaster-Carr makes an nice little valve (P/N 6791T21) that looks like a toggle switch that fits the bill nicely.  It's about $15.

Dave Saylor

831-750-0284 CL

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