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I was happily flying along in a club glider years ago when my airspeed indicator went south. Radioed the field that I was coming back and would be carrying a bit of extra speed. Landed okay, and upon inspection found an insect in the pitot tube. Mother Nature makes an insect that fits perfectly in every size opening of every machine.
Same (sort of) happened to me in an F-5 back in 1986, while doing an FCF test flight. I called up a pair of guys, who were headed back to Nellis, and shot a formation approach and landing. Still a weird feeling trying to fly AOA and wind noise levels, for speed gouge. no insect, just a failure of some diaphram, IIRC