X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: X-ListServer: CommuniGate Pro LIST 5.4.4 List-Unsubscribe: List-ID: List-Archive: Precedence: list Reply-To: "Lancair Mailing List" Sender: "Lancair Mailing List" To: lml@lancaironline.net Date: Fri, 16 Mar 2012 08:13:25 -0400 X-Original-Message-ID: From: Jack Morgan MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="Apple-Mail=_51171C9D-A25C-451D-9FC8-3411A8E8354C" Message-ID: Subject: [LML] Re: hydraulic pressure gauges --Apple-Mail=_51171C9D-A25C-451D-9FC8-3411A8E8354C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Adding complexity is never a good idea. I suggest not adding even the = transducer, tee, etc. At periodic inspection cycle the flaps and note = the time from pump start to pump stop as a check of the overall = condition of the pump and pressure switch and leave the complexity out. = I endorse your observation that knowing the hydraulic pressure will not = change your course of action in flight or any procedure to remedy the = outcome. It is important to have a panel indication that the pump is = operating since it will do so continuously should it not be able to = achieve cut off pressure. The panel run indication will also warn you if = the pump run time starts getting long. You get a feel for the run time = at each gear extension as a check of the pumps condition. The above pertains to the IV hydraulics so please don't blast me with = respect to other Lancair types. Jack Morgan LIV 4 P On Mar 16, 2012, at 6:00 AM, Lancair Mailing List wrote: > From: jeffrey liegner > Subject: Re: [LML] Re: hydraulic pressure gauges > Date: March 15, 2012 8:34:34 AM EDT > To: lml@lancaironline.net >=20 >=20 >=20 > After reviewing the options for tapping into the hydraulics, the = plumbing and the gauge, rather than having a gauge on the panel = somewhere, I'm now actually thinking I will place a transducer off the = hydraulic distribution manifold in the gear well. Then I would make = this an annual option (or periodic option), connecting a display gauge = to read the high-low. >=20 > I'm thinking that I don't need immediate and continuous monitoring of = the pressure. If the flaps or gear transit time slows, I will know = this. If the pressure is suddenly lost (catastrophic loss of = hydraulics), having the gauge won't tell me more than what I already = know...gear won't go down, flaps don't work. And having another high = pressure hose behind the panel invites a new leak. >=20 > Thoughts? >=20 --Apple-Mail=_51171C9D-A25C-451D-9FC8-3411A8E8354C Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1