An alternative to cracking the line and getting hyd fluid out is to carry your trusty metal jumper.  A screwdriver for example could be used to short across the pressure switch.  That momemtary short will twitch the spool valve enough to get things going again.  I prefer the dry sparking approach over the red goo.  I’ve heard it can even be done airborne.  There are those who would go so far as to install a secret switch behind the panel that would do the same thing (bypass the pressure switch).  To each his own.

 

Larry Henney

N360LH

800 hrs (two occurrences of this particular anomaly)

 

 

Hello all,

Just wanted to say thanks for all the input into my gear pump problem.  I received 4 comments about the pressure probably being above the limit set on the up-limit switch (1200lbs), preventing my pump from turning on and raising the gear.  I went to the airport on Friday to crack one of the lines open to relieve excess pressure.  But before I did this, I turned my master on and the pump burped, indicating the pressure had relieved itself.

Thanks for all the help.  I'll carry a set of wrenches and a rag in case this happens again.  It only happened once in 2 years of flying.  From now on, I'll verify that the pump runs during my preflight.  And after I shut down, I'll open- then close the dump valve to relieve static pressure.

Thanks for all the help.  Marv, thanks for running this service for us. The assistance is invaluable. 

Jim Gigliotti

Lancair 320, 400 hrs.
Dothan Alabama

 

-----Original Message-----
        From: Gigliotti, James M CTR USA <james.gigliotti@us.army.mil>
        To: lml@lancaironline.net
        Sent: Fri, 4 Apr 2008 10:53 am
        Subject: [LML] Landing Gear pump inop
       
       
        Hmm.  I hope I can make it to Sun N Fun!  I went out for a short hop last night, and my gear didn't come up.  Back on the ground, I recognized that the pump won't run in either direction.  With the dump valve open, it should run continuously, but it doesn't. 

        I don't think this will be a big problem, but I sure don't have much time over the next week to figure this out.  I'm posting this with hopes someone on the list can help point me in the right direction, and save me lots of time troubleshooting.  I suppose the problem must be in the switch, power supply, or continuity through either of my two circuit breakers.  Please respond directly to my email address.

        Thanks for any suggestions...
        Jim Gigliotti
        Lancair 320, 400 hrs.
        N91LS
        Dothan Alabama
        334-701-4580