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E175 Systems > Flight Controls > Flashcards

Flight Controls Flashcards

0
Q

What are the secondary flight controls

A
  • Horizontal stabilizer
  • flaps/slats
  • multifunction spoiler (when used as speed brakes or ground spoilers)
  • dedicated ground spoilers
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1
Q

What are the primary flight controls

A
  • Ailerons and multifunction roll spoilers
  • elevators
  • rudder
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2
Q

How are the ailerons commanded

A

Conventional control cables from the control column to the PCUs

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3
Q

Which control surfaces are fly-by-wire

A
  • elevators
  • rudders
  • roll spoilers
  • horizontal stab
  • flaps/slats
  • ground spoilers
  • speed brakes
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4
Q

What are included in the primary control electronics

A

Primary Actuator Control Electronics (P-ACE)

Flight Control Modules (FCM)

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5
Q

The FBW system is made up of how many Actuator Control Electronics

A

9

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6
Q

The FBW system is made up of how many FCMs

A

4

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7
Q

What is an FCM

A

Flight Control Module

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8
Q

What are the slat degrees available

A

0, 15, or 25

15 for lever position 1-3
25 for lever position 4-full

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9
Q

What are the slat, flap degrees for each position selected

A

0: 0, 0 deg
1: 15, 5 deg
2: 15, 10 deg
3: 15, 20 deg
4: 25, 20 deg
5: 25, 20 deg
Full: 25, 35 deg

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10
Q

What do the ACEs do

A

They connect the control column electronically to the respective control surface

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11
Q

How many P-ACEs are there and what do they control

A

3, rudder and elevator surfaces

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12
Q

How many SF-ACEs are there and what do they control

A

There are 2 SF-ACEs and they control the slats and flaps surface

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13
Q

How many channeled do the SF-ACEs have and what are they for

A

2, one for flaps, one for slats

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14
Q

How many channeled do the P-ACEs have and what are they for

A

2, one active, one standby

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15
Q

How many channeles do the HS-ACEs have and what are they for

A

2, one active, one standby

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16
Q

How many HS-ACEs are there and what do they control

A

1, it controls the horizontal stabilizer surface

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17
Q

How many S-ACEs are there and what do they control

A

3, located within the FCMs, they control the multifunction spoilers

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18
Q

What is DIRECT mode

A

The FCM is removed from the control loop and control limits default to values set by hardware in the P-ACE. Don’t roll input is sent directly from pilots to the control surface

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19
Q

What let’s the P-ACE units and FCMs communicate

A

The Controller Area Network Bus (CAN BUS)

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20
Q

How long does a Power Up Built In Test (PBIT) last before it expires

A

50 hrs (elapsed time)

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21
Q

What does the electrical PBIT look for

A

Out-of-tolerance conditions and failures in the FCMs, P-ACEs, and SF-ACEs

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22
Q

When is the electrical PBIT performed and how

A

Automatically during power up after the plane has AC power. It takes approx 3 mins.

23
Q

What must be done if the FLT CTRL BIT EXPIRED message is displayed

A

The hydraulic BIT must be performed

24
Q

When will the electrical PBIT be interrupted

A

If:

  • Any hydraulic pump is turned ON
  • if the FCP switches are cycled
  • if AC power is interrupted while test is running
25
Q

What is he hydraulic PBIT

A

It is a functional check of the flight control actuators

26
Q

When is the hydraulic PBIT performed

A

Automatically, only on the ground, when all three hydraulic systems are pressurized

27
Q

How long does the hydraulic PBIT take and when will it be interrupted

A

1 min. Interrupted if any control surface is moved.

28
Q

Under what temperature is the hydraulic PBIT not performed*

A

When temps within hydraulic reservoir are lower than 10C unless the FLT CTRL BIT EXPIRED is displayed

29
Q

How do you rerun the hydraulic PBIT if interrupted

A

All three hyd systems must be depressurized

30
Q

What backs up the fly by wire system

A

A dedicated battery will power the system for 15 mins

31
Q

What charges the FBW backup battery

A

DC ESS 3

32
Q

On the elevator, which actuator does hyd system 1 power

A

Left outboard actuator

33
Q

On the elevator, which actuator does hyd system 2 power

A

Left and right inboard actuators

34
Q

On the elevator, which actuator does hyd system 3 power

A

Right outboard actuator

35
Q

What is elevator thrust compensation

A

They system will automatically adjust pitch for a change in engine thrust

36
Q

What is the HS-ACE priority logic

A

1- backup switches
2- captain
3- FO
4- FCM (auto trim)

37
Q

What type of actuator is the HS-ACE

A

Electro mechanical

38
Q

Which HS-ACE channel is active during electrical failure

A

Channel 2

39
Q

Which PCU does hyd sys 2 control on the ailerons

A

Left and right inboard

40
Q

Which PCU does hyd sys 3 control on the ailerons

A

Left and right outboard

41
Q

Who’s side gets the aileron artificial feel input

A

Captain’s

42
Q

What is the purpose of NORMAL mode

A

The FCM will increase or decrease the control surface movement based on airspeed

43
Q

Which hyd sys powers the upper rudder actuator

A

1

44
Q

Which hyd sys powers he lower rudder actuator

A

3

45
Q

In Direct mode, what determines whether the rudder will operate in low-speed fixed gain or high-speed

A

Flaps extended or retracted

46
Q

What happens to the flaps/slats when the RAT is supplying the electrical power

A
  • They operate at half speed

- They are limited to position 3

47
Q

After touchdown, when will the FCM the multifunction spoilers and ground spoilers to deploy

A
  • weight on wheels
  • wheel speed above 45 kts or airspeed above 69 kts
  • thrust lever angle below 26 degrees
48
Q

When will ground and multi spoilers retract on rollout

A
  • When wheel speed is below 45 kts for at least 5 secs

- or if thrust levers are moved to beyond TLA of 35 degrees

49
Q

Are ground spoilers available in direct mode

A

No

50
Q

If deployed, when will speed brakes automatically retract

A

Upon selecting flaps/slats 2 or above

51
Q

Under what airspeed will the speed brakes not deploy

A

180 kts

52
Q

During a go-around or any other time in flight, when will speed brakes automatically retract

A
  • Speed below 180 kts

- thrust lever angle above 70 deg

53
Q

Are speed brakes available in Direct mode

A

No

54
Q

What are the high level functions provided in normal mode

A
  • elevator control laws scheduling with airspeed
  • auto thrust compensation with elevator
  • AOA limiting
  • rudder airspeed gain scheduling and stroke limiting
  • yaw damper and turn coordination
  • rudder flight authority
  • roll spoiler scheduling with airspeed and speed brake deployment
  • config change compensation with horiz stab due to speed brakes actuation

E175 Systems (20 decks)

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