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ERJ175 systems > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

All flight controls. except the ailerons, are controlled how?

A

Electronically using fly-by-wire technology.

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2
Q

How are the Ailerons controlled?

A

Conventional control cables, and hydro-mechanical actuators.

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3
Q

Which flight controls are Hydraulically Actuated?

A
  • Primary flight controls
  • Multi function spoilers
  • Ground Spoilers
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4
Q

Which flight controls are Electrically Actuated

A
  • Horizontal stabilizer
  • Flaps
  • Slats
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5
Q

What components make up the fly-by-wire system?

A
  • Pilot interface (yoke, flaps / slat handle)
  • Actuator control electronics (ACE) units
  • Flight control modules (FCM) computers
  • Flight control surface
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6
Q

What is the function of an ACE (actuator control electronic)?

A

ACE units take the pilot control column inputs and translate that to the respective control surface.

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7
Q

How many ACE units does the ERJ-175 have?

A

9 total

  • 3 Primary ACE (P-ACE)
  • 2 Slat / Flap ACE (SF-ACE)
  • 1 Horizontal Stabilizer ACE (HS-ACE)
  • 3 Spoiler ACE (S-ACE)
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8
Q

What is the function of the P-ACE units?

A

They provide redundancy for the elevator and rudder.

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9
Q

What is the function of the SF-ACE units?

A

They provide additional power to the Slat / Flaps (Think “LO RATE”

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10
Q

What is the function of the S-ACE units?

A

They provide redundancy to all multi function and ground spoilers.

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11
Q

Normal Mode allows what high level functions? (8)

A
  • AOA limiting with elevator offset.
  • Elevator control law scheduling with elevator.
  • Auto-thrust compensation with elevator
  • Rudder airspeed gain scheduling and stroke limiting
  • Yaw damper and turn coordination via AFCS
  • Rudder flight authority
  • Roll spoiler scheduling with airspeed and speed brake deployment.
  • Configuration change compensation with horizontal stabilizers due to speed brakes actuation.
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12
Q

How is DIRECT MODE achieved?

A

By pressing the corresponding flight controls mode guarded button. (located between the MCDU’s

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13
Q

What is lost in Direct Mode?

A
  • FCM’s no longer translate pilot input to control surfaces.
  • Flight controls have the same sensitivity regardless of airspeed.
  • High level functions are no longer available.
  • Loss of AOA limiting
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14
Q

The rudder, elevator and stabilizer have how many controlling channels?

A

2 each

  • Rudder : Upper and Lower
  • Left elevator: Inboard and outboard
  • Right elevator: inboard and outboard.
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15
Q

How does the flight control system determine which channel is active?

A

It alternates even and odd days.

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16
Q

Electric P-BIT

A
  • Provides detection of out of tolerance conditions and failures in the FCM’s, P-ACE’s, and SF-ACE’s.
  • Begins when AC power is 1st established.
  • Last for 3 minutes
  • 3 things can interrupt:
  • -Interrupting AC power
  • -Cycling a flight control mode button
  • -Pressureizing any hydraulic system
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17
Q

What does the elevator system consist of?

A
  • 2 Independent, interconnected elevator sections (left & right)
  • 4 PCU’s
  • 2 P-ACE’s
  • 2 Independent, interconnected control columns
  • 2 Independent artificial feel units
  • 1 Elevator control column disconnect handle
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18
Q

ELEVATOR:

What is the purpose of the 4 FCM’s?

A

To provide high level function inputs to the ACE’s which include:

  • Elevator control laws scheduling with airspeed (less deflection at higher airspeeds)
  • Auto thrust compensation
  • AOA limiting with elevator offset
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19
Q

Which hydraulic systems provide power to the elevator

A

All 3

  • System 1 powers left outboard PCU
  • System 2 powers both inboard PCU’s
  • System 3 powers Right Outboard PCU
20
Q

RUDDER:

What does the rudder system consist of?

A
  • 1 Rudder surface
  • 2 PCU’s
  • P-ACE modules
  • 2 Sets of adjustable rudder pedals
21
Q

RUDDER:

Which PCU, and which hydraulic system powers the Captains pedals?

A

The Upper PCU and Hydraulic system 1

22
Q

RUDDER:

Which PCU and which hydraulic system powers the F.O.’s pedals?

A

Lower PCU and Hydraulic system 3

23
Q

RUDDER:

What high level functions does the FCM provide?

