Scheduled Revenue Flight

After departure from Maracaibo-La Chinita Airport, the crew followed a wrong heading to Santa Bárbara de Zulia (153° instead of 193°), which caused the aircraft to fly to the southeast over the lake of Maracaibo. While cruising at an altitude of 16,500 feet, the crew was cleared by ATC to descend to 5,500 feet. The crew reported to ATC that the VOR seemed to be inoperative but this was denied by the air traffic controller. At an altitude of 9,900 feet, the captain realized something was wrong about the heading selection, stopped the descent and initiated a right turn to gain height when the GPWS alarm sounded. Shortly later, the aircraft struck the slope of Mt La Aguada (3,320 meters high) located about 27 km northeast of Valera, some 170 km northeast of Santa Bárbara de Zulia. The aircraft disintegrated on impact and all 45 occupants were killed.

On March 3, 1991, a United Airlines Boeing 737, registration number N999UA, operating as flight 585, was on a scheduled passenger flight from Denver, Colorado, to Colorado Springs, Colorado. Visual meteorological conditions prevailed at the time, and the flight was on an instrument flight rules flight plan. Numerous witnesses reported that shortly after completing its turn onto the final approach course to runway 35 at Colorado Springs Municipal Airport, about 0944 mountain standard time, the airplane rolled steadily to the right and pitched nose down until it reached a nearly vertical attitude before hitting the ground in an area known as Widefield Park. The airplane was destroyed, and the 2 flight crewmembers, 3 flight attendants, and 20 passengers aboard were fatally injured.

During the takeoff roll on a snow covered runway, the crew lost control of the airplane that veered off runway and came to rest in a ravine. All 17 occupants escaped uninjured while the aircraft was damaged beyond repair.

The crew attempted an emergency landing near Iquitos following an engine failure. The aircraft crash landed and was damaged beyond repair while all 15 occupants were injured.

En route from Macas to Taisha on behalf of the Mission Aviation Fellowship (MAF), the crew encountered poor weather conditions and limited visibility. The aircraft struck the slope of Mt Paso Macuna (1,500 meters high) located about 34 km west of Taisha. The wreckage was found 35 meters below the summit and all 22 occupants were killed.

Crashed on approach to Monrovia-Roberts Airport for unknown reasons. All 72 occupants were rescued and the aircraft was damaged beyond repair.

SKW5569, N683AV, had been cleared to runway 24L, at intersection 45, to position and hold. The local controller, because of her preoccupation with another airplane, forgot she had placed SKW5569 on the runway and subsequently cleared US1493, N388US, for landing. After the collision, the two airplanes slid off the runway into an unoccupied fire station. The tower operating procedures did not require flight progress strips to be processed through the local ground control position. Because this strip was not present, the local controller misidentified an airplane and issued a landing clearance. The technical appraisal program for air traffic controllers is not being fully utilized because of a lack of understanding by supervisors and the unavailability of appraisal histories.

SKW5569, N683AV, had been cleared to runway 24L, at intersection 45, to position and hold. The local controller, because of her preoccupation with another airplane, forgot she had placed SKW5569 on the runway and subsequently cleared US1493, N388US, for landing. After the collision, the two airplanes slid off the runway into an unoccupied fire station. The tower operating procedures did not require flight progress strips to be processed through the local ground control position. Because this strip was not present, the local controller misidentified an airplane and issued a landing clearance. The technical appraisal program for air traffic controllers is not being fully utilized because of a lack of understanding by supervisors and the unavailability of appraisal histories.

Aircraft was dispatched with inoperative airframe deice system, tho an operational deice system was required for flight in known icing conditions. During descent to land, aircraft encountered light icing conditions. Capt believed aircraft could 'handle it' and continued descent. As he began ILS final approach, he noted significant increase of ice accumulation and used higher than normal approach speed. As full (50°) flaps were set, aircraft began buffet and pitched nose down. Capt corrected with full back pressure on control column, but aircraft landed hard, gear collapsed and aircraft slid about 3,600 feet to a stop. No preimpact mechanical anomaly was found, except for inoperative deice system. Investigation revealed pilots had received printout of weather from company computer system with surface observation and terminal forecast, but no area forecast (FA). Pilots and ground personnel were not aware that FA was available at company weather terminal. FA forecasted light and occasional moderate rime and mixed icing in clouds and precipitation above freezing level. Weather deteriorated, but pilots did not require inflight weather info or pireps. Flight mnl noted tailplane ice may cause nose down trim change with flap extension. There was evidence of tail plane stall, lack of company training in cold weather operations, deficiencies in use of deicing systems, and lack of FAA surveillance.

The approach to Gorontalo-Jalaluddin Airport was initiated in thunderstorm activity with heavy rain falls. Too low, the airplane struck the slope of a mountain (1,500 meters high) located about 59 km from the airport. The wreckage was found about 30 meters below the summit. A passenger aged 80 died while all other occupants were rescued.