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Atlas Air B747 > Flaps > Flashcards

Flaps Flashcards

1
Q

How many flap control units are there (FCUs)?

A

3

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2
Q

Basic function of FCUs?

A
  • Primary Control
  • Secondary Control
  • Indication/Annunciation
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3
Q

How many groups of leading edge flaps and power?

A
  • Three on each wing.

- Pneumatically, via bleed air duct

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4
Q

How are trailing edge flaps powered?

A

HYD SYS 1 and 4

4_1 || 1_4

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5
Q

How are opposite trailing edge flaps connected?

A

Mechanically, prevents asymmetry

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6
Q

In primary mode, what protection features are provided by FCUs for trailing edge flaps?

A
  • Asymmetry
  • Load Relief
  • Position Info
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7
Q

What protection features are lost in secondary mode?

A

Load Relief

  • Asymmetry protection still available via FCUs.
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8
Q

Why does FCU switch to secondary mode and how do flaps function while in it?

How are flaps commanded to extend/retract ins secondary mode?

A

If any group fails in primary mode, the FCUs switch to secondary mode for the related group, driving the group through electric motors.

Still commanded with the Flap Lever.

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9
Q

What happens if primary control failure occurs in either inboard or mid-span LEF group?

A

Both groups switch to secondary mode.

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10
Q

What happens if failure occurs in LEF group on one wing?

A
  • The flap groups on both wings change to secondary after a short delay of 20-45 seconds
  • In that time, the non-affected side completes movement via primary mode, then changes to secondary
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11
Q

What happens if TEF asymmetry is detected?

A
  • Primary mode shut down for asymmetric group
  • FCUs do not use secondary mode
  • FLAP DRIVE on EICAS
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12
Q

What EICAS message is displayed if all 3 FCUs fail?

A

FLAPS CONTROL

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13
Q

How does Flap Alternate Control mode work?

A
  • Bypasses FCUs
  • Can be manually selected
  • All flaps extended/retracted electrically
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14
Q

Is there asymmetry protection in alternate flap mode?

A

NO

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15
Q

What happens when ALTN flaps arm switch is pushed?

A
  • Arms flaps alternate control mode
  • Arms alternate flaps selector
  • Shuts off primary/secondary mode
  • Flap Lever Inop
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16
Q

What is max flap extension in alternate mode?

A

25

17
Q

LEF white box outline?

A

Retracted

18
Q

LEF white crosshatch?

A

In transit

19
Q

LEF solid green box?

A

Extended

20
Q

LEF amber box outline, crosshatch, or solid box?

A

Drive unit inop

21
Q

What does amber “X” mean on expanded flap display?

A

Position sensor inop

22
Q

Describe Alternate Mode Expanded Flap Position Indicator?

A

Flap position index marks between 5 and 25

23
Q

What happens to flap position indicator if standby bus is the only powered AC bus?

A
  • Left wing TEF sensors not powered.

- Amber X on left outboard/inboard TEF

24
Q

What flaps extend when lever moved from UP to 1?

A

LEF, inboard and mid only

25
Q

What flaps extend when lever moved from 1 to 5?

A

LEF, outboard

TEF

26
Q

Is flap load relief available in secondary or alternate mode?

A

NO

27
Q

How long does flap indication on EICAS remain displayed after all FLAPS UP?

A

10 seconds

28
Q

What does flap system do during reverse thrust operation?

A

Inboard and mid-span LEF retract automatically

29
Q

ALTN Flaps Selector to EXT?

A
  • LEF and TEF extend electrically

- Max extension is Flaps 25

30
Q

ALTN Flaps Selector RET?

A
  • TEF and LEF flaps retract electrically
31
Q

EICAS FLAPS CONTROL?

A
  • All 3 FCUs have failed - or-

- Alternate flaps ARM switch in ALTN

32
Q

EICAS FLAPS DRIVE?

A

One or more flap groups have failed to drive in secondary mode or an asymmetry condition is detected.

33
Q

EICAS FLAPS PRIMARY?

A

One or more flap groups operating in secondary mode.

34
Q

How does Flap Load Relief work?

A

If airspeed limit is exceeded for FLAPS 30, they are retracted to 25. If airspeed is still excessive, they are further retracted to FLAPS 20.

Similarly, if FLAPS 25 speed is exceeded, they retract to FLAPS 20.

35
Q

Where are the mechanical flap gates?

A 
FLAPS 1 (LEF Inadvertent Retraction)
FLAPS 20 (Go Around)
36
Q

Secondary flap extension from FLAPS 1 to FLAPS 5 takes approx how long?

A

4 minutes

Atlas Air B747 (24 decks)

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