- BOAC Flight 911
Infobox Airliner accident
name=BOAC Flight 911
BOAC Boeing 707at London Heathrowin 1964
March 5, 1966
Mount Fuji, Japan
Tokyo International Airport
Kai Tak Airport
Aircraft Type=Boeing 707-436
BOAC Flight 911 (Speedbird 911) was a round-the-world flight operated by
British Overseas Airways Corporation. The Boeing 707operating as flight 911 on March 5, 1966, was commanded by Captain Bernard Dobson, 45, from Dorset, an experienced 707 pilot who had been flying these aircraft since November 1960.
The aircraft disintegrated and crashed near
Mount Fuji, Japanshortly after departure from Tokyo International Airport, at the start of the Tokyo- Hong Kongsegment. All 113 passengers and 11 crew members were killed in the disaster, including a group of 75 Americans associated with Thermo King Corporationof Minneapolis, Minnesota, on a 14-day company sponsored tour of Japan and Southeast Asia. There were 26 couples traveling together in the group, leaving a total of 63 children orphaned.
Accident investigation results
The accident aircraft arrived in Tokyo at 12:40 hours on the day of the accident from
Fukuoka Airportwhere it had diverted the previous day due to conditions on the ground in Tokyo. The weather there had since improved behind a cold frontwith a steep pressure gradientbringing cool dry air from the Asian mainland on a strong west-northwest flow, with crystal clear sky conditions. During their time on the ground, the crew received a weather briefing from a company representative, and filed an instrument flight rules(IFR) flight plancalling for a southbound departure via the island of Izu Ōshima, then on airway JG6 to Hong Kong at flight level310 (31,000 feet).
At 13:42 hours the crew contacted
air traffic controlrequesting permission to start engines, and amending their clearance request for a visual meteorological conditions(VMC) climb westbound via the Fuji-Rebel-Kushimoto waypoints, which would take them nearer to Mount Fuji, possibly to give the passengers a better view of the landmark. The aircraft began taxiingat 13:50 and took-off into the northwest wind at 13:58. After takeoff, the aircraft made a continuous climbing right turn over Tokyo Bay, and rolled out on a southwest heading, passing north of Odawara. It then turned right again toward the mountain, flying over Gotenba on a heading of approximately 298°, at an indicated airspeedof 320 to 370 knots, and an altitude of approximately 4,900 m (16,000 ft), well above the 3,776 m (12,388 ft) mountain peak.
While flying into the wind, approaching Mount Fuji from the downwind side, the aircraft encountered severe
clear-air turbulenceassociated with lee waves, causing a sudden structural failurethat initiated the in-flight breakup sequence. At the time of the accident, winds at the summit of Mount Fuji were measured at 60 to 70 knots from the northwest. Lenticular clouds associated with lee waves were observed on weather satellite photos taken 30 minutes before the accident some 240 km (150 mi) to the south, but were not visible in the vicinity of the accident where the skies were clear.
A U.S. Navy
A-4 Skyhawkthat was sent up shortly after the accident to search for the wreckage encountered extreme turbulence in the accident area. The cockpit accelerometer display registered peak accelerationvalues of +9 and -4 g-units, causing temporary loss of control, and leading the Navy pilot to believe his aircraft would also break-up in the turbulence. The pilot regained control and landed safely, but the aircraft was grounded for post-flight inspection by maintenance personnel. Many other aircraft that passed near Mount Fuji that day also reported moderate to severe turbulence.
The accident was photographed by
Japan Self-Defense Forcespersonnel at the nearby Fuji Training Base, and 8 mm filmshot by one of the passengers during the flight also survived the crash. Witnesses on the ground reported seeing the aircraft in a flat spin trailing white "smoke" prior to breaking up in flight. The white cloud was later determined to be atomized jet fuel escaping from the fuel tanks due to the breakup. The film shot on board was developed by investigators, and showed evidence that the aircraft experienced severe turbulence just prior to the accident. No evidence was recovered from the flight data recorder, which was destroyed by fire with the rest of the nose section which fell separately. The aircraft did not have a cockpit voice recorder, and no distress call was received from the flight.
