Originally Posted by
pineteam
Hi Vilas,
Care to explain please?
Why with the lever position between flaps 3 and Full will change the gain control if the flaps or slats are stuck?
Thanks.
My apologies I got mixed up. The control laws act according to actual slat and flap position. There was a runway overrun in Hongkong of Dragon air A320 VR-HYU on 6Junv1994. In it's report it explains everything. There was already an OEB in existence but crew didn't know it. After this accident the ECAM was modified. To quote from it:
The lateral control laws applied by the flight control computers correspond to the actual positions of the slats and flaps (para 1.6.4). During the event, the gains and kinematics corresponding to the Config FULL were not selected due to the fact that the slats were retracted.3.1.20 In this incident, flaps were locked at Config FULL (40°) while the FLAPS lever was set at Config 3 for the second approach, Config 1 for the third and Config 3 for the fourth approach (paras 2.4.6 and 2.4.7). The lateral control law was not optimised in these configurations and was liable to generate, in turbulent conditions, lateral oscillations when the autopilot was engaged and to increase the lateral sensitivity in roll when the aircraft was being manually flown.