At what altitude does the manual override handle become necessary for initiating seat/pilot separation?

The manual override handle becomes necessary for initiating seat/pilot separation above 14,000 feet MSL due to the operation of the ejection seat system. At altitudes lower than this, such as below 14,000 feet, the automatic systems are designed to function effectively and typically control the ejection process without requiring manual intervention.

As altitude increases, the dynamics of the ejection process become more critical, and at altitudes above 14,000 feet, the manual override handle allows the pilot to ensure a successful separation from the aircraft, compensating for potential issues like the need for conscious control of ejection due to faster aerodynamic forces at higher altitudes. This functionality is important for pilot safety and effectiveness during emergency situations, ensuring that the pilot can maintain control over the ejection process when necessary.