下面哪种情况可能发生引起风向突变的低空风切变

襟翼由两个交流动力驱动组件（PDU）驱动，当其中一个失效，襟翼操作：The flaps are driven by two AC Power Drive Units (PDU) when one of them fails, flap operation:

如果襟缝翼电子控制组件（SFECU） 的一个通道失效，EICAS上会显示什么信息？What message appears on EICAS if one channel of the SFECU fails?

缝翼/襟翼控制手柄可选择的位置有哪些？What are the selectable Slats/Flaps Control Lever positions?

安定面配平的控制优先顺序是？What is the control priority of the Stabilizer Trim?

判断正误True or False:当安定面配平失控时，需选择按压红色的安定面配平断开(STAB TRIM DISC)电门。The red STAB TRIM DISC switch shall be selected if stab trim runaway happened.

判断正误True or False:飞行操纵面的所有配平都是电动的。Trimming of the flight control surfaces are all electrical.

副翼，水平安定面和方向舵配平控制在：Aileron, Horizontal Stabilizer and Rudder Trim controls are provided at:

万一出现副翼卡阻，ROLL DISC手柄拉出后，多功能扰流板（MFSs）：In case of jammed aileron, after ROLL DISC handle pulled, the MFSs:

升降舵向上或向下位置可在哪里检查：Elevator up or down position can be checked on :

什么时候遮光板上的琥珀色横滚选择电门/灯会亮？When do the Glareshield Amber Roll Select Switch/Lights illuminate?