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CloudCraft(at)aol.com
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 Posted: Wed Sep 27, 2006 9:43 am Post subject: Pneumatic Pressure Guage |
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In a message dated 27-Sep-06 09:30:49 Pacific Daylight Time, tfisher(at)commandergroup.bc.ca writes:
| Quote: | | I think the gauge should have a dump valve immediately before the gauge just to dump what is in the gauge, in that way the needle would drop to zero and then back up to current pressure. The amount of loss might mean a quick top up every couple of months. |
Ted would be impressed, Tom.
Your idea has a very important (if not hidden) benefit. The dump valve could also reveal hydraulic fluid getting into the pneumatic system via a rupture in either outboard landing gear actuator.
This would also mean that nitrogen under pressure could work its way into the hydraulic side of a MLG actuator and hydrostatically lock it at worst, or slow down its operation, at least.
Until someone comes up with a purge valve for the pneumatic guage, it's a good idea to release some pressure via the Schraeder valve with a tissue held over it to chek for traces of hydraulic fluid.
Wing Commander Gordon
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tfisher(at)commandergroup
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| Posted: Wed Sep 27, 2006 9:56 am Post subject: Pneumatic Pressure Guage |
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Well my father (long gone now) used to always say when I came up with some idea "If it was a good idea, someone would have already thought of it", pretty sad eh?
I believe that it is expected to have Skydrol vapour in the nitrogen area because the O-rings specified for the nitrogen system are Skyrol O-rings tolerant.
Tom F.
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CloudCraft(at)aol.com
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| Posted: Wed Sep 27, 2006 10:40 am Post subject: Pneumatic Pressure Guage |
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In a message dated 27-Sep-06 11:00:44 Pacific Daylight Time, tfisher(at)commandergroup.bc.ca writes:
| Quote: | I believe that it is expected to have Skydrol vapour in the nitrogen area because the O-rings specified for the nitrogen system are Skyrol O-rings tolerant.
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I'm not sure that's true, but I am not a mechanic, nor am I an O-ring. The O-rings in the pneudraulic (outboard) actuators will have Skydrol on one side of them, so they'll need to be Skydrol tolerant.
If there's Skydrol tolerant O-rings further downstream in the pneumatic system, then, yes, there may be some fluid/condensation anticipated -- but beware of the nitrogen bottle collecting fluid.
I think there's guys here who know way more about the subtleties of this than I do ...
Wing Commander Gordon
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