X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 07 Nov 2007 15:11:16 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2460106 for lml@lancaironline.net; Wed, 07 Nov 2007 11:42:43 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.3.) id q.cb4.2107a819 (48600) for ; Wed, 7 Nov 2007 11:41:59 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Wed, 7 Nov 2007 11:41:58 EST Subject: Re: [LML] Re: Design for Circuit Breakers & Fuses? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1194453718" X-Mailer: AOL 9.0 VR sub 5006 X-Spam-Flag: NO -------------------------------1194453718 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en In a message dated 11/7/2007 8:47:06 A.M. Central Standard Time, =20 rpastusek@htii.com writes: You have a good point if you intend/need to troubleshoot while still in the= =20 air. As I noted in my original post, many years of doing this in military=20 fighters (as a weapon systems operator=E2=80=94with a well qualified pilot=20= still flying=20 the jet and typically swearing because his xyz was not working) convinced m= e=20 that this was (in my experience) a totally pointless exercise. I=E2=80=99m=20= pretty=20 sure I never recovered a system by resetting a CB, and I once caused a fire= in=20 the cockpit, and killed a generator another time. Still, I=E2=80=99ve heard= that=20 others have successfully recovered systems by resetting CB=E2=80=99s. So in= the end, you=20 make your own tradeoffs/decisions. Everything is a compromise at some leve= l=E2=80=A6 Bob, =20 You are correct about the flight regime but I find certain breakers very=20 useful during maintenance, especially if the Master Switch must be on durin= g the=20 work or for certain testing. =20 1. Hydraulic pump breaker (and the relay inline fuse wired after the=20 breaker). This eliminates the pump running or relays be being selected whe= n one=20 doesn't want it operating. =20 2. TC breaker - reduces load on battery when checking other things =20 3. Alt field breaker - reduces load. =20 4. Certain electronic flight instruments - reduces load. =20 5. Certain avionics components (no on-off switch) can be excluded. =20 Interestingly, occasionalIy have a use for the Facet pump (aux tank to=20 header) breakers in flight with the automatic keep-the-header-full engaged.= I can=20 disable one of the pumps for a while in order to balance the mistake of=20 mis-fueling the aux tanks - more fuel in one than the other. =20 I certainly like fuses for most circuits - mine are accessible only if I=20 remove the glare shield - a minor hassle. =20 Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Darwinian culling phrase: Watch This! ************************************** See what's new at http://www.aol.com -------------------------------1194453718 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
In a message dated 11/7/2007 8:47:06 A.M. Central Standard Time,=20 rpastusek@htii.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#1f497d size= =3D2>

 
2. TC breaker - reduces load on battery when checking ot= her=20 things
 
3. Alt field breaker - reduces load.
 
4. Certain electronic flight instruments - reduces=20 load.
 
5. Certain avionics components (no on-off switch) can be= =20 excluded.
 
Interestingly, occasionalIy have a use for the Facet pum= p (aux=20 tank to header) breakers in flight with the automatic keep-the-header-f= ull=20 engaged.  I can disable one of the pumps for a while in order to balanc= e=20 the mistake of mis-fueling the aux tanks - more fuel in one than the=20 other.
 
I certainly like fuses for most circuits - mine are acce= ssible=20 only if I remove the glare shield - a minor hassle.
 
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Darwinian culling phrase: Watch=20 This!



See what's ne= w at AOL.com a= nd Make AOL Your Homepage.
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