Air
Force leaders admitted to Congress Thursday the service was wrong not
to immediately install a backup oxygen system and is only now getting
around to making fixes to the F-22’s oxygen schedule recommended in
2005.
The Air Force has spent the past two years trying to
determine why their F-22 pilots suffer hypoxia-like symptoms in flight
with many reporting feeling light-headed, weak and nauseous. Service
officials have repeatedly grounded the F-22 fleet as the fifth
generation fighter still flies under altitude and distance restrictions
because of fears for pilots’ safety.
Air Force Maj. Gen. Charlie
Lyon, Air Combat Command’s director of operations, Clinton Cragg,
principal engineer at NASA’s Engineering and Safety Center, and
retired Air Force Gen. Gregory Martin, head of Air Force Scientific
Advisory Board study on the F-22’s problems, each testified before
Congress on the steps the Air Force has taken to make the F-22 safer.
Cragg joined the hearing because NASA, along with the Navy and Marine
Corps, has aided the Air Force in its research.
Air
Force leaders had declared that they have identified a the culprits
causing the problems for pilots to include the breathing
regulator/anti-g (BRAG) valve on the Combat Edge upper pressure garment.
The Air Force is replacing the valve, installing a new back-up oxygen
system and changing the oxygen schedule for the F-22’s onboard oxygen
generation system (OBOGS).
Engineers and scientists had
recommended the Air Force change the oxygen schedule for the OBOGS in
2005. The Air Force chose not to. The changes being made now are more
comprehensive, Lyon said.
Martin also told Congress the Air Force
should have installed a back up oxygen system. Original designs for the
F-22 included the back up system, but they were scrapped in order to
save weight.
“In retrospect, that was not an appropriate decision,” Martin said.
The
Air Force expects to have the first back up oxygen systems installed by
January and finish the install to the rest of the fleet by 2014.
At
the beginning of the Air Force’s investigation into the F-22, officials
suspected the breathing problems were caused by toxins getting into the
cockpit. Cragg said his NASA scientists agreed with the Air Force’s
conclusion that this was not the case.
Martin made a pitch during
the hearing to Congress to re-invest in the Air Force’s human systems
integration program. He said some of the problems found in the
investigation of the F-22’s oxygen system could have been caught
earlier. He blamed down sizing of the military in the 1990s.
“Flight
medicine, aviation physiology, and research and development atrophied
significantly in those years, at the time the airplane was going into a
different environment,” Martin said. “All the people that would normally
have done the testing and evaluation and all the things we do to learn
about those environments were no longer in the military, no longer in
our civilian workforce.”
Sumber:Defensetech
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