How many indicators are on the A220 door?

How many indicators are on the A220 door?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (B)

The important idea here is that door status is clearly and reliably communicated to the crew with indicators. On the A220 door there are two indicators because you want two separate, quick checks to confirm the door is ready for use and the evacuation system is in the correct state. One indicator shows the door’s position/latched state, confirming the door is fully closed and secured. The other indicator shows the evacuation slide’s arming status, confirming whether the slide is armed or disarmed as required for the situation. Having two indicators gives redundancy and cross-checking—if one indicator isn’t readable or appears ambiguous, the second indicator provides the necessary confirmation. This reduces the chance of misinterpreting the door readiness during critical operations like preflight, boarding, or emergency procedures. So, two indicators are standard to ensure clear, redundant visibility of both the door position and the slide arming status.

The important idea here is that door status is clearly and reliably communicated to the crew with indicators. On the A220 door there are two indicators because you want two separate, quick checks to confirm the door is ready for use and the evacuation system is in the correct state.

One indicator shows the door’s position/latched state, confirming the door is fully closed and secured. The other indicator shows the evacuation slide’s arming status, confirming whether the slide is armed or disarmed as required for the situation. Having two indicators gives redundancy and cross-checking—if one indicator isn’t readable or appears ambiguous, the second indicator provides the necessary confirmation. This reduces the chance of misinterpreting the door readiness during critical operations like preflight, boarding, or emergency procedures.

So, two indicators are standard to ensure clear, redundant visibility of both the door position and the slide arming status.