What should be done if the landing gear does not show as down and locked on final approach?

When the landing gear does not indicate that it is down and locked during final approach, the appropriate course of action is to execute a go-around and troubleshoot the issue. This decision is rooted in safety considerations. Landing with gear that is not properly deployed can result in a very dangerous situation, including a potentially catastrophic crash. By opting for a go-around, the pilot has the opportunity to regain altitude and assess the situation without the immediate risk associated with landing.

The troubleshooting process may involve checking the gear indicator system, attempting to retract and re-deploy the gear if time allows, and reviewing the aircraft's operating procedures for manual gear extension. This proactive approach helps ensure that the situation is managed correctly, allowing for a safer resolution.

Continuing the landing without concern could lead to a serious incident or accident, and notifying ATC is important but does not directly address the immediate concern of ensuring the gear is down before landing. Performing a manual gear check might also be part of the troubleshooting, but it should be executed while safely in the go-around phase, ensuring the pilot maintains control of the aircraft and makes informed decisions.