United States of America

Shortly after takeoff from Seattle-Tacoma Airport, while climbing in marginal weather conditions, the twin engine airplane went out of control and crashed in a residential area located in Riverton Heights, near the airport. Two passengers were seriously injured while four other occupants including the pilot were killed.

While cruising at an altitude of 19,000 feet in marginal weather conditions, the pilot lost control of the airplane that crashed in a wooded area located about nine miles northwest of Chester, California. The wreckage was found few hours later. The aircraft was destroyed and all eight occupants were killed.

Just after takeoff from Palma Sola, an engine failed. The pilot lost control of the airplane that collided with a fence. The pilot was uninjured and the aircraft was damaged beyond repair.

Few minutes before its scheduled arrival in Kodiak, the seaplane went out of control and crashed into the Chiniak Bay. SAR operations were conducted but eventually suspended after few days as no trace of the aircraft nor the five occupants was found.

The airplane was completing a cargo flight from San Francisco to Deadhorse with an intermediate stop in Fairbanks, carrying a crew of three and 17,000 liters of fuel. After touchdown on a gravel runway covered by snow and ice, control was lost. The airplane veered off runway to the left, contacted an embankment then came to rest on a road. All three crew members escaped uninjured while the aircraft was partially destroyed by fire.

While approaching Pine Bluff-Grider Field by night, the crew encountered poor visibility due to fog and low clouds. Decision was taken to initiate a go-around. Few minutes later, while on a second approach, the twin engine airplane descended too low, struck trees and crashed in flames in a wooded area located few miles from the airport. The aircraft was destroyed and all four occupants were killed.

During the takeoff roll, the right engine lost power. The pilot lost control of the airplane that veered off runway and collided with a snow bank. All three occupants were injured and the aircraft was damaged beyond repair.

On a night approach to Birmingham Airport, the crew reported trim trouble to ATC and decided to initiate a go-around. While trying to gain altitude, the crew lost control of the airplane that stalled and crashed near the airport. Both pilots were killed while both passengers were seriously injured.

Flight NW6231 departed New York-JFK at 19:14 for a ferry flight to Buffalo and was cleared by departure control to climb to FL140. At 19:21 the flight was cleared to climb to FL310. The aircraft began to climb 2,500 fpm at an airspeed of 305 knots. As the aircraft climbed through FL160, both the airspeed and the rate of climb began to increase. Reaching FL230, the airspeed had reached 405 knots and the rate of climb had exceeded 6,500 fpm. The overspeed warning horn sounded a little later, followed 10 seconds later by a stick shaker stall warning. The aircraft then leveled at 24800 feet with a speed of 420 knots until it turned rapidly to the right, 13 seconds later. The airplane started to descend out of control, reaching a vertical acceleration of +5g until it struck the ground in a slightly nose down and right wing-down attitude. The aircraft had descended from 24000 feet to 1090 feet in 83 seconds.

The takeoff was attempted from a runway contaminated with snow windrows. During takeoff roll, the twin engine airplane was unstable and the pilot decided to lift off prematurely. The aircraft stalled then collided with a snow bank and crashed in flames. All four occupants were injured, two of them seriously.