- Pan Am Flight 125
Pan Am Flight 125 was a scheduled flight from
LondonHeathrow Airport to New York's John F. Kennedy International Airport. It suffered a cargo door failure that pointed to a fundamental design flaw in the early model Boeing 747's, a failure mode that was repeated with fatal consequences on United Airlines Flight 811.
10 March, 1987, a Pan American World AirwaysBoeing 747-121 (registration number airreg|N|740PA|disaster) named "Clipper Ocean Pearl" with 245 passengers and crew [ [http://www.asias.faa.gov/pls/portal/STAGE.AIDS_BRIEF_REPORT_PUB?EV_ID=19870310025169C&NARR_VAR= Aviation Safety Information Analysis and Sharing (ASIAS) Brief Report #19870310025169C] , Federal Aviation Administration, Office of Aviation Safety.] experienced an incident involving the forward cargo door. According to Pan Am and Boeingofficials who investigated this incident, the flight crew experienced pressurization problems as the aircraft was climbing through about 20,000 feet. The crew began a descent and the pressurization problem ceased at about 15,000 feet. The crew began to climb again, but around 20,000 feet, the cabin pressure altitude began to rise rapidly again. The flight returned to London. [http://amelia.db.erau.edu/reports/ntsb/aar/AAR92-02.pdf Aircraft Accident Report NTSB/AAR-92/02 (United Airlines Flight 811)] (PDF), National Transportation Safety Board, p. 57, adopted 18 March, 1992.]
When the aircraft was examined on the ground, the forward cargo door was found open about 1.5 inches along the bottom with the latch cams unlatched and the master latch lock handle closed. The cockpit cargo door warning light was off.
According to the people who examined the aircraft, the cargo door had been closed manually and the manual master latch lock handle was stowed, in turn closing the pressure relief doors and extinguishing the cockpit cargo door warning light. Subsequent investigation on N740PA revealed that the latch lock sectors had been damaged and would not restrain the latch cams from being driven open electrically or manually. It was concluded by Boeing and Pan Am that the ground service person who closed the cargo door apparently had back-driven (opened) the latches manually after the door had been closed and locked. The damage to the sectors, and the absence of other mechanical or electrical failures supported this conclusion.
Further testing of the door components from N740PA and attempts to recreate the events that led to the door opening in flight revealed that the lock sectors, even in their damaged condition, prevented the master latch lock handle from being stowed, until the latch cams had been rotated to within 20 turns (using the manual half-inch socket drive) of being fully closed. A full cycle, from closed to open, is about 95 turns with the manual drive system.
A similar incident occurred
24 February, 1989, with far worse consequences. United Airlines Flight 811experienced the loss of its cargo door after climbing out of Honolulu, Hawaii. The cargo door in this incident was lost in-flight, which caused a portion of the aircraft and 9 passengers to separate from the aircraft after explosive decompression.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Pan Am Flight 103 — Flight 103 redirects here. For other uses, see Flight 103 (disambiguation). Pan Am Flight 103 CGI impression of Clipper Maid of the Seas immediately after the explosion Occurrence summary … Wikipedia
125 (number) — 125 is the natural number following 124 and preceding 126.Number|number = 125 range = 120 cardinal = one hundred [and] twenty five ordinal = th ordinal text = one hundred [and] twenty fifth numeral = 125 factorization = 5^3 prime = divisor = 1, 5 … Wikipedia
Pan American World Airways — Pan Am redirects here. For other uses, see Pan Am (disambiguation). Pan American World Airways IATA PA ICAO … Wikipedia
Flight and expulsion of Germans (1944–1950) — Flight and expulsion of Germans during and after World War II (demographic estimates) Background … Wikipedia
United Airlines Flight 811 — Illustration of Flight 811 just after decompression Accident summary Date February 24, 1989 … Wikipedia
Northwest Airlines Flight 255 — Northwest Flight 255 Accident summary Date August 16, 1987 Type Pilot error/incorrect plane configuration prior to takeoff/taxi/System failure … Wikipedia
South African Airways Flight 295 — Accident summary Date 28 November 1987 Type In flight fire (cause undetermined and disputed) … Wikipedia
Continental Airlines Flight 1713 — Accident summary Date November 15, 1987 Type Loss of control due to icing Site … Wikipedia
Pacific Southwest Airlines Flight 1771 — Pacific Southwest Flight 1771 Illustration of N350PS, The Smile of Stockton Hijacking summary … Wikipedia
TWA Flight 800 — For the 1964 crash of a TWA Boeing 707 in Rome, Italy, see TWA Flight 800 (1964). TWA Flight 800 Recovered TWA 800 wreckage Accident summary Date … Wikipedia