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ATLAS B744 > FLAP SYSTEM > Flashcards

FLAP SYSTEM Flashcards

1
Q

How many Flap Control Units (FCUs) are provided?

A

• Three

FCOM, VOL 2; 9.20.13

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2
Q

What are the basic functions of the FCUs?

A
  • Primary control
  • Secondary control
  • Indication and annunciationFCOM, VOL 2; 9.20.13
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3
Q

How many groups of leading flaps are provided, and how are they normally powered?

A
  • Three groups on each wing: outboard, midspan, and inboard section.
  • Normally pneumatically powered from the bleed air duct of your respective side.FCOM, VOL 2; 9.20.13
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4
Q

What are the two groups of trailing edge flaps, and how are they powered?

A

• Inboard and outboard
• Inboard powered by hydraulic system 1 and outboard by
system 4

FCOM, VOL 2; 9.20.13

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5
Q

How are opposite trailing edge flaps connected?

A

• Mechanically, in order to maintain symmetry.

FCOM, VOL 2; 9.20.13

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6
Q

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

A
  • Asymmetry protection,
  • Disagree and uncommanded motion,
  • Flap load relief for flaps 25 and 30, and
  • Flap position information to EICAS and other systemsFCOM, VOL 2; 9.20.13
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7
Q

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

A
  • Asymmetry protection,
  • Disagree and uncommanded motion,
  • Flap position information to EICAS and other systems.FCOM, VOL 2; 9.20.13
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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.FCOM, VOL 2; 9.20.13
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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.
- the change is for symmetrical flap groups on both wings.

FCOM, VOL 2; 9.20.14

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10
Q

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

A

• Both groups switch to secondary mode.

FCOM, VOL 2; 9.20.14

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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 secondary mode after a time delay.
• The non-affected side completes movement before changing to secondary
mode, due to the rapid rate of primary mode flap movement.

FCOM, VOL 2; 9.20.14

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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 CONTROL EICAS Caution Message If all three FCU’s fail.

FCOM, VOL 2; 9.20.13

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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.

FCOM, VOL 2; 9.20.13/ 9.30.1

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14
Q

How does the Flap Alternate Control mode work?

A

• Bypasses the FCU’s, so no protection is provided.
• Is manually selected
• All flaps are extended or retracted by electric motors.
• Flap selector is inoperative.
• After arming the alternate mode, extension and retraction is
accomplished with the Alternate flaps selector.

FCOM, VOL 2; 9.20.14

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15
Q

Is there any asymmetry protection in alternate flap mode?

A

• No

FCOM, VOL 2; 9.20.14

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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,
  • Asymmetry protection is not available.
  • Flap lever inoperative.FCOM, VOL 2; 9.10.8
17
Q

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

A

• 25

FCOM, VOL 2; 9.10.8

18
Q

Describe the secondary mode or non-normal expanded flap position indication for leading edge flaps?

A
  • All flap positions are displayed
  • White box outline shows LEF group retracted
  • White crosshatch shows LEF group in transit
  • Solid green box shows LEF group extended
  • Amber boarder - Drive unit inoperative with flap group retracted.
  • Amber solid box – Drive unit inoperative with flap group extended.
  • Amber cross hatch- Drive unit inoperative with flap group partially extended.FCOM, VOL 2; 9.10.11
19
Q

Describe the secondary mode or non-normal expanded flap position Indication for trailing edge flaps?

A
  • White – position of inboard and outboard TEF
  • Amber – asymmetry or drive failure in related groupFCOM, VOL 2; 9.10.11
20
Q

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

A

• Position sensor for respective flap has failed.

FCOM, VOL 2; 9.10.11

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.FCOM, VOL 2; 9.10.12
22
Q

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

FCOM VOL 2 9.20.15

23
Q

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

A

• Inboard and midspan leading edge flap groups.

FCOM, VOL 2; 9.20.14

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 position.
  • Outboard leading edge flap groups extend.

FCOM, VOL 2; 9.20.15

25
Q

What flap sequencing occurs when using alternate flaps?

A

• During extension, all LEF and TEF groups extend immediately.
• TEF extend to a maximum of 25.
• During retraction, all LEF groups retract after inboard TEF are
completely retracted.

FCOM, VOL 2; 9.20.15

26
Q

Describe flap load relief?

A

• Protect s the flaps from excessive air loads if airspeed limits are
exceeded with flaps 25 or 30 selected.
• If airspeed limit is exceeded , the flaps will retract to 25 or 20 to eliminate
the exceedance.
• Flaps extend once airspeed is sufficiently reduced.
- Flap load relief is not available in secondary or alternate mode.

FCOM, VOL 2; 9.20.13

27
Q

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

A

• 10 seconds

FCOM, VOL 2; 9.20.15

28
Q

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

A

• Inboard and midspan leading edge flaps retract automatically
- Flap position indicator changes to reflect flaps in transit.

FCOM, VOL 2; 9.20.15

ATLAS B744 (21 decks)

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