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Safety-Trim Air Speed Switch Question

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rnewman(at)tcwtech.com
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Posted: Thu Feb 14, 2008 3:29 pm Post subject: Safety-Trim Air Speed Switch Question

The answer is YES, plumbing to static line is important, especially if you  have your airplane tested for the pitot static test to fly IFR.  The test  equipment can ruin any piece of equipment that is only connected to  one of the lines.   The test draws a vacuum on  both lines simulating a rise in altitude.   With both lines (pitot and  static) connected to the test rig the net differential pressure from pitot  to static is near zero and everything is fine.  However, with only one line  connected the vacuum is drawn across any instrument connected to only one  line.   There's a great chance of ruining the instrument connected to  only one line.  I know first hand.  I had to pay for the rebuild of my  airspeed indicator when the pitot line got disconnected during the test!   Bang.   



So please connect both lines to the Air Speed  Switch!



Bob Newman

TCW Technologies.  

 www.tcwtech.com

 

 

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flagstone(at)cox.net
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Posted: Thu Feb 14, 2008 5:21 pm Post subject: Safety-Trim Air Speed Switch Question

Bob:

  

 That's interesting and good to know.  I was  also planning on an airspeed switch and was wondering the same thing as  Gary.   Couple questions??  Do you have to install special ports  for the equipment to hook up to or will it hook up to the pitot tube and  static ports (two) as installed??  Does the system test an  alternate static port operated from inside the cabin as well??  Do you know  why TruTrak would say its fine to just vent the static port for  their ADI to the cabin??  That instrument is usually a backup for IFR  so one would think that TruTrak would expect to have the pitot/static  systems tested. 

  

 Thanks

  

 Mark

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rnewman(at)tcwtech.com
Guest

Posted: Thu Feb 14, 2008 7:52 pm Post subject: Safety-Trim Air Speed Switch Question

Our Air Speed Switch  (ASW-1) connects into  your standard pitot and static system,   you just need to "T" into  each of the respective lines.     Using it with an alternate  source of static pressure from inside the cabin is not an issue.  Under all  normal cases that static source is closed off,  when the Static test  performed it certainly checks to ensure that the alternate static source doesn't  leak.   If you ever use your alternate source in actual  conditions the pitot and static system will already be close in differential  pressure so no issue.    The only problem I know of is  during the Static Test when your airplane is sitting on the ground, but the test  equipment takes your pitot and static lines up to 20,000  ft.     Regarding the recommendations of other manufacturers  I can only speculate,  so don't take this to the bank.     But perhaps they are using a solid-state pressure transducer that can withstand  large differential pressures.   The real problem is for transducers or  instruments with some sort of diaphragm mechanism.

  

  

 Bob Newman

 TCW Technologies

 www.tcwtech.com

  

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ricksked(at)embarqmail.co
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Posted: Thu Feb 14, 2008 8:35 pm Post subject: Safety-Trim Air Speed Switch Question

Bob, 

Glad to see your on the list...keeping us honest. I have not received mine yet...hopefully in  few weeks. I opted forthe speed switch as well. Good info regarding the pressure balance on pitot/static checks.  

Rick Sked 

40185

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