Stock Price: 133.57 +0.04 5/18/2018 3:59 PM ET

Stock Price: 133.57 +0.04 5/18/2018 3:59 PM ET

Attitude Control Motor (ACM) for Orion Exploration Vehicle

​Orbital ATK is providing the attitude control motor for NASA’s Orion Crew Exploration Vehicle, which is being developed by Lockheed Martin. The motor has two critical functions. It first steers Orion’s launch-abort system and crew module away from the launch vehicle in the event of an emergency. Once cleared from hazards, the ACM then orients the capsule for parachute deployment.

The ACM consists of a solid-propellant gas generator, with eight proportional valves equally spaced around the circumference of the three-foot-diameter motor. In combination, the valves can exert up to 7,000 pounds of steering force to the vehicle in any direction upon command from the crew module. The valves are controlled by a redundant power and control system.

Orbital ATK achieved multiple industry milestones with the ACM, including: the first system-level demonstration of a controllable solid propulsion system intended for human spaceflight; the first system-level demonstration of high-thrust proportional valves; the first use of a high-voltage lithium-ion battery in a solid-propellant control system; and the first use of 4D C-C/SiC in a full-up system demonstration.

Features Technical Data
Motor Weight: 1650 lb
Length: 62 in.
Diameter: 32 in.
Case Material: D6AC Steel
Internal Case Insulation Material: Aramid filled ethylene propylene diene monomer (EPDM) Material
Propellant: Carboxyl-terminated polybutadiene
More Information
Orion Launch Abort System Attitude Control Motor Fact Sheet