What was found
THE AIRSPEED INDICATOR WAS FOUND TO HAVE A CRACKED GLASS FACE WHEN CONDUCTING A PITOT STATIC LEAK TEST AFTER A TRANSPONDER INSTALLATION. IT APPEARS THAT THE PART IS MADE FROM A POLY-CARBONATE MATERIAL AND NOT GLASS. THE AIRSPEED IS LIGHTED AND IT APPEARS THAT THE LIGHT IS HEATING THE POLY=CARBONATE AND CAUSED THE CRACK. THE CRACK IS RIGHT AT THE LOCATION THAT THE LIGHT IS PLACED. THIS CONDITION HAS BEEN SEEN ON OTHER INSTRUMENT MADE FROM THE SAME MANUFACTURER.