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Date:  1-25-2017
Number of Hours:  5.00
Manual Reference:  
Brief Description:  ASI check

1) Here I have connected tubing to the air speed pitot sensor, and have run surgical tubing into the cockpit area for the tests,

2)This is my manometer set...home made...and the design comes from several articles in 'Sport Aviatiion" a number of years ago (2007?), and from Kevin Horton at 'kilohotel.com'. The design construction isnt hard to understand, but the math had me a bit confused as I had forgotten the computer notation for a number that needed to be squared, and that is where Kevin came to my rescue. Thanks much Kevin!

The operation is simple. Manometer fluid is stabilized about half way up both tubes. The system airspeed sensor..pitot tube...is connected to the closed side of the'u 'tube, and the pressure source is 'tee' into the sensor/airspeed line. When we VERY gently apply small incremental pressure (via mouth) to the 't' input, both the airspeed indicator and the ambient air side of the manameter tube will rise. The aforementioned math will lay out a non linear scale that gives either knotts or mph relative to inches of water displaced within the manometer tubes. By measuring the distance between the opposite levels of the fluid, one can come up with the 'inches of water' displacement and the associated airspeed that whould be indicated on the aircraft insturment. Doing this for several displacements can yield a sense of the insturments leinarity, which should be a non issue unles the instrument has problems. System leakage can and should also be tested by pinching the surgical tubing off and watching for how long it takes for changes to appear in the readings. A minuet or so dosent appear to be bad..
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connection

connection

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set up

set up

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