Which color light on the Flight Deck Access Panel indicates the unlocking sequence?

• A. White
• B. Green
• C. Red
• D. Amber

Answer: (A)

Status indication on the Flight Deck Access Panel uses color cues to show where the entry process stands. The white light specifically signals that the unlocking sequence is in progress. This tells the crew that the system is actively working to unlock the flight deck door, not yet completed. Once the sequence finishes, the indicator will typically change to green to confirm the door is unlocked. Red usually signals a fault or access denial, and amber often indicates a caution or hold state. So white is the color that denotes the unlocking sequence.