What is the primary function of the ejection seat catapult cartridge?

The primary function of the ejection seat catapult cartridge is to push the seat up the catapult rails. When an ejection sequence is initiated, the catapult cartridge fires, providing the necessary force to propel the ejection seat upwards along the rails of the ejection system. This action is crucial for successfully ejecting the pilot from the aircraft, as it ensures that the seat clears the aircraft in a safe and timely manner, allowing for subsequent deployment of the parachute.

While the catapult does not ignite the rocket motor, serve as fuel for the rocket motor, or directly release the canopy, these functions may be associated with other components within the ejection system. For instance, the canopy is released by other mechanisms, allowing the seat to eject properly. Thus, the ejection seat catapult cartridge specifically is designed for the propulsion of the seat upwards, making this function essential for the overall ejection process.