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Thread: 737 autoland
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Old 27th February 2004 | 18:47
  #5 (permalink)  
FlightDetent

Only half a speed-brake
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Joined: Apr 2003
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From: Commuting not home
Ph_X: Judging from your profile, it is beneficial that you know.

So,
on a 737 (-3/4/500 in my case) approach on autoland would normally be a dual (i.e. ALL) channel approach that legally and technically prepares the AFDS for an autoland. Remember, both APs can only be engaged above 800ft RA. Then, the segment between 800' and 50' is an approach on autoland. In case you had a soul on board in need of urgent medical care, this may put you in a LVO overweight situation, see above.

Also, it is worth a mention, that your every-day single AP APCH is also an approach on autoland, since should you all of a sudden forget to fly, single channel WILL flare and land just as properly as any pilot, albeit without the system performance integrity monitoring associated with dual channel operation.

Strangely enough, CAT II manual landing is also approach on autoland, since your DH is at 100', but below approx 140' (on all approaches) the AFDS already is on autoland regime! This is best witnessed if either/all glideslopes fail, as nothing happens because vertical guidance is already provided by RA only.

Cheers t(w)oo,
FD.


At the end, you haven't been just a quibbler, have you?
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