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graeme bird
Joined: 15 Jul 2010
Posts: 434
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 Posted: Wed Feb 21, 2018 6:16 am Post subject: Alternate static port & Switch |
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I put in MOD 2 for my heated pitot tube and one of the points that came back was that i'd need to be able to select an alternate static port. Has anyone used a natty panel mount widget/switch for this which connects to 6mm pvc tubing?
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Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk |
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BobD
Joined: 05 Jan 2016
Posts: 112
Location: Sheffield UK
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| Posted: Wed Feb 21, 2018 3:51 pm Post subject: Re: Alternate static port & Switch |
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Graeme, I used one of these, panel mounted, to give me an alternate static port. It took a while to arrive, but I think you can get them quicker from the UK for about £25
https://www.ebay.co.uk/p/Tv-3s-2position-2-Way-Air-Pneumatic-Knob-Control-on-off-Toggle-Valve-Silver-M1l8/1185735205
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Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3 |
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ploucandco
Joined: 16 Sep 2007
Posts: 69
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| Posted: Thu Feb 22, 2018 3:34 am Post subject: Re: Alternate static port & Switch |
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I have this one that is waiting for install:
https://www.steinair.com/product/pitot-static-toggle-switch/
Basically the same as Bob is using.
By the way, Bob, do you have a reference of an adapter 1/8 NPT Female to hose?
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John Wighton
Joined: 18 May 2010
Posts: 241
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| Posted: Thu Feb 22, 2018 3:57 am Post subject: Re: Alternate static port & Switch |
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The alternate static source when switched with this type of (2 way switch) will supplement the original static source - not replace it.
A 3-way switch which selects from either Source A or Source B seems to be a requirement for some aircraft (l know this may not be applicable to the LAA).
Looking at the nice diagrams in FAA AMT Vol2 Figure 10-25 shows a 3-way switch. See attachment.
Is a 2-way switch acceptable?
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John Wighton
Europa XS trigear G-IPOD |
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BobD
Joined: 05 Jan 2016
Posts: 112
Location: Sheffield UK
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| Posted: Thu Feb 22, 2018 3:49 pm Post subject: Re: Alternate static port & Switch |
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ploucandco, I have searched through my records, and I think this is where I sourced the adapter:
https://www.ebay.co.uk/itm/6mm-Pipe-Connector-Pneumatic-Straight-Push-In-Male-Stud-BSPT-Fittings-Air-Water-/201861291163
The desription on my Invoice is;
6mm Pipe Connector Pneumatic Starigh push in male
Stud BSPT Fitting air water
Size: 1/8"
John, I have attached the diagram I submitted to the LAA for approval of my Static/Pitot/AOA plumbing. The alternate static is cabin air from behind the Control Panel, to be used if the original source (under wing static) becomes blocked.
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Static_Pitot_AOA_plumbing.pdf |
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Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3 |
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carlp101
Joined: 07 Mar 2016
Posts: 120
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| Posted: Fri Mar 02, 2018 4:19 am Post subject: Re: Alternate static port & Switch |
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Being an aircraft that does not have the ability to be configured with a pressurised cockpit, I've often wondered why people route static ports to the outside world instead of just leaving the static port unconnected behind the panel? I discussed this recently with the LAA and they didn't see and issue with leaving them unconnected in non-pressurised aircraft.
Thoughts?
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