Airbus and the WTB
If the Wing Tip Brakes WTB are engaged in flight it means that the SFCC 1/2 has detected a difference in flap or slat torque drive shaft asymmetry i.e. that the amount of turns input into the flap or slat drive shaft by the Flap/Slat PDU at the inboard end of the shaft has not been replicated at the wingtip. (Asymmetry, Runaway or shaft over speed) Therefore if the WTB are engaged it is probably due to a detected shaft shear in the flap or slat drive system
The WTB will hold the outboard end of the drive shaft to prevent the remaining slats or flaps being driven by air loads to prevent asymmetrical lift.
With this in mind,
The question I ask. Does the book say do an autoland with a WTB message and do you want with this kind of defect?
n.b. Please do not say WTB can come on during flight by changing the clock.
As Max Angle says if the weather is Sh**e you have no choice
Last edited by Bolty McBolt; 12th Apr 2011 at 01:36.
Reason: Max Angle answered my question