North Korea's rocket...gone in 81 seconds
April 13th, 2012
12:42 PM ET

North Korea's rocket...gone in 81 seconds

New details emerged Friday about the failed launch of the North Korean rocket. The rocket failed in the second stage of its flight, Pentagon spokesman George Little said Friday.

A different U.S. official told Security Clearance that the rocket failure happened 81 seconds into the flight, based on preliminary U.S. analysis.

The first stage successfully separated from the rocket before the failure, the U.S. official said. That first stage fell into the Yellow Sea approximately 165 kilometers (about 100 miles) west of Seoul, South Korea, according to a statement from U.S. Northern Command and North American Aerospace Defense Command.

Based on the U.S. government information, it appears the first stage dropped "well east of the intended path," according to analyst David Wright from the Union of Concerned Scientists.

The U.S. are analyzing "precisely what happened along the trajectory," Little told reporters at the Pentagon on Friday.

Apollo 13
April 13th, 2012
10:24 AM ET

Apollo 13

"NASA's Apollo 13 was slated to be the United States' third lunar landing mission. It launched April 11, 1970, at 2:13 p.m. EST from Launch Pad 39A in Florida. From left to right are mission commander Jim Lovell, command module pilot John Swigert and lunar module pilot Fred W. Haise.

The mission was aborted after the service module oxygen tank ruptured. Still, the mission was classified as a "successful failure" because of the experience gained in rescuing the crew.

As the crew finished a 49-minute TV broadcast showing how comfortably they lived and worked in weightlessness on the evening of April 13, Lovell finished the interview stating, "This is the crew of Apollo 13 wishing everybody there a nice evening, and we're just about ready to close out our inspection of Aquarius and get back for a pleasant evening in Odyssey. Good night."

Nine minutes later, oxygen tank No. 2 blew up, causing the No. 1 tank to also fail. The command module's normal supply of electricity, light and water was lost. The crew was about 200,000 miles from Earth.

After an intensive investigation, the Apollo 13 Accident Review Board identified the cause of the explosion. In 1965, the command mudule had undergone many improvements that included raising the permissible voltage to the heaters in the oxygen tanks from 28 to 65 volts DC. Unfortunately, the thermostatic switches on these heaters weren't modified to suit the change. During one final test on the launch pad, the heaters were on for a long period of time. This subjected the wiring in the vicinity of the heaters to very high temperatures (1,000 degrees F), which were subsequently shown to have severely degraded the Teflon insulation. The thermostatic switches started to open while powered by 65 volts DC and were probably welded shut. Furthermore, other warning signs during testing went unheeded and the tank, damaged from eight hours of overheating, was a potential bomb the next time it was filled with oxygen. That bomb exploded on April 13, 1970 - 200,000 miles from Earth.

The Apollo 13 crew safely landed in the Pacific on April 17, 1970."

Source: NASA

Filed under: Light up the screen


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