X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 03 Nov 2005 00:12:12 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m27.mx.aol.com ([64.12.137.8] verified) by logan.com (CommuniGate Pro SMTP 5.0) with ESMTP id 813014 for lml@lancaironline.net; Wed, 02 Nov 2005 23:31:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.8; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m27.mx.aol.com (mail_out_v38_r6.3.) id q.ee.1f781423 (4214) for ; Wed, 2 Nov 2005 23:30:23 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Wed, 2 Nov 2005 23:30:23 EST Subject: Re: [LML] Re: Lancair 320 gear problem -- help wanted X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1130992223" X-Mailer: 9.0 Security Edition for Windows sub 5009 X-Spam-Flag: NO -------------------------------1130992223 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/2/2005 9:04:44 P.M. Central Standard Time, marv@lancaironline.net writes: Scott, unfortunately I did not take this system out before sending to Colorado Composites to fix. (another mistake) All of these parts are long since gone. I did forget to mention that my CB does remove power from all of this system. For a time I pulled this breaker, during a flight, until I needed to move the gear. What would have caused the bubbles? If we have the press. switches in this circuit and I close the HP switch wont it open the low pressure switch since the press will be higher that the lo press switch setting? Don, Do you mean the 50 amp motor CB? Was the relay power circuit (power to the gear switch) source wired after the motor breaker? I.E. Pulling the Motor power breaker also removes power from the relay coil circuit? If so, what other changes from the Lancair wiring diagram existed? BTW, I am asking these questions so that if we can find the cause, we can hopefully prevent an event like this from ever occurring again. You asked about the bubbles - my test system is open and when it stops running, air enters the clear tubing. when the pump starts I can see which way the bubbles start going. After running a bit, the tube representing the selected direction is completely full of flowing fluid. You must re-think the pressure switches again. If the pressure is less than the desired end system pressure (up or down), then the switch is closed to allow current,if present, to pass to the associated relay coil. The only time any pressure switch is open is when the final desired pressure is reached thus ensuring that relay coil power is removed so that the pump stops running when the relay opens. Of course there is a pressure band of perhaps 100-200 psi below the target that the pressure switch remains open. So, once again, if the pump is running, both pressure switches are CLOSED because neither has reached the desired pressure. When the desired pressure is reached, then the correct switch can OPEN to then open the proper relay (remove coil power) and stop the motor from running. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------1130992223 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 11/2/2005 9:04:44 P.M. Central Standard Time,=20 marv@lancaironline.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Scott,=20 unfortunately I did not take this system out before sending to
Colorado= =20 Composites to fix. (another mistake)  All of these parts are=20 long
since gone. I did forget to mention that my CB does remove power f= rom=20 all of
this system. For a time I pulled this breaker, during a flight,=20 until I needed
to move the gear.
 
  What would have=20 caused the bubbles? If we have the press. switches in this
circuit and=20= I=20 close the HP switch wont it open the low pressure switch since
the pres= s=20 will be higher that the lo press switch setting?
Don,
 
Do you mean the 50 amp motor CB?  Was the relay power circuit= =20 (power to the gear switch) source wired after the motor breaker? =20 I.E. Pulling the Motor power breaker also removes power from the relay=20= coil=20 circuit?  If so, what other changes from the Lancair wiring diagram=20 existed?
 
BTW, I am asking these questions so that if we can find the cause, we c= an=20 hopefully prevent an event like this from ever occurring again.
 
You asked about the bubbles - my test system is open and when it stops=20 running, air enters the clear tubing. when the pump starts I can see which w= ay=20 the bubbles start going.  After running a bit, the tube representing th= e=20 selected direction is completely full of flowing fluid.
 
You must re-think the pressure switches again.  If the pressure is= =20 less than the desired end system pressure (up or down), then the switch is=20 closed to allow current,if present, to pass to the associated relay coil.&nb= sp;=20 The only time any pressure switch is open is when the final desired=20 pressure is reached thus ensuring that relay coil power is removed so t= hat=20 the pump stops running when the relay opens.  Of course there is a pres= sure=20 band of perhaps 100-200 psi below the target that the pressure switch remain= s=20 open.  So, once again, if the pump is running, both pressure switches a= re=20 CLOSED because neither has reached the desired pressure. When the desir= ed=20 pressure is reached, then the correct switch can OPEN to then open the=20 proper relay (remove coil power) and stop the motor from=20 running.   
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)



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