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Interested in this product? Reporters interviewed more than 50 people who were in elevators at the time the jets hit or moments before. The newspaper also reviewed 2, pages of accounts written by survivors and reports in other media outlets, examined architectural plans, and spoke to elevator experts and mechanics who worked at the Trade Center. The result is the first in-depth look at an important but neglected part of the World Trade Center disaster.

To comply with building codes, the World Trade Center since had been adding locks that made it impossible for passengers to force open the doors of stalled elevators. These locks, called "door restrictors," had been added to about half of the elevators in the twin towers. Nobody is known to have escaped from an elevator locked by a door restrictor. The World Trade Center followed a long-established approach to elevator rescues: Leave people inside stalled elevators until professionals can perform rescues.

The elevators had three mechanisms, including the restrictors, designed to prevent people from accidentally falling down elevator shafts. An untold number were still trapped when the buildings collapsed. Most elevators, even those on low floors, stopped functioning the moment the jets hit. In a fire emergency, an elevator is programmed to return to its lowest floor and hold its doors open. On Sept. The reason for this failure is unclear. Some elevators returned to their lowest floors but didn't open.

That made it hard for firefighters to know whether elevators had returned to lobby floors or were stalled somewhere higher. The doors of nearly 50 elevators in the north lobby alone were closed. Firefighters failed to inspect elevators with closed doors, even those closest to the command post in the north tower lobby. Eight passengers escaped from these elevators on their own; one man did so just five minutes before the building collapsed.

Eighty elevator mechanics were on duty in the towers that morning, many just a few steps from people who needed to be rescued. However, the mechanics, fearing for their safety, evacuated on their own initiative when the south tower was struck at a. A supervisor from the Port Authority of New York and New Jersey, which owned the World Trade Center, radioed the mechanics about 45 minutes later to say firefighters needed their help.

The south tower collapsed as two supervisors were on their way back. Elevators are the safest form of mechanized travel when measured by trips taken: Only about a dozen passengers die in billion trips made annually in , elevators in the USA. Most deaths are caused by falling down shafts. Despite common fears, only once before had a passenger elevator had all its cables severed and fallen to the ground, according to Elevator World. That happened in when an elevator fell 78 stories after a military plane hit the Empire State Building.

The woman inside lived. Before Sept. Although 30 years old, the system remained a worldwide tourist attraction for people in the elevator industry. Trade publications wrote about the elevators with a romanticism never bestowed on the taller Sears Tower in Chicago or other skyscrapers.

The World Trade Center elevator system had a revolutionary design that made it possible to build story towers. The elevators were big and fast and used far less floor space than earlier designs.

The elevator system was the first to require people to take two elevators to reach most upper floors. Passengers took nonstop express elevators from the ground floor to elevator lobbies on the 44th and 78th floors. There, they walked across a hall to smaller local elevators that went to higher floors. It could take five minutes to get from the ground floor lobby to the th floor.

Each tower had only two passenger elevators that went nonstop from bottom to top — to the Windows on the World restaurant in the north tower and the observation deck in the south tower. The big benefit was economic. Until the World Trade Center, the height of skyscrapers had been limited by the space needed for elevators that went from the lobby to every floor. By requiring transfers, the World Trade Center cut in half the number of elevator shafts needed, so more floor space could be leased.

Most came to a stop after their tower was hit. Elevator doors were nearly impossible to open unless a car was within 18 inches of a floor landing. Often, the elevator had to be within 3 inches of a landing before all door locking mechanisms would release. The twin towers had 15 miles of elevator shafts. But only 1. The odds of being near a landing were not good. To get out of an elevator, a passenger had to pass through two doors and be near a landing.

The inside door was attached to the elevator car itself. The outside door was part of the building, keeping people in hallways from stepping into an elevator shaft. A motor on the elevator car roof opened both doors simultaneously when the elevator reached a landing. People stuck inside elevators had to contend with locks on both sets of doors.

The lock was activated when a properly working elevator left a landing. If the elevator stopped suddenly or lost power, the restrictor made it impossible to open the inside door more than 4 inches.

The lock could be released — and the doors opened fully — only from the elevator car's roof. Several strong passengers could overpower these motors. A loss of electrical power also could free the doors. This made it difficult for bystanders to help people stuck in elevators. But it was possible for people in an elevator to release this lock if they had been able to open the inside car door first.

The release mechanism for the interlocks was on the shaft side of the door. TMT Rewards. TMT Digital Edition. TMT Channel on the L! Rockspeed Elevators, ACE medical centers sign agreement for lifts supply. Read Next.

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