Several of our guys (including me) have
junked our mechanical pressure switches and moved to solid state adjustable
switches.
http://www.automationdirect.com/adc/Search/Search?searchquery=PSD25-OP-5800H&cmd=Search&fctype=adc.falcon.search.SearchFormCtrl&TxnNumber=-1
-----Original Message-----
From: Lancair Mailing List
[mailto:lml@lancaironline.net] On Behalf Of Don
Gordon
Sent: Monday, February 07, 2011
7:45 AM
To: lml@lancaironline.net
Subject: [LML] LNC2 Hydraulic
Landing Gear Pressure Switch Wear Issues
I have recently
replaced both my high pressure and low pressure switches in the hydraulic
system for the landing gear. These switches began to have trouble
providing a positive and discrete on/off event when the hydraulic pressure
reached the prescribed limits. I began to hear strange crackling and
static noises in my headset just prior to the hydraulic pump running (though it
would just run for a fraction of a second to re-pressurize). These
strange sounds in my headset began to occur longer and longer prior to the pump
tripping on. I also began to notice some other odd electrical issues with
the aircraft. Finally, I began to suspect these switches were faulty are
replaced both of them. The problem went away and so did my electrical
issues I experienced.