The landing gear indicator panel red and green lights remain operational as long as which unit is electrically powered?

The landing gear indicator panel red and green lights remain operational as long as which unit is electrically powered?

• A. LGCIU#2
• B. LGCIU#1
• C. LGCIU#3
• D. Battery Power

Answer: (B)

The landing gear indicator panel is fed by the primary Landing Gear Control and Interface Unit. This unit provides the power and drive signals for the red and green lamps that show gear position. There are multiple LGCIUs for redundancy, but the indicator lights rely on LGCIU1 as their power source. As long as LGCIU1 is powered, the red and green indicators stay lit to reflect the gear state; if LGCIU1 loses power, the panel goes dark even if the other LGCIUs have power. Battery power isn’t the normal supply path for these indicators, so their operation hinges on LGCIU1 being powered.

The landing gear indicator panel is fed by the primary Landing Gear Control and Interface Unit. This unit provides the power and drive signals for the red and green lamps that show gear position. There are multiple LGCIUs for redundancy, but the indicator lights rely on LGCIU1 as their power source. As long as LGCIU1 is powered, the red and green indicators stay lit to reflect the gear state; if LGCIU1 loses power, the panel goes dark even if the other LGCIUs have power. Battery power isn’t the normal supply path for these indicators, so their operation hinges on LGCIU1 being powered.