2008 Andersen Air Force Base B-2 accident

The Andersen Air Force Base B-2 accident was a February 2008 incident when the Spirit of Kansas, a United States Air Force B-2 Spirit stealth heavy bomber, crashed on the runway shortly after takeoff from Andersen Air Force Base in Guam. The incident marks the first operational loss of a B-2 bomber. Both crew members successfully ejected but the aircraft was destroyed. With an estimated loss of US$1.4 billion, this was the most expensive crash in USAF's history.

Description
On 23 February 2008, a B-2 crashed on the runway shortly after takeoff from Andersen Air Force Base in Guam. The crash of the Spirit of Kansas, 89-0127, which had been operated by the 393rd Bomb Squadron, 509th Bomb Wing, Whiteman Air Force Base, Missouri, and which had logged 5,100 flight hours, was the first ever crash of a B2.

The two-officer crew attempted to save the bomber, but as one of its wings began to "hook" the ground, they ejected from the aircraft and survived the crash. The aircraft was destroyed, a total loss estimated at US$1.4 billion.

According to the Air Force Times, which is a private-industry magazine, no munitions were on board. The Air Combat Command accident board report states that "classified material" had been loaded onto the bomber the morning the aircraft was returning to Whiteman Air Force Base "after a four-month deployment in support of [Pacific Air Force's] continuous bomber presence."

At Guam Naval Hospital, one pilot was evaluated and released, and the second remained hospitalized. A B2 already in the air was called back to Andersen following the crash, where it and the other B2s were grounded until an initial investigation into the crash was complete. Six B-52s of the 96th Bomb Squadron, 2d Bomb Wing at Barksdale Air Force Base, Louisiana were deployed to replace the B2s.

The commander of the 509th Bomb Wing, Brig. Gen. Garrett Harencak, followed up on the incident by temporarily suspending flying operations for all 20 remaining B2s to review procedures. Harencak termed the suspension a "safety pause" and stated that the B2s would resume flying if called upon for immediate operations. The B2 fleet returned to flight status on 15 April 2008.

The findings of the investigation stated that the B-2 crashed after "heavy, lashing rains" caused water to enter skin-flush air-data sensors. The data from the sensors are used to calculate numerous factors including airspeed, altitude, and attitude. Because three pressure transducers had been improperly calibrated by the maintenance crew due to condensation inside devices, the flight-control computers calculated inaccurate aircraft angle of attack and airspeed. Incorrect airspeed data on cockpit displays led to the aircraft rotating 12 knots slower than indicated. After the wheels lifted from the runway, which caused the flight control system to switch to different control laws, the erroneously sensed negative angle of attack caused the computers to inject a sudden, 1.6g, uncommanded 30-degree pitch-up maneuver. The combination of slow lift-off speed and the extreme angle of attack (and attendant drag) resulted in an unrecoverable stall, yaw, and descent. Both crew members successfully ejected from the aircraft soon after the left wing tip started to gouge the ground alongside the runway. The aircraft impacted the ground, tumbled, and burned after its fuel ignited.

Recovery
The aircraft was rebuilt and flown back to the United States. After further repair at the contractor facility in Palmdale, the aircraft returned to service at Whitman AFB in December 2013.