Date: 22 Jul 99 23:30:35 From: firstname.lastname@example.org (Paul Saccani) Organization: Omen Internet in Perth, Western Australia References: 1
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On 10 Jul 99 02:33:31 , "James Fu" <email@example.com> wrote: >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. Weight. Usually, all gear is down for take off, unless TOW is low. By the time the destination is reached, fuel burn means the landing weight is less, and so the extra gear is not required. Only the long range DC-10 had the extra gear, BTW. It is not uncommon for MTOW to exceed MLW, BTW. Why bother having the extra MTOW gear and then stowing it for landing? Reduces wear and tear etc... So it is usual for the extra gear not to be used for landing, and a decision on it's use for take off is done on the basis of the TOW. This will often be specified on the printout the crew recieve with the company flight plan.