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NASA and McDonnell Douglas researchers

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are developing and testing ideas to make

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aircraft safer using NASA's f-15 test

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vehicle propulsion controlled aircraft

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software or PCA software is being tested

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at NASA's Dryden Flight Research

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Facility if the complete hydraulic

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system on an aircraft fails the PCA

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software takes over providing enough

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engine control power to steer and safely

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land the vehicle until this breakthrough

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a complete hydraulic failure basically

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rendered a normal aircraft

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uncontrollable here's how the PCA

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software works the propulsion controlled

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aircraft or PCA system uses a mixture of

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common sensor signals and the pilots

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pitch and roll commands to adjust the

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throttles and keep the plane on course

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the software generates collective or

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equal throttle commands for the engines

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without this PCA system throttle only

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control is virtually impossible on an

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aircraft here the pilot is trying to

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maintain a steady approach by manually

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controlling the throttles now with the

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PCA system on the aircraft is steadied

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and is actually taken to a safe

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touchdown at Dryden April 21st 1993

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without using conventional flight

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controllers piloted real-time md-11

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simulations incorporating this PCA

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technology are currently underway these

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tests show that with a PCA system

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installed the simulated md-11 commercial

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aircraft can be safely landed without

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conventional flight controls this will

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be invaluable on military and commercial

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aircraft of the future NASA and the

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aviation industry will continue to work

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towards a safer more controllable

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aircraft in the future PCA technology is