Page 7 - Control Problems News Today : Breaking News, Live Updates & Top Stories | Vimarsana

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 pacifi...

>> 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 ...

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 deco...

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Pressurize the tube 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 blows the vertical fin and other parts of the tail secti...