Next Episode of Air Crash Investigation is
Season 16 / Episode 7 and airs on 23 January 2017 08:30
Flying is one of the safest forms of transport. But what happens when tragedy strikes? From human error and accidents to mechanical faults and design flaws, the success of aviation history is punctuated with disaster and catastrophe. It's rare, but it does happen. Follow experts as they determine what went wrong and work out how to prevent these horrific tragedies from happening again. Examine the wrecks and official records, and hear from eyewitnesses, passengers and aviation experts as we reconstruct some of the most tragic disasters in aviation history. Air Crash Investigation looks at what went wrong and how future disasters can be averted.
United Airlines Flight 811, a Boeing 747-122 (registration number N4713U), took off from Honolulu International Airport bound for Sydney, Australia, via Auckland, New Zealand with 3 flight crew, 15 flight attendants, and 337 passengers aboard.
As the 747 climbed to between 22,000 and 23,000 feet the R5 cargo door tore open, decompressing the cabin and leaving a gaping hole. Five rows of business class seats were blown out of the aircraft, along with nine passengers. Severely injured, a flight attendant was lying down beside the hole caused by the decompression.
Because the cabin was no longer pressurized, the pilots initiated an emergency descent to reach an altitude with breathable air. The explosion had knocked out the number three engine and the number four engine caught fire. Despite only partial flaps (a portion of the shed fuselage damaged the flaps on one wing) and concerns over the plane's landing gear and structural integrity, the crew made a perfect landing and deployed all ten evacuation slides on the aircraft. The evacuation was completed in 90 seconds, with no additional injuries occurring.
Flight: United Airlines Flight 811
AKA: Ripped From the Sky
American Airlines Flight 1420 was a flight from Dallas/Fort Worth International Airport to Little Rock National Airport. On June 1, 1999, a McDonnell Douglas MD-82 (registration number N215AA) overran the runway upon landing in Little Rock and crashed.
According to the NTSB's report, the crew of Flight 1420 learned that the winds were changing direction and that a windshear alert had sounded on the airport due to a thunderstorm nearby. The crew was originally told to expect Runway 22L for landing but requested a change to Runway 4R.
As the aircraft approached Runway 4R, a severe thunderstorm arrived over the airport. The controller's last report to the crew prior to landing stated that the winds were 330 degrees at 28 knots. During the rushed approach, the pilots had failed to arm the spoilers, devices atop the wings that reduce lift by "spoiling" airflow. After landing, the first officer stated, "We're down. We're sliding." The aircraft never fully settled onto its landing gear and therefore braking was ineffective. Despite the application of brakes and reverse thrust, the aircraft skidded off the far end of the runway at high speed and crashed into an approach lighting tier, ending up on the banks of the Arkansas River. Such structures are usually frangible - i.e. designed to shear off on impact - but because the approach lights were located on the unstable river bank, they were firmly anchored and the impact destroyed the aircraft. It broke into three pieces and ignited.
The pilot, one of six crew members, died in the crash, along with 10 of the 139 passengers.
Flight: American Airlines Flight 1420
AKA: Fatal Landing
Swissair Flight 111 (SR-111, SWR-111) was a Swissair McDonnell Douglas MD-11 on a scheduled airline flight from John F. Kennedy International Airport in New York City, United States to Cointrin International Airport in Geneva, Switzerland. This flight was also a codeshare flight with Delta Air Lines.
On September 2, 1998 the aircraft used for the flight, registered HB-IWF, crashed into the Atlantic Ocean southwest of Halifax International Airport at the entrance to St. Margarets Bay, Nova Scotia. The crash site was 8 km from shore, roughly equidistant between the tiny fishing and tourist communities of Peggys Cove and Bayswater. All 229 people on board were killed.
The resulting investigation by the Transportation Safety Board of Canada (TSB) took over four years and cost US$39 million (CAD$57 million). Their main conclusion was that flammable material used in the aircraft's structure allowed a fire to spread beyond the control of the crew, resulting in the loss of control and crash of the aircraft
Flight: Swissair Flight 111
AKA: Fire in the Sky
Alaska Airlines Flight 261 was a flight route operated by Alaska Airlines that provided service between Puerto Vallarta, Mexico, San Francisco International Airport, and Seattle-Tacoma International Airport. On January 31, 2000, the flight crashed into the Pacific Ocean off the coast of Los Angeles, killing all on board.
During the initial climb, the crew realized that there were problems with control of the aircraft. They determined that the horizontal stabilizer had jammed. Thus, the aircrew could not trim the aircraft, which involves making fine adjustments to the positions of the flight control surfaces to keep the plane stable in flight. This left the aircraft flyable, but difficult to keep level. In an effort to correct the problem, the pilots attempted to overcome the jam with the primary and alternate trim systems. At first, their efforts had no effect. After discussions with airline mechanics and dispatchers on the ground, the crew decided to divert the flight to Los Angeles International Airport (LAX).
Meanwhile, the crew continued to troubleshoot the problem. Seven minutes after the decision to divert, the crew was successful in moving the stabilizer. However, the stabilizer moved all the way to a full leading edge up position. This unexpected movement had the effect of causing the aircraft to pitch down suddenly, entering a dive.
Only by exerting large forces on the control columns were the pilots able to regain some control of the airplane and continue flying toward LAX. After consulting with a mechanic on the ground, the pilots debated attempting to adjust the stabilizer trim again. They finally decided to leave the stabilizer as it was. Less than a minute after that decision, about ten minutes after the first dive, an "extremely loud noise" was recorded on the cockpit voice recorder and the aircraft entered a second and final dive. The plane inverted and impacted the Pacific Ocean at high speed. All 83 passengers and five crew members died on impact.
The flight crashed about twenty miles (thirty-two kilometers) northwest of Los Angeles International Airport into the water off Point Mugu, California. The last radio contact with the aircraft occurred while the plane was passing 17,000 feet at a low speed of 119 knots.
Flight: Alaska Airlines Flight 261
AKA: Fatal Error
AeroPeru Flight 603 was a scheduled flight from Jorge Chávez International Airport in Lima(LIM), to Comodoro Arturo Merino Benítez International Airport in Santiago, which crashed on October 2, 1996. The flight originated in Miami, Florida.
On October 2, 1996, just past midnight, the Boeing 757 airliner crew, shortly after takeoff, reported receiving contradictory emergency messages, such as rudder ratio, overspeed, underspeed and flying too low, from the onboard computer; asked for an emergency to be declared and decided to return to base. Faced with the contradictory warnings, the pilot decided to descend. It was only when one wing touched water, almost an hour after emergency declaration, that the pilots realized how confused and disoriented they were. All nine crew members and sixty-one passengers died.
Flight: AeroPeru Flight 603
Air Transat Flight 236 was an Air Transat route between Toronto and Lisbon flown by Captain Robert Piché and First Officer Dirk Dejager. On August 24, 2001, the flight ran out of fuel over the Atlantic Ocean with 306 people (293 passengers + 13 crew) aboard. The flight crew was able to successfully land the plane in the Azores with no loss of life.
Flight: Air Transat Flight 236
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