What is the significance of 400 feet AGL in the climbout procedure?

The significance of 400 feet AGL (Above Ground Level) in the climbout procedure pertains to safety and operational guidelines. At this altitude, pilots are often required to maintain a minimum safe altitude for turns after takeoff. This ensures that there is sufficient altitude to avoid obstacles in the vicinity of the airport and reduces the risk of terrain or obstacle strikes during a critical phase of flight.

This altitude serves as a benchmark for pilots to make tactical decisions regarding their flight path and maneuvering. By adhering to this standard, pilots enhance safety and operational integrity during the initial climbout phase, providing a buffer that accounts for both equipment performance and environmental factors.

Other referenced altitudes or procedures, such as autopilot engagement or navigation checks, typically occur later in the climb phase or under different procedural guidelines and are not as directly associated with immediate safety concerns upon departure.