X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 03 Oct 2012 14:20:33 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTP id 5791767 for lml@lancaironline.net; Wed, 03 Oct 2012 14:12:03 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=Sky2high@aol.com Received: from mtaomg-ma04.r1000.mx.aol.com (mtaomg-ma04.r1000.mx.aol.com [172.29.41.11]) by imr-ma05.mx.aol.com (8.14.1/8.14.1) with ESMTP id q93IBGkn005848 for ; Wed, 3 Oct 2012 14:11:21 -0400 Received: from core-mte003b.r1000.mail.aol.com (core-mte003.r1000.mail.aol.com [172.29.236.73]) by mtaomg-ma04.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 116E3E0000A6 for ; Wed, 3 Oct 2012 14:11:21 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Wed, 3 Oct 2012 14:11:20 -0400 (EDT) Subject: Re: [LML] Alternate Static Requirement X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_d9c9.5c8871f1.3d9dd9c7_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:442794336:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d290b506c7fc95b62 --part1_d9c9.5c8871f1.3d9dd9c7_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit 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 --part1_d9c9.5c8871f1.3d9dd9c7_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Uh, Lancairs are not approved for operation in known icing=20 conditions..

Grayhawk

In a message dated 10/3/2012 1:05:08 P.M. Central Daylight Time,=20 dave.saylor.aircrafters@gmail.com writes:

=

FAR 23.1325 Static pressure system.

(b)(3) If a static pressure system is provided for any instrument, dev= ice,=20 or system required by the operating rules of this chapter, each static=20 pressure port must be designed or located in such a manner that the=20 correlation between air pressure in the static pressure system and true= =20 ambient atmospheric static pressure is not altered when the airplane=20 encounters icing conditions. An antiicing means or an alternate source of= =20 static pressure may be used in showing compliance with this requirement. = If=20 the reading of the altimeter, when on the alternate static pressure syste= m=20 differs from the reading of the altimeter when on the primary static syst= em by=20 more than 50 feet, a correction card must be provided for the alternate s= tatic=20 system.

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

The way I read this is that if you don't have a heated static port, an= d=20 there's any chance that ice will block your static port, you need an alte= rnate=20 static, VFR or IFR. I know this seems to apply to "normal, utility,= =20 etc., and not experimentals, but your op limits will say you need a stati= c=20 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 lin= e=20 would freeze at altitude. Utterly VFR but an alternate static sourc= e=20 still would have come in handy.

McMaster-Carr makes an nice little valve (P/N 6791T21) that looks like= a=20 toggle switch that fits the bill nicely. It's about $15.

Dave Saylor

831-750-0284=20 CL

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