![]() ![]() ![]() That is, whether the flaps are arranged inboard/outboard, or simply one big set of flaps, is irrelevant when everything is working well, aerodynamically speaking. A flap section failure is less of a hazard, then, in the event of a hydraulic loss, pneumatic failure, or electrical failure (for alternate flap controls), which enhances safety.Īerodynamically, the flaps move together as a rule, and splitting flaps into inboard and outboard assemblies isn't really an issue when the flaps are working normally. This means that a failure of a particular section of flap or leading edge will have less overall effect on the airplane than if everyything moved together. Our leading edge flaps, a blend of Kreuger and variable-camber sections, extend on cues given by the different trailing edge flap sections. ![]() This happens using a signal from our outboard flap unless the outboard flap is extended beyond 1 degree, the outboard aileron will be electrically locked out. At higher speeds, with the flaps retracted (cruise), we no longer use the outboard ailerons. We have inboard and outboard ailerons, and normally in slow flight (takeoff, landing) with the flaps extended, we use both sets of ailerons for more effective control. Our inboard and outboard flaps also have different functions. This helps ensure that flaps will be less affected by the loss of a single system. Hydraulic system 1 powers the inboard flaps, while system 4 powers the outboard flaps. Our airplane also uses independent hydraulic systems to move or power various components. The change in geometry is more easily handled with two sets of flaps. The span is divided into two parts, which make a large angular change in the trailing edge of the wing. A failure of a flap unit on one wing wont' cause nearly the problems that would be caused if the entire flap failed on one side. They are very large dividing them up into an inboard and outboard section accomplishes two things. When moving by the alternate extension system, they move with electric motors. When moving normally, they do so hydraulically. I can't speak to the Hawker you mention, but in the B747 I fly we have inboard and outboard flaps which move together normally, and can be moved independently on a manual extension system. outboard flaps are a means of redundancy and control. ![]()
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