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HAGATNA, Guam - A B-2 stealth bomber plunged to the ground shortly after taking off from an air base in Guam on Saturday, the first time one crashed, but both pilots ejected safely, Air Force officials said.

The aircraft was taking off with three others on their last flight out of Guam after a four-month deployment, part of a continuous U.S. bomber presence in the western Pacific. After the crash, the other three bombers were being kept on Guam, said Maj. Eric Hilliard at Hickham Air Force Base in Hawaii.

At least one B-2 bomber had taken off safely from Andersen Air Force Base but was brought back when another aircraft plunged to the ground.

There were no injuries on the ground or damage to buildings, and no munitions were on board. Each B-2 bomber costs about $1.2 billion to build.

Thick, black smoke could be seen billowing from the wreckage at Andersen, said Jeanne Ward, a resident in the northern village of Yigo who was on the base visiting her husband.

Ward said she didn't witness the crash but noticed a rising plume of smoke behind the base's air control tower.

She said crowds began to gather as emergency vehicles arrived. "Everybody was on their cell phones, and the first thing everyone wanted to know was did the pilots make it out in time," she said.

The Air Force, without identifying the pilots, said one was medically evaluated and released, and the other was in stable condition at Guam Naval Hospital.

A board of officers will investigate what caused the bat-like aircraft to crash at 10:30 a.m., shortly after taking off from a runway. It was the first crash of a B-2 bomber, said Capt. Sheila Johnston, a spokeswoman for Air Combat Command at Langley Air Force Base in Virginia.

All 21 stealth bombers are based at Whiteman Air Force Base in Missouri, but the Air Force has been rotating several of them through Guam since 2004, along with B-1 and B-52 bombers.

The rotations are designed to boost the U.S. security presence in the Asia-Pacific region while other U.S. forces diverted to fight in the Middle East.

The B-2 was first publicly displayed in 1988 and took its first flight a year later. The first bomber was delivered to Whiteman in 1993.

The bombers on Guam were scheduled to return to Missouri now that six B-52s from the 96th Bomb Wing at Barksdale Air Force Base, La., have arrived to replace them.

The distinctive B-2 is described as a "multi-role bomber" that blends stealth technology with a highly efficient aerodynamic design. It is able to deliver large payloads at great range and has been used in combat over Kosovo, Afghanistan and Iraq.

The accident occurred 11 days after a Navy plane crashed into the ocean about 20 miles northeast of Guam's Ritidian Point. Four aircrew members ejected from the EA-6B Prowler electronic warfare aircraft and were rescued by helicopter.

Guam is a U.S. territory 3,700 miles southwest of Hawaii.

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Air Force: Sensor moisture caused 1st B-2 crash



The Air Force on Thursday said the first crash of a B-2 stealth bomber was caused by moisture in sensors and estimated the loss of the aircraft at $1.4 billion.

The crash probably could have been avoided if knowledge of a technique to evaporate the moisture had been disseminated throughout the B-2 program, said Maj. Gen. Floyd L. Carpenter, who headed an accident investigation board.

The "Spirit of Kansas" abruptly pitched up, rolled and yawed to the left Feb. 23 before plunging to the ground at Andersen Air Force Base on the island of Guam. Both pilots ejected safely just after the left wing made contact with the ground in the first crash since the maiden B-2 flights nearly 20 years ago.

"It was just by the grace of God that they were safe, and the good (ejection) system," Carpenter said.

Water distorted preflight readings in three of the plane's 24 sensors, making the aircraft's control computer force the B-2 to pitch up on takeoff, resulting in a stall and subsequent crash.

Carpenter said the pilots and crew followed procedures and "the aircraft actually performed as it was designed. In other words, all the systems were functioning normally."

However, a technique learned by some two years ago that had gone widely unknown and unadopted probably would have prevented the crash, Carpenter said. The technique essentially heats the sensors and evaporates any moisture before data calibrations.

"This technique was never formalized in a technical order change or captured in 'lessons learned' reports. Hence, only some pilots and some maintenance technicians knew of the suggestion," according to Carpenter's executive summary of the accident.

The report said, "The human factor of communicating critical information was a contributing factor to this mishap."

The general said his responsibility was solely for the investigation of the crash and added that the report was forwarded to commanding officers to determine if any disciplinary measures are required.

The sensors measure air pressure to help calculate everything from airspeed to altitude. Because of the bad data, flight computers had inaccurate airspeed and wrongly indicated a downward angle, which contributed to an early rotation and uncontrolled 30-degree pitch up.

Carpenter said the lack of altitude and airspeed prevented the pilots from correcting the aircraft.

Guam, 3,700 miles southwest of Hawaii, is known for its humidity. But the Air Force said water in the sensors never caused any problems.

The Spirit was delivered in February 1995 and expected to be in service for another 50 years.

The bomber had been returning to Whiteman Air Force Base in Missouri, where the 21-plane fleet is based. The Air Force grounded the B-2s and resumed flying them in late April.

Carpenter said procedures and policies are now in place to guard against similar crashes.

"It's fortunate the crew was able to safely eject. It's unfortunate, however, that we lost one of our nation's penetrating bombers," said Gen. Carrol H. Chandler, commander of Pacific Air Forces.