Military

While on approach to Papaly Airport, the captain contacted ATC and requested that the approach lights intensity should be increased. Shortly later, the twin engine aircraft went out of control and crashed in the sea few km short of runway. All 63 occupants were killed.

The aircraft was approaching Palaly AFB in Jaffna following a flight from Colombo, carrying six crew members and supply equipments. On final, the aircraft was shot down by a 20 mm shell and crashed in the sea about 3 km offshore. A crew member was rescued while five other occupants were killed.

The aircraft was completing a flight from Comodoro Rivadavia to Córdoba with an intermediate stop in Villa Reynolds, carrying 48 passengers and five crew members, among them officers from the Air Force flying to Córdoba to take part to the celebration of the 25th anniversary of the Argentinian Air Force Academy. En route from Villa Reynolds to Córdoba, while cruising over a mountainous area, weather conditions deteriorated with clouds, rain falls, turbulences and strong winds. At an altitude of 8,000 feet, the aircraft struck the slope of Mt San Agustin located southeast of Villa Dolores. The wreckage was found the following morning about 300 metres below the summit. The aircraft disintegrated on impact and all 53 occupants were killed, among them 20 children.

After takeoff from Ponta Delgada-Nordela Airport, the aircraft encountered difficulties to gain height. It collided with power lines, stalled and crashed in the sea few dozen metres offshore. All seven crew members were killed.

The aircraft departed Colombo-Ratmalana Airport on a flight to the Palaly AFB (Jaffna), carrying 70 soldiers and five crew members. Few minutes after takeoff, the crew declared an emergency and reported technical problems with the instruments. After being cleared to return, the pilot-in-command initiated a turn at an altitude of 8,000 feet when the aircraft entered an uncontrolled descent and crashed in the sea about 40 km north-northwest of Ratmalana Airport. The aircraft disintegrated on impact and all 75 occupants were killed. It was reported that weather conditions at the time of the accident were poor with thunderstorm activity.

After departure from Boise-Gowen Field, en route to Peterson AFB in Colorado Springs, the crew encountered technical problems with the engine n°2. The crew declared an emergency and elected to divert to Mountain Home AFB. About 20 minutes into the flight, the engine n°2 compressor disintegrated. The aircraft entered an uncontrolled descent and crashed 12 miles north of Bliss. All six crew members were killed.
Crew:
Lt Col Robert Buckout, Commander
1st Lt Lance Daugherty, pilot,
Cpt Geoffery Boyd, navigator,
CMSgt Jimmy Vail, flight engineer,
M/Sgt Jay Kemp, loadmaster,
S/Sgt Michael Scheideman, loadmaster.

The aircraft was completing a flight from Anuradhapura to Jaffna-Palaly Airport on behalf of the Sri Lanka Air Force. On final approach, at an altitude of 3,000 feet, the aircraft was shot down by a surface-to-air missile and crashed in a huge explosion. All 52 occupants were killed, among them 44 soldiers, two policemen, three journalists and three crew members.

After takeoff from Palaly Airport, while climbing, the left engine exploded. The crew declared an emergency and was cleared to return. On short final, the aircraft went out of control and crashed in a huge explosion about 200 metres short of runway. All 45 occupants were killed, among them 40 soldiers and two civilians.

In unknown circumstances, the twin engine aircraft struck the slope of a mountain located near Apolo. All seven occupants were killed.

