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JSACKS

Landing callouts disappear in 744....

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I just did a landing at Haneda in the 744 and took off again on a hand flight after slewing to the departure runway. All went well on a low level sightseeing flight around Tokyo but on descent and approach, there were no GPWS callouts at all. Is this normal? Or did I fail to re-set something? Or must one be at some minimum altitude to trigger them for descent and app?Jonathan

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"Or must one be at some minimum altitude to trigger them for descent and app?"Yes :)The system is designed to reduce nuisance repeat callouts (as you would get when flying over uneven surfaces).During go-around, the callouts are inhibited until the aircraft has reached a particular height/altitude. Note: There have been debates on what that height/altitude is... Some say it has to be above the first callout (e.g. 2500'AGL). Some say that the aircraft has to fly above a fixed altitude, e.g 4,500' (above the airfield).Cheers.Q>

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