Gulf Air 771 was a commercial passenger flight from Karachi, Pakistan to Abu Dhabi, the United Arab Emirates on September 23rd, 1983 carrying 112 people.
Crash:
22 km southwest of Dubai near the town of Jebel Ali a suitcase bomb in the baggage compartment of the plane exploded, shrapnel knocked out several flight control systems, and a fire was started in the baggage compartment, the pilots lost control of the plane and it crashed into the desert killing everyone on board.
Investigation:
A man had checked into Karachi earlier the day and never boarded the plane, his suitcase however was put on and the plane departed Karachi without him. The man is believed to be part of the Abu Nidal organization and the organization was trying to pressure Saudi Arabia into giving money to Abu Nidal to avoid terrorist attacks in Saudi Arabia.
Condor Flugdienst 3782 was a commercial passenger flight from Stuttgart, West Germany to Izmir, Turkey on January 2nd, 1988 carrying 16 people.
Crash:
As the plane neared Izmir it was performing an ILS maneuver, it then turned in the opposite direction of the airport and descended into Dümentepe Hill killing everyone on board.
Investigation:
The ILS on the plane had been switched on after it had already passed the Non-Directional Beacon so it missed the turn, the plane then turned in the opposite direction of the ILS beam. The First Officer was the one flying and was distracted by the Captain Constantly Lambasting and insulting him over the most minor details.
Korean Air Cargo 6316 was a scheduled cargo flight from Shanghai, China to Seoul, South Korea on April 15th, 1999 operated by 3 pilots.
Crash:
The plane departed Shanghai at 4:00 PM, at 4:04 PM the plane entered an uncontrollable dive and crashed into an industrial zone killing all 3 crew members on board and 5 people on the ground.
Investigation:
The plane was supposed to climb to 4,500 feet or 1,500 meters, during the ascent the First Officer told the captain that their assigned altitude was 1,500 feet instead of meters, this led to the Captain pushing forward on his control column putting the plane in a dive.
Air Algeria 5017 was a commercial passenger flight from Ouagadougou, Burkina Faso to Algiers, Algeria on July 24th, 2014 carrying 116 people.
Crash:
When the plane was at its cruising altitude of 31,000 feet it flew into an ice storm, the plane slowly lost speed for over 2 minutes and it eventually stalled, rolled over, and spiraled into the Sahara killing everyone on board.
Investigation:
The pilots were diverted into the ice storm and forgot to turn on the engine anti-ice system, this caused the engine's sensors the clog up with ice and send false readings to the pilots, the false information said the engines were overspeeding so the pilots reduced power to the engines. From the erroneous readings, the autothrottle soon disconnected and the plane lost more speed and at the same time the Autopilot pitched the nose up to maintain altitude and caused the plane to stall, the pilots failed to respond to the stall warnings and stick shaker activating.
Lauda Air 004 was a commercial passenger flight from Hong Kong to Vienna, Austria with a stopover in Bangkok, Thailand on May 26th, 1991 carrying 223 people.
Crash:
At 11:02 PM the plane departed Bangkok bound for Vienna, at 11:17 PM the plane entered a steep dive and broke up over Thailand killing everyone on board. This was the first fatal crash of a 767.
Investigation:
At 11:08 PM both pilots received a warning about Engine No.1 and a possible systems failure, the pilots brushed this off as an advisory thing and continued with the flight. At 11:17 PM the thrust reverser on Engine No.1 activated and put the plane into a dive, the pilots were unsuspecting and were unable to prevent the dive and regain control due to the severity of the situation, it is assumed that, because the plane was climbing to its cruising altitude, there wasn't enough altitude to recover in time. The thrust reversers are controlled by 2 TR valves, it was deduced that under the right circumstances it was possible for both the valves to open from a short circuit and deploy the thrust reverser. The plane's vertical and horizontal stabilizers detached from the plane first before the wings separated and the fuselage began to disintegrate.
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