The C-21A, a USAF designation of the Learjet 35A was assigned to the 332nd Airlift Flight at Randolph AFB, Texas. The aircraft would depart Randolph AFB as flight Kiowa 71 to Wright-Patterson AFB, Andrews AFB and then back to Randolph. The aircraft was landed at Andrews AFB at 10:57. The crew requested a full load of fuel and told Serv-Air maintenance technicians that they had been unable to transfer fuel from the wing tanks to the fuselage tank. A Serv-Air maintenance technician removed the fuel-control panel from the aircraft and replaced the fuselage-tank transfer/fill switch. The maintenance technician told the crew that replacement of the fuselage-tank switch had not corrected the problem and that he was going to try to correct the problem by replacing the fuel-control relay panel. This was a time consuming job. The crew decided to continue back to Randolph without the repairs. The fuselage fuel tank was full and they had not had trouble earlier in the day getting fuel out of the fuselage tank. The aircraft departed from Andrews AFB at 16:38. The aircraft was in cruise flight at FL390 at 17:53 when the crew began to transfer fuel from the fuselage tank to the wing tanks. The crew did not know that the right standby fuel pump was operating and was preventing fuel from being transferred from the fuselage tank to the right wing. Bearings in the right standby pump were in a deteriorated condition and the pump had required higher-than-normal electrical current for rotation. The higher-than-normal electrical current had caused progressive damage to two contacts in the fuel control relay panel and eventually had caused the contacts to bond together. This caused the pump to run continuously throughout the flight and to prevent fuel transfer from the fuselage tank to the right wing. The aircrew noticed that the left wing-tip tank had become 800 pounds [363 kilograms] heavier than the right wing-tip tank during the transfer, and they attempted to analyse the malfunction and correct the imbalance. A fuel-imbalance during-fuel-transfer malfunction however was not included in the Air Force training syllabus, nor was the procedure contained in the C-21A checklist. At 17:56, the copilot told the Atlanta Air Route Traffic Control Center (Atlanta Center) controller, "Sir, we need to revise our flight plan. We’re having a problem getting some fuel out of one of our wings. Can we get vectors to Maxwell Air Force Base? And we’re going to need to dump fuel for about five minutes." The crew at 18:00 began to dump fuel from the left wing-tip tank. However, they still had an imbalance in the wing tanks themselves of about 200 pounds (91 kilograms). At 18:03 the flight was cleared to descend from FL350. The crew then observed that fuel quantity was decreasing rapidly in the right wing tank, that the left wing tank was full and that the left wing-tip tank had begun to fill with fuel. At 18:07, the copilot told the Atlanta Center controller, "Sir, we’d like to declare an emergency at this time for a fuel problem and, ah, get to Maxwell quick as we can." They were cleared direct to Maxwell AFB and cleared to descend to 17,000 feet, and later to 11,000 feet. At 18:15, the copilot told Atlanta Center, "We need to change the airfield, to get to the closest piece of pavement we can land on." The controller said, "Kiowa 71, we got an airport at 12 o’clock and 12 miles. It’s Alexander City." The crew accepted this and began their emergency descent into Alexander City airport. At 18:16 the copilot took over control since the captain did not have the airfield in sight and the copilot did. The aircraft was northeast of the airport at 8,800 feet and was descending at 5,600 feet per minute with the wing-lift spoilers extended when the copilot told Atlanta Center that they were on a left base for the runway. The crew attempted to fly a visual traffic pattern to runway 18 but were in a poor position to complete the approach and landing. They subsequently elected to enter a left downwind leg for runway 36. As airspeed was reduced, aileron authority diminished and, because of the fuel imbalance, the aircraft became difficult to control. The copilot, flying from the right seat, did not have a good view of the runway and asked the aircraft commander for help in positioning the aircraft on downwind and in beginning the turn toward the runway. The captain wanted to get the gear down but the copilot had difficult controlling the plane already: "Don’t put anything down," the copilot said. "Nothing down, nothing down." The aircraft was at 2,030 feet when the gear-warning horn sounded. The captain said, "Gear down. Gear down." The copilot said, "No. Stand by. Stand by." "Gear down," the captain said. "Gear down, man." "No, not yet, not yet," the copilot said. The copilot then asked the aircraft commander to "push the power up a little bit for me." Power was increased and the gear was extended. The aircraft was at about 1,500 feet and was one mile southwest of the runway at 18:19 when the copilot began a left turn. Approximately halfway through the final turn and one mile due south of runway 36, the aircraft abruptly rolled out, flew through the extended runway centerline and continued in an east, northeasterly direction approximately 800 feet above the ground. The copilot had rolled out of the turn to regain lateral control of the aircraft. At this time the right engine was operating at a reduced thrust setting in an attempt to counteract the effects of the fuel imbalance. The captain, to center the ball in the slip indicator, applied pressure on the left rudder, against pressure that was being applied on the right rudder by the copilot. The captain said, "Step on the rudder. Step on the rudder." The copilot said, "Paul, no. Paul, don’t." The application of left rudder caused the aircraft to roll left rapidly. It rolled inverted entered the trees and struck the ground.