SLATS AND FLAPS

34 important questions on SLATS AND FLAPS

When do the F and S legends and position indications appear amber?

The F and S legends and position indications appear amber if both associated hydraulic systems are not pressurized, or the wingtip brakes are on, or there is a fault in the Slats or Flaps.

What appears at possible slat and flap positions for all configuration selections except FLAP 0?

White indexes appear at possible slat and flap positions for all configuration selections except FLAP 0.

What inhibits the amber FLAP legend color?

The amber FLAP legend color is inhibited when hydraulic systems are not pressurized on the ground with the engines stopped.
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How many selectable detents does the FLAPS Lever have?

The FLAPS Lever has 5 selectable detents; 0, 1, 2, 3, and FULL.

What do the blue symbols indicate?

The blue symbols indicate the selected position of the associated flap or slat.

What do Pressure-Off Brakes (POBs) do when the slat or flap surfaces have reached the commanded position or when hydraulic power fails?

The systems are equipped with Pressure-Off Brakes (POBs) that lock the gearbox when the slat or flap surfaces have either reached the commanded position or when hydraulic power fails.

When will the Alpha/Speed Lock function not activate?

The Alpha/Speed Lock function will not activate if:
  • the high alpha or low airspeed conditions are reached after the pilot has selected the FLAPS Lever to 0, or;
  • the aircraft is on the ground with speed less than 60 kts.

What happens when the flaps or slats are in transit?

While the flaps or slats are in transit, a blue symbol appears, and the Lever position displays blue.

What happens to the blue symbols and Lever position when the selected position is reached?

The blue symbols blank and the Lever position changes from blue to green when the selected position is reached.

What is shown on Page 23 regarding E/WD Failure Titles?

On this page we show the flap and slat related E/WD Failure titles and the associated conditions.

How does the flap disconnect detection system prevent further damage?

A flap disconnect detection system can detect attachment failure and if there is a failure will inhibit flap operation in order to prevent further damage.

What must a pilot do at Lever positions 1 and 3 to select the next detent?

The Balks at Lever positions 1 and 3 require that the pilot momentarily release the detent unlock before selecting the next detent - extending or retracting.

What does the Slat/Flap Chart show?

This chart shows the configurations of the Slats and Flaps as related to the FLAPS 0 and 1 Lever detents.

How are the Slats and Flaps controlled and operated?

The Slats and Flaps are electrically controlled and hydraulically operated.

What does a sensor do in the flap disconnect detection system?

A sensor detects an attachment failure by measuring excessive differential movement between the Inner and the Outer Flaps.

What happens when FLAPS 0 is selected and the Slats and Flaps Surfaces are retracted?

When FLAPS 0 is selected and the Slats and Flaps Surfaces are retracted the E/WD appears as shown.

What is the result when FLAPS 1 is selected?

When FLAPS 1 is selected, the result will be either CONF 1 (slats extend only) or CONF 1+F (slats and flaps extend) as described above.

Where is the Lever position displayed?

The Lever position is displayed on the E/WD.

What conditions cause Wingtip Brakes (WTBs) to stop the operation of Slats and Flaps?

These conditions include asymmetry, mechanism overspeed, symmetrical runaway, or uncommanded movement.

What are CONF 0 and CONF 1 designated for?

Note that CONF 0 and CONF 1 are designated holding configurations, but CONF 1+F is not for holding.

What drives the Slats and Flaps?

The Slats and Flaps are each driven by a Power Control Unit (PCU) that consists of two independent hydraulic motors coupled by a differential gearbox.

What happens when a Wingtip Brake (WTB) is activated?

When a WTB is activated, the associated slat or flap cannot be operated for the remainder of the flight.

What happens with the selection of FLAPS 1 on the ground?

The selection of FLAPS 1 will result in slat extension only (CONF 1) or in slat and flap extension (CONF 1+F) depending on conditions shown in the diagram.

What is the function of the Alpha/Speed Lock in relation to slat retraction?

The Alpha/Speed Lock function inhibits slat retraction at high angles of attack or low airspeeds.

What information do the SFCCs use to activate the Alpha/Speed Lock inhibit feature?

The SFCCs use corrected angle of attack (á or alpha) or airspeed information from the ADIRUs to activate the inhibit feature.

What is the result of selecting FLAPS 1 from FLAPS 2 in the same speed range?

Selecting FLAPS 1 from FLAPS 2 in this same speed range will result in CONF 1+F.

How many Slat Flap Control Computers (SFCCs) are there?

There are two Slat Flap Control Computers (SFCCs) that each have one slat channel and one flap channel.

Under what conditions will the Alpha/Speed Lock function inhibit slat retraction?

The Alpha/Speed Lock function will inhibit slat retraction if FLAPS 0 is selected when á is greater than + 8.6° or the airspeed is less than 148 kts.

What happens during a CONF 2/3 Takeoff when FLAPS 1 is selected?

During a CONF 2/3 Takeoff (or even Go-Around), when FLAPS 1 is selected with the airspeed above 100 kts and below 210 kts, the result will be CONF 1+F.

What happens if one SFCC is inoperative?

If one SFCC is inoperative, the Slats and Flaps operate at half speed.

When is the inhibit feature removed in the Alpha/Speed Lock function?

The inhibit feature is removed when á decreases to less than +7.6° or when the airspeed increases to greater than 154 kts.

What do Asymmetry Position Pick-off Units (APPUs) measure?

Asymmetry Position Pick-off Units (APPUs) measure asymmetry between the left and right wings and provide that information to the SFCCs.

What information do Feedback Position Pick-off Units (FPPUs) provide?

Feedback Position Pick-off Units (FPPUs) provide position feedback information to the SFCC.

What does an Indication Position Pick-off Unit (IPPU) send?

An Indication Position Pick-off Unit (IPPU) sends the position information to the ECAM.

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