SUPPLEMENTARY INFORMATION
ADVERSE WEATHER
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
If the aircraft accelerates above VMO with the AP engaged, the AP will disengage on reaching the high speed protection. The high speed protection will apply a nose-up order up to 1.75 g, in addition to pilot input during VMO recovery. Therefore, make a smooth pitch correction in order to recover proper speed.
Speedbrakes may be used in case of high speed exceedance, but the flight crew should be aware of pitch influence. In addition, speedbrakes will be used with caution, close to the ceiling. High Speed Protection may also result in activation of the angle of attack protection. Depending on the ELAC standard, the crew may have to push on the stick to get out of this protection law. In all events, check the AP engagement status, and re-engage it when appropriate. It may have tripped and the associated aural warning may have been superseded by the overspeed aural warning.
CONSIDERATIONS ON CAT
Clear Air Turbulence (CAT) can be expected by referring to weather charts and pilot reports. However, the radar cannot detect CAT, because it is "dry turbulence".
If CAT is encountered, the flight crew may consider avoiding it vertically, keeping in mind that the buffet margin reduces as the altitude increases.
MISCELLANEOUS
? The flight crew must set the harness to on, check that the seat belts signs are on and use all white lights in thunderstorms.
? Turbulence speeds are indicated in the QRH.
? It is not necessary to set the ENG START selector to IGN. In the case of an engine flameout, the igniters will trigger automatically.
WINDSHEAR
Applicable to: ALL
BACKGROUND INFORMATION WINSHEAR PHENOMENON
The windshear is mostly due to cool shaft of air, like a cylinder between 0.5 nm and 1.5 nm width that is moving downward. When the air encounters the ground:
? Mushrooms horizontally, causing horizontal wind gradient
? Curls inward at the edges, causing vertical air mass movement.
Flight safety is affected, because:
? Horizontal wind gradient significantly affects lift, causing the aircraft to descend or to reach very high AOA.
? Vertical air mass movement severely affect the aircraft flight path.
SUPPLEMENTARY INFORMATION
ADVERSE WEATHER
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
Windshear phenomenon
AWARENESS AND AVOIDANCE
Awareness of the weather conditions that cause windshear will reduce the risk of an encounter. Studying meteorological reports and listening to tower reports will help the flight crew to assess the weather conditions that are to be expected during takeoff or landing.
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