| 21. | One is where the radar has bounced microwave energy off the skin of a plane and recorded an echo, called primary radar.
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| 22. | As in all primary radar systems, the radiation reflected off a target is analyzed to produce a radar map on a screen.
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| 23. | "Controllers at NEADS located an unknown primary radar track [ Flight 77 ], but " it kind of faded " over Washington.
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| 24. | The lack of any authentication within the standard makes it mandatory to validate any received data by use of the primary radar.
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| 25. | ""'Controllers at NEADS located an unknown primary radar track "'[ Flight 77 ], but " it kind of faded " over Washington.
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| 26. | The bearing derived from the main primary radar would enable a reading of the height to be sent back to the operator.
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| 27. | In Olathe, FAA officials said they took the primary radar display system down for maintenance every Saturday night, a relatively slow period.
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| 28. | These primary radar hits might be indicative-- and I emphasize might be indicative-- of something coming off Flight 261 near this point,
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| 29. | In the late nineties, the installation became remote operation, and the primary Radar was replaced with the British Aerospace ( BAe ) Type 101.
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| 30. | These primary radar hits might be indicative _ and I emphasize might be indicative _ of something coming off Flight 261 near this point,
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