Final answer:
Mode 1 of the ACES II ejection seat is activated when the pilot initiates ejection. It involves firing a rocket motor and deploying a parachute.
Step-by-step explanation:
Mode 1 of the ACES II ejection seat is a mode that is activated when the pilot initiates ejection. In this mode, the ejection seat fires a rocket motor, propelling the pilot and seat out of the aircraft.
The parachute is also automatically deployed to slow the descent.