A
  • Yaw dampener
  • Turn coordinator
  • Gain scheduling as a function of airspeed (more deflection at lower airspeed)
24
Q 
RUDDER:
In direct mode all high level functions are lost. How does the P-ACE module determine high speed or low speed gains?
A

Its determined by flap configuration:

  • Slat / Flaps up - Less rudder deflection
  • Slat / Flaps 1 or greater- more rudder deflection allowing the pilot maximum rudder authority
25
Q

AILERONS:

How are the ailerons controlled?

A

They use Cables and pulleys that control hydraulic PCU’s attached to the ailerons.

26
Q

AILERONS:

How many PCU’s do the ailerons have? What powers them?

A

Each aileron has 2 PCU’s.

  • Left and Right inboard PCU’s use hydraulic system 2
  • Left and right outboard PCU’s use hydraulic system 3.
27
Q

AILERONS:

IF the control wheel becomes jammed and must be disconnected, What does the Captain and F.O. command?

A

If the right aileron jams:
- The captain commands the left aileron and multi-function spoiler pair #5.

If the left aileron jams:
The F.O. commands the right aileron and multi-function spoiler pair #4.

28
Q

HORIZONTAL STABILIZER:

What is the purpose of the horizontal stabilizer?

A

To control forces required on the elevator

29
Q

HORIZONTAL STABILIZER:

Stabilizer trim can be accomplished ___________ or through the _______.

A

Manually

FCM

30
Q

HORIZONTAL STABILIZER:

Trim priority logic?

A
  • Backup Switches (Lower Pedestal)
  • Captain control wheel
  • First Officer control wheel
  • FCM (auto-trim) commands
31
Q

HORIZONTAL STABILIZER:

Pressing both sides of the trim switch for more than ____ seconds, stops moving the surface and trim is heard.

A

3 Seconds

32
Q

HORIZONTAL STABILIZER:
IF half of the trim switch is pressed down for more than ____ seconds that switch is _______ and the aural “TRIM” is heard. Only MX can reset.

A

7

Disabled

33
Q

HORIZONTAL STABIIZER:

Pitch trim runaway memory item

A
  • A/P DISC BUTTON….PRESS AND HOLD
  • Pitch trim sys 1 & 2 cutout buttons…. PUSH IN. (Center Pedestal)
    Then QRC, Then QRH
34
Q

What is the purpose of the SLATs / FLAPs?

A

To increase lift for takeoff and landing.

35
Q

____ slat surfaces (___ per wing), and ____ doubled slotted flap surfaces (___ per wing)

A

8, 4

4, 2

36
Q

SLAT / FLAP:

Normal takeoff flap positions?

A

1, 2, & 4

37
Q

SLAT / FLAP

Normal landing positions

A

5, Full

38
Q

SPOILERS:

What purposes do they serve?

A
  • Roll control
  • Speed Brakes
  • Ground spoilers
39
Q

SPOILERS:

How are: Roll control, Speed Brakes and Ground spoilers actuated?

A
  • The FCM automatically commands the spoilers for roll control and ground spoilers.
  • The pilot manually actuates the spoilers using the speed brake handle.
40
Q

SPOILERS:

How many spoilers on the ERJ-175

A

5 on the upper surface of each wing.

41
Q

SPOILERS:

What do each of the spoilers do?

A
  • The 2 inboard panels are dedicated ground spoilers.

- The 3 outboard spoilers are multi-function spoilers and can be used for all spoiler functions.

42
Q

SPOILERS:

How are the spoilers numbered

A

Starting inboard and moving outboard.

43
Q

SPOILERS:

Hydraulic systems 1 and 2 are used to actuate which spoilers?

A
  • Hydraulic system 1 actuates spoiler pairs 2, 3, and 4.

- Hydraulic system 2 actuates spoiler pairs 1 and 5.

44
Q

SPOILERS:

In order for ground spoilers to activate what must occur simultaneously?

A
  • Weight on wheels
  • Wheel speed > 45 KIAS or airspeed > 60 KIAS
  • Thrust Lever Angle (TLA)
45
Q

SPOILERS:

Are ground spoilers available in Direct Mode?

A

NO

46
Q

SPOILERS:

When are speed brakes automatically commanded closed?

A
  • Flaps selected to 2 or greater.
  • Airspeed decreases below 180 KIAS
  • TLA > 70 degrees
  • Speed brakes are not available in direct mode.

ERJ175 systems (3 decks)

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