At what altitude does the parachute canopy deploy during the automatic sequence at medium altitude?

The deployment of the parachute canopy during the automatic sequence at medium altitude occurs when the G-load on the seat drops below 3.4 Gs, specifically between 14,000 to 16,000 feet Mean Sea Level (MSL). This process is designed to ensure that the parachute deploys under conditions where the aircrew is likely to experience less dynamic force, allowing for safer egress from the aircraft. The specific altitude range is critical because it provides adequate time for the parachute to fully inflate before the aircrew reaches the ground, ensuring a safer landing.

The conditions for deployment are intricately tied to both altitude and G-load, as these factors affect the aircraft's dynamics and the ability of the crew members to safely leave the aircraft. Options suggesting deployment below 10,000 feet MSL or specific altitudes like 12,000 or 15,000 feet do not consider the necessary conditions for effective parachute deployment related to G-load, which is a vital aspect of the automatic sequence.