Boeing KC-135 Stratotanker

United States Air Force - USAF

On 3 May 2013, at approximately 1448 hours local time (L), a KC-135R, tail number 63-8877, assigned to the 22d Expeditionary Air Refueling Squadron, 376th Air Expeditionary Wing, Transit Center at Manas, Kyrgyz Republic, crashed in the foothills of mountains located 6 miles south of Chaldovar, Kyrgyz Republic. The mishap crew (MC), which consisted of the mishap pilot (MP), mishap co-pilot (MCP), and mishap boom operator (MBO), perished during the accident. The mishap aircraft (MA) exploded inflight, impacted the terrain at three main locations, and burned. The MA was completely destroyed with total loss to government property estimated at $66.3 million. Upon impact, approximately 228 cubic meters of soil were contaminated with jet fuel, and three distinct craters containing a burn pattern were created. The MA’s mission was to refuel coalition aircraft in Afghanistan and then return to the Transit Center at Manas. Immediately after takeoff, the MA experienced an unexpected rapid heading change from the direction of flight known as a crab. During climb, nearly continuous rudder hunting caused the MA’s nose to hunt slowly left and right about one degree in both directions. The MP commented on the lateral control challenges and possible series yaw damper (SYD) malfunction but continued the mission without turning off either the SYD or rudder power. Approximately nine minutes into the flight, the MA began a series of increasing yaw and roll oscillations known as a dutch roll, which was undiagnosed by the MC. The MCP attempted to decrease these oscillations using manual aileron controls, as well as two brief attempts with the autopilot. The manual corrective inputs kept the oscillations from growing. The autopilot use further exacerbated the situation, and the oscillations intensified. After the second autopilot use, the MP assumed control of the MA and used left rudder to start a left turn. A subsequent series of alternating small rudder inputs, caused by the MA’s dutch roll-induced acceleration forces varying the MP’s foot pressure on the rudder pedals, sharply increased the dutch roll oscillations. Within 30 seconds, the MP made a right rudder input to roll out of the turn, exacerbating the dutch roll condition. The cumulative effects of the malfunctioning SYD, coupled with autopilot use and rudder movements during the unrecognized dutch roll, generated dutch roll forces that exceeded the MA’s design structural limits. The tail section failed and separated from the aircraft, causing the MA to pitch down sharply, enter into a high-speed dive, explode inflight and subsequently impact the ground at approximately 1448L. Crew: Cpt Victoria Ann Pinckney, Cpt Mark Tyler Voss, T/Sgt Herman Mackey III.

United States Air Force - USAF

On Sept. 26, at approximately 8:03 p.m. local time, a KC-135R landed at Manas International Airport following a combat mission over Afghanistan. After landing, the KC-135R was parked at the intersection of the active runway and a taxiway while the crew awaited clarification on instructions from the air traffic control tower. The KC-135R was struck by a host nation TU-154 that was taking off. The TU-154's right wing struck the fairing of the KC-135R's No. 1 engine. The force of the impact nearly severed the No. 1 engine from KC-135R and destroyed a portion of the aircraft's left wing. The TU-154 lost approximately six feet of its right wingtip, but was able to get airborne and return to the airport for an emergency landing with no additional damage to the aircraft. The three aircrew members on board the KC-135R, as well as the nine aircrew members and 52 passengers aboard the TU-154, survived the accident. None of the aircrew or passengers on board the TU-154 sustained any injuries. One KC-135 crew member sustained minor abrasions while evacuating the aircraft.

Air National Guard

The aircraft was returning to Geilenkirchen NATO AFB following a refueling mission over Germany on behalf of the 141st Air Refueling Wing in Fairchild, WA. On final approach by night, the crew apparently initiated a go-around procedure when the aircraft pitched up to an angle of 7,5°, stalled and crashed in a wooded area. The aircraft was destroyed and all four occupants were killed.

United States Air Force - USAF

The crew was completing a local training flight at Pope AFB. For unknown reasons, the aircraft landed very hard, causing the nose gear to collapse. The aircraft was stopped on the runway and all 11 occupants escaped uninjured. The aircraft was damaged beyond repair.

United States Air Force - USAF

The crew was completing a local training flight at Pope AFB. Apparently following a wrong approach configuration, the aircraft landed too far down the runway and was unable to stop within the remaining distance. It overran, lost its undercarriage and came to rest, broken in two. All 14 occupants were injured.

United States Air Force - USAF

While parked at Pease AFB and under maintenance, the aircraft suffered several explosions and caught fire. Two mechanics evacuated safely and the aircraft was destroyed by fire. It is believed the aircraft caught fire as it was being prepared for refueling and had a little fuel on board.

United States Air Force - USAF

The crew departed Loring AFB on a training flight. While cruising by night along the US-Canada border, the aircraft suffered an explosion, entered a dive and crashed in an open field located in Carlingford, New Brunswick. The aircraft was destroyed and all four crew members were killed.

United States Air Force - USAF

Following an uneventful refueling mission, the crew returned to Eielson AFB. After landing, the aircraft was parked on the apron and when the crew shut down the engine, an explosion occurred. The aircraft was totally destroyed by fire and two crew members were killed while five others were rescued.

United States Air Force - USAF

Shortly after liftoff from runway 16 at Dyess AFB, while climbing to a height of about 60-100 feet, the aircraft banked right, causing the right wing to struck the ground. Out of control, the aircraft crashed in a huge explosion and was totally destroyed by impact forces and a post crash fire. All 19 occupants were killed, among them army officer and family members including spouses and children.

United States Air Force - USAF

Following a steep approach at Oscoda-Wurtsmith Airport in crosswind conditions, the four engine aircraft landed hard. Upon landing, it went out of control, veered off runway and came to rest, bursting into flames. Six crew members were killed while 10 others were injured. The aircraft was destroyed by a post crash fire.