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Old 21st February 2009 | 20:23
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From: dubai
B777 Pws

The AMM states :
PWS inhibits new windshear cautions during takeoff and
approach if both these conditions exist:

* Airspeed more than 80 knots
* Less than 400 feet radio altitude.

The use of the word "new" is baffling me a little every time I read this section.

Example 1 : If a PWS "MONITOR RADAR DISPLAY" alert is issued at say, 70 knots and the PIC elects to continue as per NNM, and then a new windshear EVENT occurs in a different location of the caution area at 90 knots, will a PWS " MONITOR RADAR DISPLAY " OCCURR ?

Example 2 : At 90 knots a windshear event occurs, will an PWS caution alert be issued ?
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Old 22nd February 2009 | 01:00
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1) no
2) no
FE Hoppy is offline  
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Old 22nd February 2009 | 03:29
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From: dubai
Thanks FE, but why would they use the word " NEW ", why not just say during that period all PWS Alerts are inhibited.
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Old 22nd February 2009 | 04:37
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From: Australia
"NEW" meaning atmospheric events detected AFTER the inhibit conditions have been met. The previous events detected remain active.

Regards,

Old Smokey
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