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From: BILL HANNAHAN <wfhannahan@yahoo.com>
Subject: Dead landing gear LNC2
X-Original-To: MAIL LANCAIR <lml@lancaironline.net>
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  During construction I felt that the electrical gear circuitry had several potential failure modes, so I installed a heavy wire from the battery + terminal to a 40 amp self resetting circuit breaker, to a high current push button switch mounted on the baggage compartment bulkhead, to the down wire of the gear motor. 
   
  I can pull the 50 amp breaker and push the button to bypass most electrical failure modes. The push button switch is recessed in the bulkhead and covered by an aluminum plate and tape to avoid accidental activation by baggage impact.
   
  To test the pressure switch, connect a long piece of tubing to the pitot tube, bend it in half to create a metering orifice and blow gently into it while watching the airspeed indicator, with gear up selected (on jacks naturally). When the switch closes the gear should come up.



BILL HANNAHAN
WFHANNAHAN@YAHOO.COM


		
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<DIV id=RTEContent>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p>&nbsp;</o:p></SPAN></div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial"><o:p></o:p></SPAN>&nbsp;</div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial"><o:p>&nbsp;</o:p></SPAN></div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial">During construction I felt that the electrical gear circuitry had several potential failure modes, so I installed a heavy wire from the battery + terminal to a 40 amp self resetting circuit breaker, to a high current push
 button switch mounted on the baggage compartment bulkhead, to the down wire of the gear motor. <o:p></o:p></SPAN></div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial"><o:p>&nbsp;</o:p></SPAN></div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial">I can pull the 50 amp breaker and push the button to bypass most electrical failure modes. The push button switch is recessed in the bulkhead and covered by an aluminum plate and tape to avoid accidental activation by baggage impact.<o:p></o:p></SPAN></div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana; mso-bidi-font-family: Arial"><o:p>&nbsp;</o:p></SPAN></div>  <div class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 8pt; COLOR: #333333; FONT-FAMILY: Verdana;
 mso-bidi-font-family: Arial">To test the pressure switch, connect a long piece of tubing to the pitot tube, bend it in half to create a metering orifice and blow gently into it while watching the airspeed indicator, with gear up selected (on jacks naturally). When the switch closes the gear should come up.</SPAN></div></DIV><BR><BR>BILL HANNAHAN<br>WFHANNAHAN@YAHOO.COM<br><br><p>
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