On Tuesday, November 26, 2019 at 12:01:59 PM UTC-8, wrote:
The STC approved Peregrine squat switch required for use with the Trig TN70 is $125.00 from Aircraft Spruce & Specialty. https://www.aircraftspruce.com/catal...it10-05913.php

It has been mentioned a cheaper pneumatic squat switch could be used if intended for an experimental glider running the TT22/TN72 combo.

Please identify suitable "experimental" pneumatic squat switches.

Thanks.

http://www.craggyaero.com/transponder.htm


To confirm correct operation while sitting on ground, turn the transponder mode knob to alt and the display should say grd, then you can increase pitot pressure to above the stall speed setting and the transponder display will switch to alt.

If you fly in wave without this switch your ground speed may be very low and ATC will think you are on the ground.

AIR PRESSURE SWITCH/Normally open, 42 knots, adjustable.

$48.50

Richard
www.craggyaero.com