| Whence
formulae? |
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| • | “There
have been two pilot reports |
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| received
which indicated that TCAS had |
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| issued
Descend RA's at approximately 500 |
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| feet
AGL even though TCAS is designed |
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| to
inhibit Descent RAs at 1,000 feet AGL. |
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| All
available data from these encounters |
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| are
being reviewed to determine the reason |
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| for
these RAs.” –TCAS web |
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