PPRuNe Forums - View Single Post - CAT II/III - why with reduced flap setting?
Old 7th January 2011 | 17:06
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A380 Jockey
 
Joined: Jan 2011
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From: In a bunk at 40,000 ft
GP,
Most large,modern jets are flown low vis approaches with 'max landing flaps',so as to enable max forward/slant vis when and if the pilot breaks visual. The thrust available on these modern jets for their certified max landing weights is normally more than enough to meet the required go around climb gradient(s) required in the worst of conditions ie high temps,low pressure,high altitude and high terrain in GA path. This however may not ALWAYS be the case. Wherein,a lower flap setting IS used as normal procedure,on a field to field basis.
However,in the case of corporate jets and/or general aviation aircraft,this may not necessarily be the case. MOST airfields would have higher GA climb gradient than can be achieved by the smaller engines for their certified max landing weights. Therefore the need to NORMALLY use a lowr than optimum landing flap. Most importantly,the forward and slant visibility on a small corporate jet is much better than that of a larger passenger airliner,with both using their respective 'normal' landing flaps. This is because the angle of attack of say a 77W would be far higher than say a citation 5 in similar conditions for landing. Thus the need to enhance the forward/slant vis in larger jets.
Hope this helps..
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