The 400 uses a diferent logic to the "Classic" it only uses flap lever position, so after landing when the flap lever is moved towards UP the trailing edge obviously begins to retract but as soon as the flap lever is placed or passes F1 the outboard LE flap begins to retract and as soon as the flap lever is placed in the UP position the midspan and IB Krugers begin to retract, this is why the LE on a 400 looks like it retracts as one unit on the ground after landing but actually the OB section just starts a fraction earlier as the handle passes flap 1. The "Classic" on the other hand has to wait for the TE to sequence the retraction of the LE.
I hope this helps.
This is incorrect see below.
Last edited by SMOC; 24th April 2003 at 13:09.