The ill-fated valve F-22 fighter

In late July, the month, U.S. Defense Secretary Panetta L. signed a decree according to which the Air Force has the right to remove all restrictions on the operation of fighter Lockheed Martin F-22 Raptor. The premise of this order was the end of the investigation a number of incidents with the on aircraft, one of which has even led to the death of the person. All identified problems did the life support system pilot.

The ill-fated valve F-22 fighter

The saga began around avionics November 16, 2010, when the pilot drill J. Haney, performing flight Over Alaska, lost consciousness and crashed. The investigation of the incident revealed that the premise of the disaster was the failure of regeneration of oxygen OBOGS. Regenerator at one point shut down, and pilot did not have time to include backup system EOS. After asking the prerequisites death Haney introduced a number of amendments to the structure and working methods of on-board equipment, namely, spare respiratory system now cut one machine. It is believed that due to the modernization of the U.S. Air Force itself has escaped several incidents that could end in disaster.

But dim spare EOS system is not free from all problems. The pilots continued to be choking at times, making it difficult to work and longed for a risk. Search the circumstances of the ongoing problems led to a "charge" altitude-compensating a suit Combat Eagle. It was found that the control system supercharged a suit does not always work synchronously with the respiratory apparatus and occasionally incorrectly responds to act on the pilot overload. For this reason, an overload of the chest pilot can turn the compressed harder than necessary, while this effect lasts for a while and after exposure overload. The consequence of these problems was the so-called pulmonary atelectasis — a phenomenon in which the bronchioles and alveoli spadenie person. Atelectasis pulls the wrong gas exchange in the lungs, which may be a precursor of hypoxia. In addition, within a few days after the alveoli wears off a person should not be subjected to any harsh loads up to full light.

Difficulties in life-support systems to be installed in the F-22 has been implicated in a string of restrictions on the flight modes. First, after the death of J. Haney, for a number of days of flying "raptors" were completely discontinued. Later, they were allowed, but limited by the speed and altitude. In March 2011, the speed limits canceled, but rebuked rise above 7600 meters. A prerequisite for such an order was a recommendation for pilots: in the case of problems with the respiratory system, they had to go into a dive and as soon as possible to come down to such a height that can be more or less normal breathing even with the depressurized cabin. A few months later, the allowable flight altitude was raised to 13 km. Finally, on May 15 this year, and restrictions were placed on the flying range: to avoid accidents routes were run in less than half an hour's flight to the coming airfield. Of course, that such a framework is seriously hit on the combat potential fighters F-22. In light of the overall design style prepyadstviya with life-support systems can thus look weird way, including a diversion.

July 24 the official dealer of the South American Defense Department J. Little announced the end of the investigation into all incidents. From his words, it follows that all the past prepyadstviya not been resolved earlier due to an inclusive temper problems. The first precondition to tragedy became a design flaw valve altitude-compensating a suit. Due to incorrect design, the valve allows air to freely upon inflation, but failed to pay tribute to the speed bleed. Because of this, after the cessation of exposure overload pilot continued to be subjected to the pressure of a suit. Of course, the normal breathing was problematic. Breathing is facilitated and another drawback systems. It was found that the respiratory system is based on the flight mode and loads the pilot is fed into the mask is the same number of respiratory consistency. Under normal flight "on box" is a feature OBOGS remained unnoticed, but when maneuvering with bolshennymi congestion is fully manifested.

According to the results of investigation into the circumstances of hypoxia in pilots adopted the programm upgrade F-22 fighters, the result of implementation of which should be fully rid of the current problems. First, the complex life support will be introduced so-called "System 911. " It will automatically look for the pulse of the pilot and the level of oxygen in his blood. In the event of these characteristics, the permissible scope of the pilot and the controller will receive a corresponding message. In addition, "System 911 "will allow the pilot to quickly and simply to inform the flight control early signs of dizziness and other symptoms of hypoxia. Also in the "System 911" there is some equipment that will help rapidly and is not dangerous to land on near the airport. Defined by its composition and method of operation is not yet named.

Please illumine 2012 all the "Raptors" will be equipped with refreshed complex life support. In its upgraded version will take into account all the current problems, also introduced a number of new modules. It is expected that in the process of converting all the aircraft all the same will just get rid of hypoxia, atelectasis, and other problems. All the same, the installation of the new systems will claim a certain time, and the aircraft must be on duty constantly. In this regard, Chief of Staff of the U.S. Air Force H. Schwartz said the temporary retaining restrictions on height and range to complete the modernization of aircraft. But until that time, pilots will only maintain flight form, but do not develop new weapons or methods of aerial combat.

It is reported that recently, all flights will be operated without the use of high-altitude pressure suit and at low altitude. Namely, such a specifically makarom Squadron F-22 go to Kadena Air Base (Okinawa, Japan). Fascinating route for South American fly airplanes. It paved so that at least some of the terms can be compared quickly fly to some island in the Pacific Ocean. According to reports, the largest flying time before the coming of land does not exceed 80-90 minutes. At several points in the route fighters refueled in the air from the tanker planes. On board the latter will be experienced flight instructor who understand the F-22 as its five fingers. According to the flight plan, if necessary, they will likely have to provide all assistance to the pilots in the cockpits of "raptors".

These flights of F-22 fighters to resume no earlier than September-month. At the same time, most likely, will be placed first data on the results and conclusions of the respective Commission concerning the likely prospects of all types of aircraft. The Pentagon put their trust that refreshed complex life support which is currently on trial, one hundred percent will solve all prepyadstviya breathing. If the upgrade does not give tribute to the result, it may be that the work will continue to improve. This assumption is based on the economic side of the F-22 project. These fighters have already invested about 75 billion dollars. Hardly South American military zahochut that the results of these investments was nedovedenny plane with critical neuvvyazkami. Because the history of the F-22 has not yet unfi
nished and will soon be followed by new action.

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