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Detailed text transcripts for TV channel - MSNBC - 20120129:17:47:00

is that a critical piece of the 747 structure has cracked and expanded to the breaking point that it snapped. it s the aft pressure bulkhead, an umbrella-shaped structure toward the back of the plane. it s the device that keeps the pressure in the back part of the airplane contained properly. without that pressure, you can t pressurize the two and you wouldn t be able to breathe at 35,000 feet without the use of pressurized supplemental oxygen. the back of the airplane is getting a considerable amount of stress, not only from the pressurization, but also from the tail and all the stresses of flight. that bulkhead is very, very robust. it is a serious piece of structure. at the moment of the decompression, all the pressurized air for the cabin needs somewhere to go. it blasts back the cracked bulkhead, and unbeknownst to the pilot, the tremendous force

Aft pressure bulkheadWouldn tAmerican airlines flight 191Control problemsPressurized airCracked bulkhead

Detailed text transcripts for TV channel - MSNBC - 20120129:17:35:00

when any structural element of an airplane fails, the result can be fatal. a 747 has a cargo door blown out in mid flight. the decompression is so powerful it sucks two rows of seats and nine passengers out of the plane in a split second. this was taken from row 17 aisle seat. this video shot by bruce lambert two weeks after the fatal accident documents the aftermath of united airlines flight 811. investigators immediately know the problem centers on the cargo door. they can tell from the gaping hole where it used to be. the key question, why did it explode open, plummeting to the pacific ocean below? but the key piece investigators would like to examine, the cargo door itself, is lost at sea.

American airlines flight 191Cargo doorControl problemsBruce lambertAisle seatSplit secondGaping holeUnited airlines flight 811Pacific oceanCargo door itself

Detailed text transcripts for TV channel - MSNBC - 20120129:17:55:00

quite a distance from the crash site. so they gnaw it had departed the airplane earlier. now you begin to ask the question what could cause a decompression, control problems and loss of a vertical fin. reporter: looking at the plane s maintenance history investigators learned there was previous damage to the aft pressure bulkhead. that s the structure at the back of a cabin that keeps the cabin pressurized. it was cracked seven years before the crash. with the mane s tail accidentally dragged along the runway, in an incident known as a tail strike. the tail strike can occur in one of two phases of flight. either on takeoff where the airplane is on the runway and is beginning its initial climb or it can occur on landing where the airplane is in a tail load, high altitude. either way lit create some sort of damage. reporter: the repair of the cracked bulkhead is problematic. the structure is so large, more than 15 feet across the a plane was originally built around it.

Control problemsCrash siteAft pressure bulkheadAmerican airlines flight 191Take offTail strikeTail load

Detailed text transcripts for TV channel - MSNBC - 20120129:17:46:00

flight, there s a problem. they were in the middle 20,000 feet, which is where airplanes experience the most pressure on the vessel itself. at that point they received a door warning that a door was ajar which turned out not to be the case. we ve already seen how an airplane s fuselage expands as the plane goes up and contracts as the plane comes down. the altitude with the greatest pressure differential between the pressurized inside of an aircraft and the unpressurized atmosphere outside is right around 24,000 feet. that s where jal-123 experiences an explosive shock. a massive decompression for reasons that they didn t know. but the crew did not realize the amount of damage they sustained until very quickly, the airplane became less and less controllable to the point it was no longer controllable at all. that would be a nightmare scenario for a pilot. what the pilot s don t know

American airlines flight 191Door warningJapan airlines flight 123Pressure differentialControl problemsNightmare scenarioDont know

Detailed text transcripts for TV channel - MSNBC - 20120129:17:00:00

Detailed text transcripts for TV channel - MSNBC - 20120129:17:00:00
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Fuselage mid flightControl problemsFlight attendantPlane nosedives