4-point Landing Gear Aircraft

Date:         10 Jul 99 02:33:31 
From:         "James Fu" <jamesfu@ibm.net>
Organization: AT&T WorldNet Services
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Why is it that pilots of aircraft with 4-point landing gear systems (nose,
center, and one each main) sometimes deploy only the nose and main points,
and not the center?  Naturally, aircraft like the MD11, DC10, and A340 are
the referenced aircraft here.