If a thrust reverser ARM annunciator remains illuminated in flight after corrective actions, what should the crew do?

• A. Reset the ARM system and continue with the approach.
• B. Perform the actions in any order.
• C. Abort the approach immediately.
• D. Perform each of the three listed actions in the correct sequence.

Answer: (D)

When a thrust reverser ARM annunciator stays illuminated in flight after you’ve taken corrective actions, you must follow the procedures in the exact order and perform all three steps. The reason this order matters is that each step is tied to a specific part of the system’s state—resetting subsystems, reinitializing logic, and then verifying the condition. Doing them out of sequence or skipping a step can leave a latent fault or a latched condition unresolved, giving a false sense of normalcy or risking an unsafe situation if you resume the approach.

By performing all three actions in the prescribed sequence, you ensure the fault is truly cleared, the relevant subsystems are properly reinitialized, and you can confirm the annunciator state before deciding whether to continue or abort.