X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 22 Aug 2005 07:04:38 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 5.0c1) with ESMTP id 676807 for lml@lancaironline.net; Sun, 21 Aug 2005 15:21:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.136; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d20.mx.aol.com (mail_out_v38_r4.1.) id q.1ed.42773384 (3310) for ; Sun, 21 Aug 2005 15:20:35 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <1ed.42773384.303a2e03@aol.com> X-Original-Date: Sun, 21 Aug 2005 15:20:35 EDT Subject: Re: [LML] bad gear switch? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1124652035" X-Mailer: 9.0 Security Edition for Windows sub 5009 X-Spam-Flag: NO -------------------------------1124652035 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 8/21/2005 1:27:00 P.M. Central Standard Time, sportform@cox.net writes: In the last 20 hours of flying my Legacy I have now had 2 occasions where the gear would not extend via the gear switch. Flip down....nothing. Recycle....nothing. Recycle...nothing. Slow to 90 knots and prayerfully turn the gear dump switch...voila! After landing I can hear the pump running, so it's fine. Both times this has happened I have been "on the road" (of course!). I have lifted off with much trepidation knowing that I might have to fly home with the gear down...but then the problem goes away and the gear works fine. Seems to me I have a switch problem. What say you? Barry, Probably not the switch. Of course there would have been no reason for you to read the LNC2 e-mails over the last few years but the Legacy hydro-electric gear system is very similar. So are the problems that can arise. You might want to search the archives for LNC2 gear related issues. Your situation might be related to the pressure switches, the pump shuttle valve installed backwards, damaged relays, back pressure faking out the pressure switch so that it thinks it has reached the right pressure, pressure switches not set high enough, etc. But, probably not the switch that controls the relays. From your description, it does not sound like you are following the emergency gear down check list. If you don't pull the breaker(s), after the pressure is relieved the pump will continue to run until the cows come home - this is not good nor is it applying any pressure to the actuators and, if it is wired correctly, might even cause the pump thermal circuit to open the selected relay but apparently that is not the case. When this happens in flight have you just tried to momentarily crack open the dump valve and return it to the closed position to relieve the possible back pressure while the gear switch is in the down position? When the pump is running does your "gear in transition" light come on? If so, when you opened the dump valve (assuming you did not pull the breakers) did the light come on? Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------1124652035 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 8/21/2005 1:27:00 P.M. Central Standard Time,=20 sportform@cox.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>In the=20 last 20 hours of flying my Legacy I have now had 2 occasions
where the= =20 gear would not extend via the gear switch. Flip=20
down....nothing. Recycle....nothing. Recycle...nothing.&nb= sp;=20 Slow to 90
knots and prayerfully turn the gear dump switch...voila!&nb= sp;=20 After landing
I can hear the pump running, so it's fine.

Both t= imes=20 this has happened I have been "on the road" (of course!). I
have= =20 lifted off with much trepidation knowing that I might have to fly
home= =20 with the gear down...but then the problem goes away and the gear
works= =20 fine.

Seems to me I have a switch problem. What say=20 you?

Barry,

Probably not the switch. Of course there would have been no reaso= n=20 for you to read the LNC2 e-mails over the last few years but the Legacy=20 hydro-electric gear system is very similar. So are the problems that c= an=20 arise. You might want to search the archives for LNC2 gear related=20 issues.

Your situation might be related to the pressure switches, the pump shut= tle=20 valve installed backwards, damaged relays, back pressure faking out the pres= sure=20 switch so that it thinks it has reached the right pressure, pressure switche= s=20 not set high enough, etc. But, probably not the switch that controls t= he=20 relays.

From your description, it does not sound like you are following the=20 emergency gear down check list. If you don't pull the breaker(s),= =20 after the pressure is relieved the pump will continue to run until the cows=20= come=20 home - this is not good nor is it applying any pressure to the=20 actuators and, if it is wired correctly, might even cause the pump ther= mal=20 circuit to open the selected relay but apparently that is not the case.

When this happens in flight have you just tried to momentarily crack op= en=20 the dump valve and return it to the closed position to relieve the possible=20= back=20 pressure while the gear switch is in the down position?

When the pump is running does your "gear in transition" light come=20 on? If so, when you opened the dump valve (assuming you did not pull t= he=20 breakers) did the light come on?=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

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