الأقســـام العسكريـــة

http://en.wikipedia.org/wiki/Lockheed_Martin_F-22_Raptor

1Aug 2012, announcment was made that the Combat Edge upper
pressure garment, connector hoses and valves was at fault; specifically, the breathing regulator/anti-G (BRAG) valve that inflates the vest

اقتباس :: 1Aug 2012, announcment was made that the Combat Edge upper
pressure garment, connector hoses and valves was at fault; specifically, the breathing regulator/anti-G (BRAG) valve that inflates the vest

يا عزيزي أنا من وضع هذا الرابط وأعرف ما فيه كما أنني عضو في
الـ Raptor newsletter وكما قلت لك العيب أصلح والنص الذي إقتبسته هو الإعلان
الرسمي عن السبب الذي "كان" مسئولا عن مشكلة الأوكسجين وتفضل حتى تتأكد هذا خبر
بتاريخ 30 يوليو عن وصول الطائرة لليابان يعني الأن اليابان و الإمارات:

اقتباس :: 22 Raptors Arrive in Okinawa

Richard_Dudley July 30, 2012 08:48 0 comments

One of eight F22A landing at Kadena AFB in Okinawa, Japan following the cross-ocean flight from the USA.
The
first contingent of United States Air Force (USAF) F-22 Raptor stealth
fighters arrived at Kadena Air Force Base located on Japan’s
southernmost island of Okinawa on 28 July. USAF leaders see this
deployment as an opportunity to demonstrate that the oxygen problems
that have plagued the F-22 have been resolved and to highlight the
safety and superior capabilities of the aircraft.
Eight of the
Lockheed Martin Raptors landed at Kadena early Saturday evening with an
additional four aircraft scheduled to arrive in the near future. The Air
Force has been quoted as saying that this deployment represents the
first step towards a return to “normal” operations. In flying to
Okinawa, the aircraft followed a flight path that ensured the pilots had
a landing site within range in case of an emergency and they flew at a
lower altitude to lessen the possibility of a repeat of the oxygen
problems that have led to the grounding of the aircraft in the past.
Secretary
of Defense Leon Panetta approved the deployment of the Raptors to Japan
and authorized an easing of flight restrictions on 24 July because, he
stated, the Air Force had identified the cause of the hypoxia mishaps
and initiated corrective measures to resolve the issue.
Recurring
incidents of hypoxia, resulting from a disruption in the flow of oxygen,
are believed to be attributable to a valve in the pilot’s pressurized
vest. The Air Force says that the valve would sometimes cause the
pressure vest to inflate and remain inflated creating a situation that
limited the pilot’s ability to breath. Corrective measures include
increasing the volume of oxygen reaching the pilot, replacement of the
affected valves, and removal of a filter designed to detect contaminants
in the aircraft’s life-support system.
In contrast to the recent
spate of intense Japanese opposition to the deployment of Marine Corps
MV-22B Ospreys to Okinawa, deployment of the F-22 Raptors has not
ignited any significant protests in Japan.

Based on the content of this article, you might be interested in the following posts:

http://defense-update.com/20120730_f-22-raptors-arrive-in-okinawa.html

وهذا خبر أخر بتاريخ 1-8
ما هي اقوى طائرة في العالم - صفحة 2 Transparent

اقتباس :: Air Force assures F-22 readiness following extensive testing
Posted 8/1/2012 Updated 8/1/2012Email story
Print story

by Amaani Lyle

American Forces Press Service

8/1/2012 - WASHINGTON (AFPS) -- Following
months of life support systems components testing in the F-22 Raptor,
officials have "determined with confidence" the source of previously
unexplained physiological incidents, the director of operations for the
Air Force's Air Combat Command said July 31 at a Pentagon news
conference.

Defense Secretary Leon E. Panetta last week approved a gradual lifting of restrictions he placed on F-22 flights in May.

The combined medical disciplines of flight medicine, toxicology,
physiology, human factors and occupational health have enabled the
service to assemble "pieces of the mosaic" that reside in the cockpit,
Maj. Gen. Charles W. Lyon, designated by Air Force Secretary Michael B.
Donley in January to lead an investigative task force, said at the news
conference. The general pinpointed the upper pressure garment, oxygen
delivery hoses, quick connection points and the air filter canister,
that had been used for a few months in the aircraft, as contributing
factors to previously unexplained physiological incidents in which some
pilots complained of hypoxia-like symptoms.

