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Monday, May 9, 2011

Bin Laden Raid Crash Helo Reveals Stealth

Photography of U.S. military technology left behind in the May 1 raid against Osama bin Laden shows that previously unseen stealth-like enhancements to rotorcraft played a critical role in the mission to take down the Al Qaeda leader.
The Aviation Week analysis, made shortly after the Abbottabad, Pakistan, operation, proves that the potential to capture or kill the 9/11 mastermind was important enough to U.S. leaders to risk the lives of at least two dozen of the most highly trained U.S. special operators. In addition, the raid would have been a major international embarrassment for Washington if something went wrong and might have exposed cutting-edge military and intelligence technology.
In the end, only the exposure of technology might have occurred—and even then, the otherwise highly successful operation still has left tantalizingly few, albeit significant, new clues to military advancements.
According to widely published photographs from Abbottabad, at least one previously undisclosed, low-observable helicopter apparently was part of the U.S. task force that killed and recovered bin Laden’s body. It appears to be a significantly modified version of a Sikorsky H-60 Black Hawk, although whether an MH-60K, L or M version is still unknown. The U.S. Army’s 160th Special Operations Aviation Regiment (Airborne), the Night Stalkers, uses all three types of MH-60s.
Pentagon leadership remains tight-lipped about operational details. But an intelligence source says two Black Hawks and two Boeing HH-47 Chinooks were used. The Black Hawks participated in the assault, and the Chinooks were used to refuel the Black Hawks and for backup. Indeed, when the one Black Hawk was downed, a Chinook came in to help complete exfiltration of the Navy Seals.
What is as intriguing as the stealth adaptations is how well they apparently worked. “The attack on bin Laden did not occur in some remote area outside Pakistani control, but in a compound in a city of some 100,000 and less than 100 mi. from a major Pakistani population center like Islamabad, and one occupied by a brigade from the Pakistani army’s second division and the location of the Army’s military academy,” notes analyst Anthony Cordesman of the Center for Strategic & International Studies.
According to the chairman of the House Armed Services Committee, who was briefed last week by the military on the issue, it was not a mechanical failure or a problem by the pilot that downed the Black Hawk—it was a miscalculation of temperature in and outside the compound. The Black Hawk ran into lift trouble due to a 15F difference inside the courtyard, says Rep. Buck McKeon (R-Calif.). “They couldn’t hold the ­hover.”
The Seals appear to have destroyed almost all of the airframe that landed inside the compound, but part of the helicopter’s tail landed outside the wall and escaped demolition during the roughly 40-min. ground operation.
The public photos show that the destroyed Black Hawk’s tail features stealth-configured shapes on the boom and the tail-rotor hub fairings, swept stabilizers and a “dishpan” cover over a five- or six-blade tail rotor. It has a silver-loaded infrared (IR) suppression finish similar to that seen on the Bell-Boeing V-22 Osprey.
Stealth enhancements for rotorcraft are not new and were applied extensively to the Boeing/Sikorsky RAH-66 Comanche, canceled in 2004. Compared with fixed-wing stealth, more emphasis is usually placed on noise and IR signatures.

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