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Atlas B747 > Flap System - Question Bank > Flashcards

Flap System - Question Bank Flashcards

1
Q

How many Flap Control Units (FCUs) are provided?

A

3

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2
Q

What are the basic functions of the FCUs?

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

How many groups of leading edge flaps are provided?

How are they normally powered?

A
  • 3 groups on each wing: inboard, midspan, and outboard

- Normally pneumatically powered from the bleed air duct

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4
Q

What are the two groups of trailing edge flaps?

How are they powered?

A
  • Inboard & Outboard
  • Inboard: Hyd Sys 1
  • Outboard: Hyd Sys 4
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5
Q

How are opposite trailing edge flaps connected?

A

Mechanically in order to maintain symmetry

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6
Q

What protection features do FCUs provide for trailing edge flaps in primary mode?

A
  • Asymmetry protection
  • Flap load relief
  • Flap position information to EICAS and other systems
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7
Q

What protection features do the FCUs provide for trailing edge flaps in secondary mode?

A
  • Asymmetry protection

- Flap position information to EICAS and other systems

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8
Q

Describe the function of the FCUs in primary mode.

A
  • LEF are driven pneumatically to the selected position

- TEF are driven hydraulically to the selected position

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9
Q

Describe the function of the FCUs in secondary mode.

A
  • If any flap group fails to move to the commanded position, the FCUs switch to secondary mode for the related group
  • The flap group is driven through electric motors
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10
Q

What happens if a primary control failure occurs in either the inboard or mid-span leading edge flap group?

A

Both groups switch to secondary mode

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11
Q

What happens if a failure occurs in a leading edge flap group on one wing?

A
  • The flap groups on both wings change to the secondary mode after a short time delay
  • The non-affected side completes movement before changing to the secondary mode, due to the rapid rate of primary mode flap movement
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12
Q

What happens immediately if a trailing edge asymmetry is detected?

A
  • Primary mode is immediately shut down for the asymmetric group
  • The FCUs do not use secondary mode
  • FLAP DRIVE EICAS caution message
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13
Q

What EICAS advisory message displays if all three FCUs fail in their control function?

A

-“FLAPS CONTROL” EICAS Caution Message

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14
Q

How does the Flap Alternate Control Mode work?

A
  • Bypasses the FCUs
  • Can be manually selected
  • All flaps are extended or retracted by electric motors
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15
Q

Is there any asymmetry protection in alternate flap mode?

A

No

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16
Q

State the actions that occur when the Alternate (ALTN) Flaps Arm switch is pushed.

A
  • Arms flap alternate control mode
  • Arms Alternate Flaps selector
  • Shuts off primary and secondary mode operation
  • Flap level inoperative
17
Q

What is the maximum extension of the trailing edge flaps in alternate mode?

A

25

18
Q

Describe the secondary mode or non-normal expanded flap position indication for LE flaps.

A
  • All flap positions are displayed
  • White box outline shows LEF group retracted
  • White crosshatch shows LE group in transit
  • Solid green box shows LEF group extended
  • Amber border, crosshatch, or solid box- drive unit inop
  • Indicator motion is continuous between flap detents
19
Q

Describe the secondary mode or non-normal expanded flap position indication for TEF

A
  • White - position of inboard and outboard TEF
  • Amber - asymmetry or drive failure in related group
  • Indicator is continuous between flap detents
20
Q

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

A

Position sensor for respective flap has failed

21
Q

Describe the Alternate Mode Expanded Flap Position indicator.

A
  • All flap positions displayed
  • Flap position index marks at 5 and 25
  • Indicator motion is continuous between flap detents
22
Q

Describe the flap position indication on EICAS if the standby bus is only powered AC bus.

A
  • The left wing TEF sensors are not powered
  • An amber X is displayed on the left outboard and inboard TEF indications
  • An expanded indication is displayed
23
Q

What flaps extend when the flap level is moved from Up to Flaps 1?

A

-Inboard and midspan leading edge flap groups

24
Q

What flaps extend when the flap lever is moved from Flaps 1 to Flaps 5?

A

Trailing edge flaps move to Flaps 5

25
Q

What flap sequencing occurs when using alternate flaps?

A
  • During extension: all LEF and TEF groups extend immediately
  • TEF extend to a max of 25
  • During retraction: all LEF groups retract after inboard TEF are completely retracted
26
Q

Describe flap load relief

A

If airspeed limit is exceeded:

  • with flaps 30 selected- flaps retract to 35
  • with flaps 25 selected- flaps retract to 20

-Flap load relief is not available in secondary or alternate mode

27
Q

How long does the flap indication on primary EICAS remain displayed after all flaps are up?

A

10 secs

28
Q

What is the affect on the flap system during engine reverse thrust operation?

A

Inboard and midspan LEF retract automatically

Atlas B747 (31 decks)

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