Replacing an airspeed indicator

On Wednesday, March 5, 2014 11:15:35 AM UTC-7, Soartech wrote:
For some reason my glider came with an indicator with a ridiculously high maximum reading. I would like to replace it with something that has much more space in the most often used regions of the dial. Can you just install a new instrument or does it need to be somehow calibrated or tuned to an individual Pitot tube installation?

Thanks for your experience.

The ridiculously high reading should be a good excuse to fly faster (Kidding!). Check your maintenance manual and possibly the TDCS and there should be a list of approved instruments. You also have to make sure the A/S has the proper markings. Granted, If your ship is experimental you could possibly do anything you want as long as your mechanic signs off but I would not use a mechanic who would sign a condition inspection without properly marked instruments. Calibration is a good idea but it is complicated.