"As we completed end-to-end testing in the life support systems
components, we are able to piece together the contributing factors for
our previously unexplained incidents," Lyon said, crediting an
"integrated, collaborative approach by government and industry" in
helping the Air Force develop its findings. The task force, Lyon said,
leveraged the investigative efforts of numerous safety investigation
boards and the Air Force's Scientific Advisory Board to eliminate
contamination as the root cause of the incidents.

Air Force officials used intensive altitude chamber and centrifuge
protocols to isolate variables in the flight gear and cockpit
connections, the general said. They also analyzed thousands of samples
of gases, volatile and semi-volatile compounds, solids and liquids, and
compared that data to occupational hazard standard levels.

"Managing risks to our F-22 force has always been pre-eminent as we work
through this complex set of factors," Lyon said. "In the end, there is
no 'smoking gun.'"

The fleet, grounded for five months last year, has flown nearly 8,000
sorties totaling more than 10,000 flight hours since its last reported
unexplained incident in March, Lyon said.

In a recent update to Panetta that led to the decision to roll back the
restrictions, Air Force officials said the service employed thorough,
in-depth analysis to eliminate contamination as a contributing factor to
its most recent incident and charted a path to eliminate all
significant contributing factors today and in the future.

"We left no stone unturned in the investigative process," Lyon said,
adding that the service will continue to move forward with enhancements
and fixes as NASA concludes an independent investigation.

The Air Force's investigative process also involved canvassing the F-22
communities to gauge pilot, maintainer and family member confidence in
the aircraft's safety, Lyon said.

"I recently visited our F-22 bases, and I can tell you, their confidence
is high," he said, noting that no hybrid high-altitude flight
operations and high-maneuverability aircraft could be completely immune
to such incidents. "There's no other aircraft our pilots would rather
fly in the service of our nation," he added.

Panetta has authorized the deployment of a squadron of F-22 aircraft to
Kadena Air Base, Japan, under altitude restrictions using the northern
Pacific transit route. Upon completion of that mission, the Air Force
likely will approve most long-duration flights, service officials said

.

الموقع الرسمي للقوات الجوية الأمريكية

اف 22 اقوى ما موجود حاليا ولكن احساسى ان JF-20 ستتقدم عليها

اخي الطائرات تختلف عن بعضها البعض في المهام لدى لو تبحث عن قادفة قنابل متوسطة المدى ستجد سو-34 وا
دا تبحث عن طائرة اعتراضية هناك ميغ-35 وادا تبحث عن مقاتلة متعددة المهام تجد ف-22 و سو-35 و التايفون لكن هده المقاتلات كلها لها ايجابيات وسلبيات حيث ف-22 هي الاقوى في العالم الى انها تعاني من التكلفة ونقص عمر الطائرة اما سو-35 تكلفة اقل لكن ليست بقوى ف-22 ونفس الشئ للتايفون لدى لكل دولة لها استراتيجية ولها مقاتلة تعتبر لها الاقوى عالميا.

ا

اقتباس :: خي الطائرات تختلف عن بعضها البعض في المهام لدى لو تبحث عن قادفة قنابل متوسطة المدى ستجد سو-34 وا
دا
تبحث عن طائرة اعتراضية هناك ميغ-35 وادا تبحث عن مقاتلة متعددة المهام
تجد ف-22 و سو-35 و التايفون لكن هده المقاتلات كلها لها ايجابيات وسلبيات
حيث ف-22 هي الاقوى في العالم الى انها تعاني من التكلفة ونقص عمر الطائرة
اما سو-35 تكلفة اقل لكن ليست بقوى ف-22 ونفس الشئ للتايفون لدى لكل دولة
لها استراتيجية ولها مقاتلة تعتبر لها الاقوى عالميا.

كلام سليم فيما عدى نقطة ال F22 فهي طائرة سيادة جوية في الأساس وليست طائرة متعددة المهام مثل ال F35 ولكن السؤال هنا عن الأقوى في الجو ولهذا الإجابة سهلة ومحددة ...
ونقطة التكلفة هي نقطة سليمة 100% فعلا الرابتور تكلفة تشغيلها أعلى وبفارق عن أي
مقاتلة أخرى ولكن هذه ليست بالمعضلة بالنسبة لأمريكا المستخدم الوحيد للطائرة الغير
قابلة للتصدير فأمريكا ماديا قادرة على تحمل نفقات الرابتور خصوصا أنها تقدم لها نقطة
تفوق كبيرة جدا في قوتها الجوية ...نقطة تفوق تستحق المصاريف الإضافية !

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