Date: 23 Dec 98 03:53:02 From: "Michael F. Lechnar" <email@example.com> Organization: nams References: 1 2
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PS2727 wrote: > Not all long range airplanes have dump systems. The 767 and 757 are long range > and yet most do not have dump capability. Only 767-300 models and then not all > 300's. All aircraft must demonstrate a landing with a max fuel load anyway > (even when they have a dump system) to be certified. If an overweight landing > is made a maintenance inspection must be done. The FAR's describe when dump > systems are required and I believe Boeing obtained a waiver to certify the 757 > and 767 without such systems. No "waiver" was necessary. Both airplanes, at the time that they were introduced, met all of the applicable FARs for engine-out performance during approach climbs and landing climbs at all weights up to max take-off. Mike Lechnar Aircraft Performance Engineer "If I was speaking for Boeing, I wouldn't be doing it here."