Flight Controls System [Question Bank Airbus A320] – Page 4

61. What does FAULT light on ELAC1(2) pushbutton indicate?

Fault light comes on amber when failure is detected and also during ELAC power up test (eight seconds)
ELAC power-up test occurs when electrical power is turned on or after occurrence of an electrical transient lasting longer than 25ms.

62. Can rudder be moved with both FACs inoperative?


63.  What are the functions of FAC computer?

FAC performs the following functions:

  • Yaw Function: yaw damping and turn coordination, rudder trim, rudder travel limitation
  • Flight Envelope Function: PFD speed scale management & alpha floor protection
  • Low energy warning function
  • Windshear  detection function

64. In case of Yellow + Blue Hydraulic system failure, aircraft remains in Normal Law. Is this statement correct?


65. What is the indication of dual elevator failure?

Following indications are triggered in case of dual elevator failure:


66. When does “PITCH TRIM” indication become amber on F/CTL page?

It becomes amber if pitch trim jams

67. What is Alpha/Speed Lock Function (SLATS)?

Alpha/Speed Lock Function inhibits slats retraction at high angle of attack and low speeds. SFCCs use corrected angle of attack or airspeed information from ADIRUs to inhibit slat retraction.

When FLAPS lever is set to 0, slats alpha/speed lock function activates and inhibits slats retraction, if:

  • angle of attack is above 8.5 degree or
  • speed is less than 148 kt
    Note: if FLAPS lever is already set to 0, when either of the above conditions occurs, the function will not activate therefore the slats will continue to retract or will remain at 0.

Once slats alpha/speed lock function is active, the slats retract to 0 when:

  • angle of attack is less than 7.6 degree
  • speed is above 154 kt