Helicopter loss in bin Laden raid
U.S. officials said the helicopter was destroyed during the mission in Pakistan was a more recent version of two Sikorsky UH-60 Black Hawks were shot dead during a raid in Somalia in October 1993 killed 18 soldiers.
In Pakistan, the helicopter packed with soldiers was a "controlled landing, but difficult," after experiencing higher temperatures than expected bin Laden's compound near Islamabad, said Senator Dianne Feinstein reporters on Tuesday.
The accident was not unusual, said military experts.
crashed dozens of U.S. helicopters were shot or in Afghanistan and Iraq, contested by high temperatures and sandstorms that reduce the viability of the aircraft is driven by the rotors. In mountainous Afghanistan, there is the additional difficulty of flying at high altitudes.
"Helicopters are much more reliable than they were in the 1950s, but unfortunately they are still very sensitive to the environment," Joseph Trevithick, an analyst at globalsecurity.org Web site said.
The Pentagon is still investigating the problem in the attack on Bin Laden, but not the helicopters damaged by enemy fire, said an official of the defense, was not entitled to the record. Officials said they had suffered a mechanical failure.
U.S. forces quickly destroyed the Black Hawk, to avoid the built Sikorsky Aircraft, a subsidiary of United Technologies Corp., one of his sensitive equipment from falling into enemy hands, "said the official defense.
Unlike fixed-wing aircraft, helicopters tend to crash when they suffer damage to a single region, "said Trevithick.
Helicopter problems forced the U.S. military to another high-profile mission in 1980 to cancel - an attempt to rescue American citizens held hostage in the American embassy in Iran.
"They tortured them. Many lessons were learned, including the need for additional helicopters to complete the mission, and rescue helicopters, said John Pike, founder of the Web site globalsecurity.org.
However, helicopters have enormous benefits for the military, troops and cargo in areas where few roads exist are mined with explosives transport and provide commanders the opportunity to get closer to targets.
On World Mission Sunday, two Black Hawk helicopter hovers over the link bin Laden and descending to the Marine Special Operations Forces on the ground.
including the 17 degree temperatures were higher than expected - - If one of the helicopters had problems and suddenly country, two Boeing Co Chinook helicopters were called in to help get the U.S. troops, said an official of the U.S. government, says the condition of anonymity.
A Chinook would have been enough, but a second was sent in case the helicopter has trouble, "said Pike.
A retired military helicopter pilot said the Black Hawk is probably a condition called "settlement with power" when high temperatures, high pressures and high altitudes force an unscheduled landing. "These terms only suck the speed of the rotor, he said.
Sikorsky Black Hawks, who are generally believed a range of 360 miles, to be reliable and have real work horse in the last decade of the war, said an adviser to the Congress.
A subcommittee of the House Armed Services should complete a spending bill for fiscal year 2012 includes $ 1,300,000,000 for 71 new UH-60 Black Hawk.
The Black Hawk, the first with flying in 1978, a crew of three or four and can carry 11 soldiers equipped for battle. It has a maximum gross weight of 22,000 kg and can be up to 9,000 pounds of external load hook. It has a top speed of 187 miles per hour.
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