Abormal flaps

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  • Publicado : 29 de enero de 2012
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Applicable to: ALL

CAUSES Abnormal operation of the flaps and/orslats may be due to one of the following problems: • Double SFCC failure • Double hydraulic failure (B+G or Y+G) • Flaps/Slats jammed (operation of the WTB) CONSEQUENCES Abnormal operation of the flapsand slats has significant consequences since: • The control laws may change • The selected speed must be used • A stabilized approach should be preferred • The approach attitudes change • Approachspeeds and landing distances increase • The go-around procedure may have to be modified. Note: The FMS predictions do not take into account the slat or flap failures. Since fuel consumption is increased,these predictions are not valid.

FAILURE AT TAKEOFF Should a flap/slat retraction problem occur at takeoff, the crew will PULL the speed knob for selected speed to stop the acceleration and avoidexceeding VFE. The overspeed warning is computed according to the actual slats/flaps position. The landing distance available at the departure airport and the aircraft gross weight will determine thecrew's next course of action. FAILURE DURING THE APPROACH The detection of a slat or flap failure occurs with the selection of flap lever during the approach. With A/THR operative, the managed speedtarget will become the next manoeuvring characteristic speed e.g. S speed when selecting flap lever to 1. At this stage, if a slat or flap failure occurs, the crew will: • Pull the speed knob forselected speed to avoid further deceleration • Delay the approach to complete the ECAM procedure • Refer to LANDING WITH FLAPS OR SLATS JAMMED paper check list. • Update the approach briefing In the QRH,the line, "SPEED SEL............VFE NEXT -5 kt" is designed to allow the crew to configure the aircraft for landing whilst controlling the speed in a safe manner. This procedure may involve reducing...