A320 Memory Items

Complete understanding of the Airbus A320 Memory Items. For training purposes only! Do not use it for flight.

WINDSHEAR

WINDSHEAR

Windshear is defined as a sudden change of wind velocity and/or direction.

Windshear may be vertical or horizontal, or a mixture of both types.

  • Vertical wind shear is defined as change of horizontal wind direction and/or speed with height, as would be determined by means of two or more anemometers mounted at different heights on a single mast.
  • Horizontal wind shear is defined as change of horizontal wind direction and/or speed with horizontal distance, as would be determined by two or more anemometers mounted at the same height along a runway.

 

WINDSHEAR DETECTION FUNCTION

The windshear detection function is provided by the Flight Augmentation Computer (FAC) in takeoff and approach phase in the following conditions:

  • At takeoff, 3 s after liftoff, up to 1 300 ft RA
  • At landing, from 1 300 ft RA to 50 ft RA
  • With at least CONF 1 selected.

The warning consists of:

‐ A visual “WINDSHEAR” red message displayed on both PFDs for a minimum of 15 s.

‐ An aural synthetic voice announcing “WINDSHEAR” three times.

 

The FACs generate the windshear warning whenever the predicted energy level for the aircraft falls below a predetermined threshold.

In computing this energy level prediction, the FAC s use data from different sources. From ADIRS comes data such as vertical speed, air and ground speeds and slope ; from other sources come such derived parameters as total slope, longitudinal wind gradient, and vertical wind.

The FACs express this energy level as an angle of attack and compare it with an angle-of-attack threshold above which windshear conditions are most likely and pilot action is required.

 

In windshear conditions, flight guidance acts on specially adapted FD pitch orders received from the speed reference system (SRS). The pilot must set go around thrust immediately (which also triggers the FD SRS mode), and follow the pitch order to execute the optimum escape maneuver.

Noise Abatement Procedures will not be conducted in conditions of significant turbulence or windshear.

 

WINDSHEAR MEMORY ITEMS

Before V1:

The takeoff should be rejected only if significant airspeed variations occur below indicated V1 and the pilot decides that there is sufficient runway remaining to stop the airplane

 

After V1:

  • THRUST LEVERS………………………………………………TOGA
  • REACHING VR………………………………………………ROTATE
  • SRS ORDERS………………………………………………. FOLLOW

 

If necessary pull the sidestick fully back.

In case the FD bars are not displayed, move toward an initial pitch attitude of 17.5 °

 

Airborne, initial climb or landing:

 

  • THR LEVERS AT TOGA……………………. SET OR CONFIRM
  • AP (if engaged)………………………………………….. KEEP ON
  • SRS ORDERS………………………………………………FOLLOW

If necessary pull the sidestick fully back.

Autopilot disengages if the angle of attack value goes above α prot.

If the FD bars are not displayed, move toward an initial pitch attitude of 17.5 °.

Then, if necessary, to prevent a loss in altitude, increase the pitch attitude.

DO NOT CHANGE CONFIGURATION (SLATS/FLAPS, GEAR) UNTIL OUT OF WINDSHEAR.

CLOSELY MONITOR FLIGHT PATH AND SPEED.

RECOVER SMOOTHLY TO NORMAL CLIMB OUT OF WINDSHEAR.

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