PPRuNe Forums - View Single Post - Short Field Landing Techniques
View Single Post
Old 10th Apr 2006, 07:09
  #32 (permalink)  
404 Titan
 
Join Date: May 2002
Location: Asia
Age: 56
Posts: 2,600
Received 0 Likes on 0 Posts
TheShadow

From another source I understand that Airbus at least is considering writing software in order to incorporate the technique into its automation.
Rubbish. A little understanding of the Airbus and in this case the A330/340 flight control system will tell you Airbus aren’t and won’t be considering any changes to the flight control laws. If they were it would require a recertification of the entire flight control system on these aircraft. By the way the flight control laws for all the airbus fly by wire aircraft are essentially the same including the A380.

FLARE MODE A330/340

The flight mode changes to flare mode at landing when passing 100 ft. Flare mode is a direct stick-to-elevator relationship (with some damping provided by load factor and pitch rate feedbacks). In addition, at 50 feet, a slight pitch down elevator order is applied, so that the pilot has to move the stick rearwards to maintain a constant path, so as to reproduce conventional aircraft aerodynamic characteristics.
What this little excerpt from the A330/340 FCOM is saying is that the pilot has direct and full control over the elevator below 100 feet AGL. To even contemplate taking that away is fraught with danger and in most cases if not all certifying authorities around the world would have a problem with it.

Airbus’s simple solution would be to make an amendment in the NP section of the FCOM 3 stating that the pilot flying after landing should progressively apply up to full back stick to maximise aerodynamic braking. They haven’t done this and I doubt they will ever do this as it is a very bad technique to use in such a large jet.
404 Titan is offline