| Adding complexity is never a good idea. I suggest not adding even the transducer, tee, etc. At periodic inspection cycle the flaps and note the time from pump start to pump stop as a check of the overall condition of the pump and pressure switch and leave the complexity out. I endorse your observation that knowing the hydraulic pressure will not change your course of action in flight or any procedure to remedy the outcome. It is important to have a panel indication that the pump is operating since it will do so continuously should it not be able to achieve cut off pressure. The panel run indication will also warn you if the pump run time starts getting long. You get a feel for the run time at each gear extension as a check of the pumps condition.
The above pertains to the IV hydraulics so please don't blast me with respect to other Lancair types.
Jack Morgan LIV 4 P On Mar 16, 2012, at 6:00 AM, Lancair Mailing List wrote: Subject: Re: [LML] Re: hydraulic pressure gauges
Date: March 15, 2012 8:34:34 AM EDT
After reviewing the options for tapping into the hydraulics, the plumbing and the gauge, rather than having a gauge on the panel somewhere, I'm now actually thinking I will place a transducer off the hydraulic distribution manifold in the gear well. Then I would make this an annual option (or periodic option), connecting a display gauge to read the high-low.
I'm thinking that I don't need immediate and continuous monitoring of the pressure. If the flaps or gear transit time slows, I will know this. If the pressure is suddenly lost (catastrophic loss of hydraulics), having the gauge won't tell me more than what I already know...gear won't go down, flaps don't work. And having another high pressure hose behind the panel invites a new leak.
Thoughts?
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