USAF Indefinitely Grounds F-22 Raptors
http://www.youtube.com/watch?v=8dly6DQ0fNA
The On-Board Oxygen Generating System has been under investigation since a November 2010 crash in
Alaska. (File photo / U.S. Air Force)
The On-Board Oxygen Generating System (OBOGS) has been under investigation since an F-22 crashed in November just outside Joint Base Elmendorf-Richardson, Alaska. Until the stand-down, Raptor sorties had been restricted to an altitude of 25,000 feet or below for training missions because of the potential malfunctions.
The limits were "designed for mishap prevention and is a prudent measure to ensure the OBOGS are operating safely," ACC spokesman Col. William Nichols said in March, when the command first publicly disclosed the investigation.
An OBOGS malfunction can be potentially life-threatening, said Hans Weber, who sat on the U.S. Federal Aviation Administration's Research, Engineering and Development Advisory Committee, and is president of Tecop International, a San Diego consulting firm.
"It's a big deal if you're at high altitude and you run out of oxygen," Weber said in a March interview.
At 50,000 feet, a human being has less than 10 seconds of useful consciousness, he said. The 25,000-foot altitude restriction would allow the pilot to quickly dive below 18,000 feet, where the atmosphere has enough oxygen to ensure prolonged survival in case of an emergency.
"It would take you so long when you're way up high, you may black out before you make it to a safe altitude," Weber said
http://www.defensenews.com/story.php?i=6423637&c=AME&s=AIR
مختصر الخبر
أوقفت القوات الجويه الأمريكيه مقاتلة الجيل الخامس الحديثه F-22 Raptors عن الطيران
حتى إشعار أخر وجاء الأمر من الجنرال وليم فريزر قائد القوات الجويه الأمريكيه
وجاء الأمر بإيقاف الطائرات يو 3 مايو الحالى وهذا ما قالته الكابتن جنيفر فرى
المتحدث الرسمى بإسم القوات الجويه
وقالت المتحدثه لا نعلم ما هو الوقت الذى ستظل فيه المقاتله خارج نطاق الخدمه
وترجع الأسباب
إلى تحطم مقاتله من هذا الطراو فى ألاسكا فى نوفمبر الماضى
وتحقيقات الحادث ترجح أن العطل بسبب نظام توليد الأوكسجين
Oxygen Generating System (OBOGS)
