par Beochien Lun 20 Jan 2014 - 15:53
Vu sur A.net et bien intéressant !
Airbus, sur le A350, s'attaque à qq incertitudes soulevées peut être par AF 447 !
Bon, c'est pour un côté de l'enveloppe ! Les questions dont on parle le plus aux USA
La protection contre l'overspeed dans ce cas !
Et pour la première foi mention, côté officiel (US) des ETOPS à 420 mn à l' EIS ! Chapeau ... zon pas peur chez Airbus !
Bien, c'est la FFA qui cause ! Vu par 4-Traders ...
http://www.4-traders.com/news/Special-Conditions-Airbus-Model-A350-900-Series-Airplane-Flight-Envelope-Protection-High-Speed-L--17769046/
Background
On August 25, 2008, Airbus applied for a type certificate for their new Model A350-900 series airplane. Later, Airbus requested and the FAA approved an extension to the application for FAA type certification to June 28, 2009. The Model A350-900 series has a conventional layout with twin wing-mounted Rolls-Royce Trent engines. It features a twin aisle 9-abreast economy class layout, and accommodates side-by-side placement of LD-3 containers in the cargo compartment. The basic Model A350-900 series configuration will accommodate 315 passengers in a standard two-class arrangement. The design cruise speed is Mach 0.85 with a Maximum Take-Off Weight of 602,000 lbs. Airbus proposes the Model A350-900 series to be certified for extended operations (ETOPS) beyond 180 minutes at entry into service for up to a 420-minute maximum diversion time.
The longitudinal control law design of the Airbus Model A350-900 incorporates an overspeed protection system in the normal mode; this would prevent the pilot from inadvertently or intentionally exceeding a speed approximately equivalent to VFC or attaining VDF. Current Title 14 Code of Federal Regulations (14 CFR) part 25 sections do not relate to a high speed limiting protection system that might preclude or modify flying qualities assessments in the overspeed region. However, the requirements of SEC 25.253 (High-speed characteristics) and its related policy are applicable to the Model A350-900 series and not affected by this proposed special condition.