United Airlines Flight 811

aviation accident

United Airlines Flight 811 was a regularly scheduled flight from Los Angeles, United States to Sydney, Australia, with stops at Honolulu, Hawaii and Auckland, New Zealand. On February 24, 1989, the Boeing 747-122 (registered N4713U) operating the route suffered a failure in a cargo door, resulting in an explosive decompression. The incident results in nine passengers dying.

United Airlines Flight 811
Flt 811 damage.JPG
N4713U after the cargo door tore off in flight, causing an explosive decompression and ejecting nine people from the plane
Accident
DateFebruary 24, 1989 (1989-02-24)
SummaryCargo door failure due to design flaw leading to explosive decompression[1]
SitePacific Ocean
near Honolulu, Hawaii
20°41′24″N 158°40′30″W / 20.690°N 158.675°W / 20.690; -158.675Coordinates: 20°41′24″N 158°40′30″W / 20.690°N 158.675°W / 20.690; -158.675
Aircraft
Aircraft typeBoeing 747-122
OperatorUnited Airlines
IATA flight No.UA811
ICAO flight No.UAL811
Call signUNITED 811
RegistrationN4713U (re-registered N4724U after repairs)
Flight originLos Angeles International Airport, Los Angeles, California, U.S.
1st stopoverHonolulu International Airport
Honolulu, Hawaii, U.S.
2nd stopoverAuckland Airport
Auckland, New Zealand
DestinationSydney Airport
Sydney, Australia
Occupants355
Passengers337
Crew18
Fatalities9
Injuries38
Survivors346

AircraftEdit

 
The same aircraft in service with Air Dabia in 1999 at Miami Airport, 10 years after the incident

The incident aircraft, N4713U, was a Boeing 747 which flew for United Airlines. [2] The aircraft was given to United Airlines in November 1970.[3]

FlightEdit

Before the incident, the aircraft flew the first part of the flight. It flew from Los Angeles, United States to Honolulu, United States.[2]

Flight 811 took off from Honolulu at 01:52 local time, with 337 passengers on board.[1]:1–2

Seventeen minutes after departure, as the aircraft was flying through 22,000 to 23,000 feet (6,700 to 7,000 m), the flight crew heard a loud thump.[1]:2 About a second and a half after the thump, a cargo door opened and opened the fuselage. The resulting pressures caused 10 seats to fly off the aircraft.[1]:8[4] All eight passengers in those seats were killed, and another in a seat close to incident area.[1]:109[4]

The pilots first thought a bomb had exploded inside the aircraft. The incident happened two months after Pan Am Flight 103 was blown up over Scotland. They began to fly down in an emergency descent. The aircraft also turned towards Honolulu.[1]:2

Debris from the aircraft during the explosive decompression damaged engines number 3 and 4.[1]:4–8 Engine number 3 was vibrating fast, so the pilots turned the engine off. Engine number 4 failed and was producing flames, so the pilots also turned that engine off.[1]:2

As the aircraft was beginning to land, the pilots moved the flaps and landing gear out. However, the flaps could only be moved out a certain distance because of damaged caused by debris.[1]:3 The aircraft landed and stopped on the runway.[4] All passengers and crew exited the aircraft in less than 45 seconds.[1]:108–109

No victims of the incident were found.[1]:4 Pieces of clothing and body parts were found in the number 3 engine, which means that at least one victim went into the engine.[5]

ReferencesEdit

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Aircraft Accident Report, Explosive Decompression—Loss of Cargo Door in Flight, United Airlines Flight 811, Boeing 747-122, N4713U, Honolulu, Hawaii, February 24, 1989" (PDF). National Transportation Safety Board. March 18, 1992. Retrieved January 14, 2016.
  2. 2.0 2.1 Ranter, Harro (February 24, 1989). "ASN Aircraft accident Boeing 747-122 N4713U Hawaii". Aviation Safety Network >. Retrieved August 16, 2017.
  3. "Air Dabia C5-FBS (Boeing 747 – MSN 19875) (Ex N4713U N4724U ) | Airfleets aviation". www.airfleets.net. Retrieved January 14, 2019.
  4. 4.0 4.1 4.2 "Unlocking Disaster". Mayday. Discovery Channel Canada / National Geographic Channel. No. 1, season 1.
  5. "Nine Sucked Out of Jet 27 Others Hurt As Side of Jumbo Craft Rips Open". The Washington Post. February 25, 1989. Retrieved March 3, 2018.