Flight Controls -Flaps & Slats DSC 27-30 Flashcards Preview

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Flashcards in Flight Controls -Flaps & Slats DSC 27-30 Deck (31)
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1
Q

Each wing has how many flaps?

A

2

2
Q

Each wing has how many slats?

A

5

3
Q

How are the flaps and slats controlled and operated?

A

Electrically controlled

Hydraulically operated

4
Q

What are the main components of the slat/flap system?

A
  1. 2 Slat Flap Control Computers (SFCC’s)
  2. A power control unit
  3. 5 slat & 2 flap surfaces per wing
  4. An Asymmetry position pick-off unit
  5. A Flap disconnect detection system
  6. Wing Tip Brakes
  7. Feedback position pick-off units
  8. Instrumentation position pick-off unit
5
Q

How many channels do the SFCC’s have?

A

One slat channel and

One flap channel

6
Q

What does the power control unit consist of?

A

2 independent hydraulic motors coupled by a differential gearbox

7
Q

Which hydraulic systems power the slats?

A

Green and Blue

8
Q

Which hydraulic systems power the flaps?

A

Green and Yellow

9
Q

What component locks the transmission when the slat or flap surfaces have reached the selected position, or if hydraulic power fails?

A

Pressure-off brakes (POBs)

10
Q

What does the asymmetry position pick-off (APPU) measure?

A

The slat or flap asymmetry between the left and right wings

11
Q

What does the flap disconnect detection system detect?

A

Attachment failure and inhibits flap operation in order to prevent further damage

12
Q

How does the Flap Disconnect Detection system sensor detect a failure?

A

By measuring excessive differential movement between inner and outer flaps

13
Q

When are Wing Tip Brakes (WTB) activated?

A

Asymmetry
Mechanism overspeed
Symmetrical runaway
Uncommanded movement of the surfaces

14
Q

Can WTB be released in flight?

A

No

15
Q

Which hydraulic systems do the WTB use?

A

Green and Blue -Slats and Right Wing Flaps

Green and Yellow -Left wing FLaps

16
Q

If the slat WTB’s are on, can the pilot still operate the flaps?

A

Yes

And if the slat WTB’s are on the flaps are still operable

17
Q

At what speed do the slats and flaps operate if one SFCC is inoperative?

A

Half speed

18
Q

At what speed do the slats and flaps operate if one hydraulic system is inoperative?

A

Half speed

corresponding surfaces, slats or flaps

19
Q

If a take-off is carried out at heavy weight, what two protections may intervene?

A
  • Automatic Retraction System (ARS)

- Alpha Lock function

20
Q

When will the Automatic Retraction System activate?

A

When in CONF 1+F and IAS reaches 210kts

VFE CONF 1+F = 215 kts

21
Q

What happens when Automatic Retraction system activates?

A

While in CONF 1+F and IAS reaches 210kts (VFE-5kts)

Flaps automatically retract to 0.
VFE now CONF 1 (230 kts)

22
Q

What is the purpose of the Alpha/Speed Lock function?

A

Inhibits slat retraction at:

High angles of attack, and
Low speeds

At the moment the flap lever is moved from Flaps 1 to flaps 0

23
Q

What information do the SFCC’s use to inhibit slat retraction as part of the Alpha/Speed Lock function?

A

Corrected AoA or airspeed information from the ADRIU’s

24
Q

When the FLAPS lever is set to 0, the slats allpha/speed lock function will activate and inhibit slat retraction if:

A
  1. The AoA is above 8.5°, or

2. The speed is less than 148 kts

25
Q

How do you know the Alpha Lock function has activated?

A

‘A-LOCK’ pulses green (cyan-YUD) above the E/WD slat indication

26
Q

When is the Alpha Lock inhibition removed and the slats retract to 0?

A

When both Alpha and Speed fall within normal values:

AoA less than 7.6°, and

Speed above 154 kts

27
Q

Is Alpha Lock function activation a normal situation for a heavy weight take-off?

A

Yes

28
Q

What should the crew do if Alpha Lock function is activated?

A

Continue the normal acceleration, allowing further slats retraction

29
Q

The VMAX on the PFD is based on…..?

A

The Slat/Flap Control lever position

30
Q

The OVERSPEED WARNING is based on….?

A

The actual Slat/Flaps surface position

31
Q

What does amber FLAP, slat/flap position, S and F indications indicate?

A

Both relevant hydraulic systems fail

WTB are on

Slats or flaps fault