Which switch is used to test all RCU lights?

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Multiple Choice

Which switch is used to test all RCU lights?

Explanation:
Lamp Test is used to verify every indicator on the RCU by lighting all lamps at once. This diagnostic check lets you see if any indicator is burned out or dim, ensuring the status lights are reliable before use. It’s separate from normal operation and doesn’t affect how the RCU runs in service. The other options serve different functions: powering on simply applies power, resetting clears alarms or faults, and an Indicator Check tests indicators in a more limited or different way, not the full all-lamps test.

Lamp Test is used to verify every indicator on the RCU by lighting all lamps at once. This diagnostic check lets you see if any indicator is burned out or dim, ensuring the status lights are reliable before use. It’s separate from normal operation and doesn’t affect how the RCU runs in service. The other options serve different functions: powering on simply applies power, resetting clears alarms or faults, and an Indicator Check tests indicators in a more limited or different way, not the full all-lamps test.

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