A320 windshear sys
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A320 windshear sys
hello !! In the a320 to get predictive windshear , one of the requirement is to have the atc on , so why is the atc needed to b on for predictive winshear to activate ????' ( for ref: fcom vol 1 ch -navigation ws sys part )
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So that the PWS switch only activates the wx radar transmissions when there is a reasonable chance that the a/c is taxying for T/O, and not just having an engine run?
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thnx . so basically the atc helps the wx radar o know dat shes taking off right ?? nd cud plz tell me where i cud find this written info ?? thank you
milo
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Nothing clever like that - merely my deduction. Four conditions for PWS to be on:
1. a/c below 2300 ft agl
2. PWS switch in AUTO
3. Either engine is running.
Now this might be the case on an engine run by a ground engineer - which would mean that the radar is transmitting even though the switch is OFF. This is undesirable.
So another condition - ATC on - is included. This implies there are pilots in the cockpit taxying out for take-off. Make sense?
1. a/c below 2300 ft agl
2. PWS switch in AUTO
3. Either engine is running.
Now this might be the case on an engine run by a ground engineer - which would mean that the radar is transmitting even though the switch is OFF. This is undesirable.
So another condition - ATC on - is included. This implies there are pilots in the cockpit taxying out for take-off. Make sense?
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@Typicocard corr:TyroPicard
Why would the PWS switch be in auto position in the case on an engine run by a ground engineer? Shouldn't it be at off position, like the ATC switch?
Why would the PWS switch be in auto position in the case on an engine run by a ground engineer? Shouldn't it be at off position, like the ATC switch?
Last edited by aristoclis; 4th Aug 2009 at 18:21.
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@Typicocard
TyroPicard wrote
Now this might be the case
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That's what happens with late night posts!
Although what you say makes sense, if I remember well WX radar (not PWS) operates on ground with switch on without other precondition (engine running). Suppose you (or engineer) forget this switch at on, many guys would be "illuminated" as well, wouldn't they? Why no extra protection here then?
Although what you say makes sense, if I remember well WX radar (not PWS) operates on ground with switch on without other precondition (engine running). Suppose you (or engineer) forget this switch at on, many guys would be "illuminated" as well, wouldn't they? Why no extra protection here then?
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Maybe because there is no cockpit indication of the predictive windshear being in auto, whereas with the weather radar you would get the tilt info and some kind of return on the ND. With the predictive windshear the only indication I recall is the amber ECAM MEMO when it is switched OFF during taxi. Off course this is only speculation on my part, there is nothing in the books.