The aircraft left a debris field 16 km (10 mi) long. Analysis of the location of wreckage allowed the accident investigators to determine that the
vertical stabilizerattachment to the fuselage failed first. It left paint marks indicating that it broke off the port side horizontal stabilizeras it departed to the left and down. A short time later, the ventral fin and all four engine pylons failed due to a leftward over-stress, shortly followed by the remainder of the empennage. The aircraft then entered a flat spin, with the forward fuselage section and the outer starboard wing breaking off shortly before impact with the ground.
Although some stress cracking was found in the vertical stabilizer bolt holes, it was determined by subsequent testing that it did not contribute to this accident. Still, it was potentially a significant safety-of-flight issue. Subsequent inspections on Boeing 707 and similar
Boeing 720aircraft as a result of this discovery did reveal this was a common problem, and corrective maintenance actions on the fleet eventually followed.
The probable cause determination was: "The aircraft suddenly encountered abnormally severe turbulence over Gotemba City which imposed a gust load considerably in excess of the design limit."
This accident was one of five fatal aircraft disasters -- four commercial and one military -- in
Japanin 1966, occurring less than 24 hours after Canadian Pacific Airlines Flight 402crashed and burned upon landing at Tokyo International Airport. Flight 911 had taxied past the still smouldering wreckage of that Douglas DC-8a short time before this accident.
Several booked passengers decided to cancel their tickets at the last moment in order to see a
ninjademonstration. These passengers, Cubby Broccoli, Harry Saltzman, Ken Adam, Lewis Gilbertand Freddie Young, were in Japan scouting locations for the fifth James Bondfilm, "You Only Live Twice". [ [http://www.slate.com/id/2168936/ Slate Magazine: The State of the Ninja - By Grady Hendrix] ] ['Inside You Only Live Twice: An Original Documentary,' 2000, MGM Home Entertainment Inc.]
*cite book | last = Job | first = Macarthur | title = Air Disaster | publisher = Aerospace Publications | location = Weston Creek | year = 1995 | isbn = 1875671110 |chapter=When the sky is blue, Fuji is angry |pages=pp. 44-52
* [http://aviation-safety.net/database/record.php?id=19660305-1 Aviation Safety Network] BOAC 911 accident summary
* [http://www.airdisaster.com/photos/boac911/photo.shtml AirDisaster.Com: Accident Photos: BOAC 911]
title=The Worst Single Day
quote=Ironically, the doomed 707 had just taxied out for its takeoff past the wreckage of Canadian Pacific's Hong Kong-to-Tokyo flight.
quote=Examining the wreckage of the BOAC airliner that crashed near Mount Fuji in March, U.S. and Japanese experts detected hairline cracks in the Boeing 707's shorn-off tail assembly.
* [http://www.pilotfriend.com/disasters/crash/boac911.htm BOAC 911] - pilotfriend.com
] Newspaper archive BOAC 911 news reader.
British Broadcasting Company
work=BBC News archive
title=On this day, 5 March 1966: Passenger jet crashes into Mount Fuji
quote=Captain Bernard Dobson, 45, from Poole in Dorset, was in command of the airliner. He has been described as a very experienced 707 pilot and had been flying these aircraft since November 1960.
United Press International
work=Pacific Stars And Stripes
title=Fuji Jetliner Crash Left 63 Orphans in US
quote=At least 63 American children learned Saturday, or will learn someday, that their parents died in a plane crash halfway around the world.
*Inside You Only Live Twice: An Original Documentary' 2000, MGM Home Entertainment Inc. (television programme)
* [http://www.airliners.net/search/photo.search?regsearch=G-APFE&distinct_entry=true Airliners.Net - Picture of the aircraft that carried BOAC Flight 911]
* [http://www.pilotfriend.com/disasters/crash/boac911.htm Pilotfriend.Com - Article about BOAC Flight 911]
* [http://www.planecrashinfo.com/1966/1966-14.htm PlaneCrashInfo.Com - BOAC Flight 911 entry]
* [http://www.airdisaster.com/photos/boac911/photo.shtml AirDisaster.Com - BOAC Flight 911 crash photos]
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