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Reply #2: The radar coverage on the NASA pdf is for 5000 ft above ground altitude. [View All]

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gbwarming Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Feb-05-05 06:36 PM
Response to Original message
2. The radar coverage on the NASA pdf is for 5000 ft above ground altitude.
Edited on Sat Feb-05-05 06:50 PM by gbwarming
If coverage is blocked at 5000 ft due to terrain it may still be longer range at higher altitudes which all the flights were at when the hijackings occured.

"This diagram is for rough planning of radar coverage. It does not consider aircraft size or most environmental influences. The radar performance limitations may be influenced by the radar cone-of-silence and the radar processor range limitations"

These were big airplanes.

Does the FAA say they ever lost primary coverage when they reviewed the tapes? I think not, even for 77 where the coverage is admittedly poor. I recall that 77 didn't show up on the controllers scopes for a time due to a software flaw even though there was a primary return that could later be traced back from DC.

Merc?

PS. One more thing. That site claims the flight tracker software gets radar data from the FAA. If that's the case the HOW HOW HOW did they get the tracks of all those flights with their transponders turned off and no primary return? Doh!
pps. oops, Nevermind. Their tracks just ended when the transponders went off or went into coast mode (in the case of 77).

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