TEST CENTER WINDSHIELD ANTI-FOGGING ELEMENT (Continued)

TM 55-1520-240-23-10 12-2 TEST CENTER WINDSHIELD ANTI-FOGGING ELEMENT (Continued) 12-2 PILOT’S OR COPILOT’S WINDSHIELD SENSING ELEMENT NOTE Sensing element is embedded in windshield. Windshield must not be in direct sun when reading temperature on FAT thermometer. Procedure is same to test pilot’s or copilot’s windshield. Pilot’s windshield is shown here. 7. Remove screw (1), lockwasher (2), and flat washer (3) from terminal (10). Disconnect wire (11). 8. Measure resistance between terminals (10 and 12). Resistance shall be as below for windshield temperature. If Temperature is: Resistance Shall Be: (ohms) 31º to 40ºC (87º to 104ºF) 318-340 21º to 30ºC (69º to 86ºF) 305-330 11º to 20ºC (51º to 68ºF) 289-321 1º to 10ºC (33º to 50ºF) 275-310 -9º to 0ºC (15º to 32ºF) 259-301 -19º to -10ºC (-3º to 14ºF) 245-290 -29º to -20ºC (-21º to -4ºF) 228-282 9. Connect wire (11) to terminal (10). Install flat washer (3), lockwasher (2), and screw (1). 12-8