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F-22 CTF tests missile noise, vibration

by Christopher Ball
95th Air Base Wing Public Affairs

4/21/2006 - EDWARDS AIR FORCE BASE, Calif. (AFPN) -- The F-22 Combined Test Force here achieved another first when an F-22A Raptor flew with an AIM-120D missile in its weapons bay to test the effect of noise and vibration on the missile.

What was unique about the April 14 flight was that the weapon on board, the latest version of the AIM-120 Advanced Medium Range Air-to-Air Missile, or AMRAAM, is still being developed at Eglin Air Force Base, Fla.

"This is a first for the Raptor, as the weapon hasn't been fielded yet," said Capt. Jason Armstrong, an armament engineer with the 411th Flight Test Squadron here. "In the past, we've integrated existing weapons systems such as the JDAM into the aircraft. We're doing this flight testing to help Eglin develop the weapon."

Micah Besson and Adam Yingling, squadron structural engineers, explained the need for noise and vibration testing.

"In previous tests with the (AIM-120C), measurements determined that vibration levels in certain frequencies were harmful to the missile's electronics," Mr. Besson said.

The difference between the AIM-120D and the earlier C-model is in the navigation system, Mr. Yingling said.

"The cards inside are arranged differently, and we're not sure how vibro-acoustics will transmit," he said. "We needed to test the missile to validate Raytheon's modeling and assumptions."

Raytheon is the contractor responsible for designing and building the AIM-120 series missile.

The test plan includes putting the aircraft through a variety of maneuvers throughout the flight regime of the aircraft, including working with the weapons bay doors open and closed, Mr. Yingling said.

"We're trying to give the missile the worst ride and expose it to the worst possible environment," Mr. Yingling said.

He said the tests will allow Raytheon to gather data, which will be used in future qualification tests. 

(Courtesy of Air Force Materiel Command News Service)

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