Airborne Laser returns for more testing

,

EDWARDS AIR FORCE BASE: The YAL-1A, a modified Boeing 747-400F known as the Airborne Laser, is undergoing a long-term test phase at the Air Force Flight Test Center here that includes test firing the aircraft's low-power lasers in flight for the first time.

The Missile Defense Agency is testing and developing the Airborne Laser as part of the boost phase defense segment of the Ballistic Missile Defense System.

The ABL, designed to identify, track and intercept enemy ballistic missiles shortly after missile launch, would operate at altitudes above the clouds to locate and track missiles in their boost flight phase, and then accurately point and fire the high-energy laser to intercept enemy missiles near their launch areas, MDA officials said.

In the current test phase, which is happening throughout the next several months, the ABL will fire its two solid-state illuminator lasers at the NC-135E “Big Crow” test aircraft to verify the ABL's ability to track an airborne target and measure atmospheric turbulence.

The Airborne Laser will aim the illuminators at an instrumented target board located on a missile-shaped image painted on the Big Crow, said Bob Suszek, ABL project manager here.

“We have completed extensive modifications to the ABL aircraft, the system integration lab (here) and the Big Crow target simulator aircraft,” Mr. Suszek said. “We're preparing to fly the ABL against some dynamic target engagements that gets us much closer to missile shoot down.”

Current tests follow modifications made at Boeing's facilities in 2006 in Wichita, Kan. The modifications on the aircraft include the installation of the beam control and fire control solid-state illuminators, as well as the addition of floor reinforcements and chemical-fuel tanks. These modifications were necessary for the integration, to be made later this year, of the Chemical Oxygen Iodine Laser, or COIL — a missile-killing, high-energy chemical laser.

The COIL is composed of six interconnected modules, each as large as a sport-utility vehicle turned on end. Each module weighs about 6,500 pounds and has 3,600 separate parts. When fired through a window in the aircraft's nose turret, it produces enough energy in a 5-second burst to power a typical household for more than one hour.

Using the system integration lab, the COIL was fired more than 70 times since November 2004, beginning with a burst of a fraction of a second. Each test-firing increased until a firing Dec. 6, 2005, when the COIL exceeded the full duration goal at a level believed to be capable of destroying a ballistic missile during the missile's boost phase, or within the first few minutes after it is launched.