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The system is “on” when the rocker switch is “up”. Note: This failure could prevent continued use of the headset in the “on” position. These loud tones and the related loss of communications can be eliminated for the duration of the flight simply by switching the headset off. (The system is off when the rocker switch is “down.”) With the switch off, the headset continues to function in the passive mode, maintaining full communication capabilities. We strongly recommend that as a responsible pilo