General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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What does the window heat "INOP" light indicate?

  1. The system is functioning normally

  2. Overheat is detected or switch is OFF

  3. Window is clear of ice

  4. Normal operation but requires monitoring

The correct answer is: Overheat is detected or switch is OFF

The indication of the window heat "INOP" light being illuminated signifies that there is an issue with the window heating system. Specifically, it means that either an overheat condition has been detected, or the switch that controls the system is in the "OFF" position. This warning is essential for flight safety as it alerts the crew to a potential risk of ice accumulation on the windows, which can obstruct visibility. Therefore, the illumination of the "INOP" light prompts corrective action or further investigation to ensure that the window heat system is functioning properly. The other options may suggest conditions that do not correlate with an "INOP" indication. For instance, a normal function of the system would not be indicated by the "INOP" light being on, nor would the light indicate that the window is clear of ice or that normal operation is taking place without an issue that requires monitoring.

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