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Call of the Heavies > Flight Controls System > Flashcards

Flight Controls System Flashcards

1
Q

How many elevator control panels?

A

4 total. 2 per side

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2
Q

How are all flight controls powered?

A

Hydraulically

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3
Q

Is there any manual reversion for the flight controls?

A

No

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4
Q

If there is an elevator control jam, what is the mechanism to regain control?

A

Shear out by manual force

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5
Q

Describe the way that the elevator control panels are operated

A

Control column input -> hydraulic actuator -> inboard elevators-> outboard elevators. The inboard elevators move the outboard elevators

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6
Q

What does elevator feel do?

A

It provides feedback feel to the pilot based on airspeed. Faster=more force required.

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7
Q

What powers elevator feel? What is the backup>

A

Hydraulic system 2 and 3. Backup is springs

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8
Q

What elevators are displayed on the secondary EICAS for flight control position?

A

The outboard elevators

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9
Q

What powers stabilizer trim?

A

Hydraulic system 2 and 3

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10
Q

What happens if you move a yoke stabilizer trim switch with the autopilot engaged? What if you move the alternate trim switch with AP engaged?

A

1 autopilot engaged: Disconnects the autopilot

More than 1 AP engaged: Trim switch inhibited

Movement of the alternate trim: Regardless of how many autopilots engaged, it will trim the plane and not disconnect the AP, but it will give you an EICAS STAB TRIM UNSCHD

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11
Q

What is an STCM? How many are there?

A

Stabilizer Trim Control Module

2 of them

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12
Q

If you have only 1 STCM, will the stabilizer trim still work?

A

Yes, but at half rate

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13
Q

The STAB TRIM CUTOUT switches have 3 positions. ON, AUTO, and CUTOUT. What do these switches do?

A

AUTO: Hydraulic power is supplied to the STCMs. If unscheduled trim is detected, it will cutout hydraulic power
ON: Hydraulic power always supplied to STCMs
OFF: Hydraulic power removed from STCMs

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14
Q

Comparing the trim range of the regular yoke stab trim switches versus the alternate stab trim switches, which one provides a greater range of movement?

A

The alternate stabilizer trim switches

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15
Q

The rate of stabilizer trim movement is a function of____

A

Airspeed. Faster speed = slower stabilizer movement

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16
Q

How many takeoff trim ranges?

A
  1. Nose down, mid, and nose up bands
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17
Q

What determines the stabilizer trim setting for takeoff?

A

The FMC calculates it based on gross weight, CG, and takeoff thrust

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18
Q

You see an EICAS >STAB GREENBAND. What does this mean?

A

It means the nose wheel pressure sensor is saying it thinks you didn’t get the correct takeoff stab trim settings based on the weight. Recheck the data

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19
Q

Does the aircraft trim itself while hand flying?

A

Yes, it does with stabilizer trim. It’s called speed and mach stability trim. Function of airspeed

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20
Q

How many ailerons on the plane? What are they called (grouping)?

A

4 total ailerons- 2 on each wing

Divided into 2 groups “inboard” and “outboard”

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21
Q

What is aileron lockout? When does it occur?

A

It prevents overcontrolling at high airspeed. It locks out the outboard ailerons at 238 knots. Unlocks below 238 knots for full control authority

22
Q

How many total spoiler panels per wing?

A

6 total per wing

23
Q

Of the 6 total spoilers per wing, which are used in flight as speedbrakes? For roll?

A

Roll: All except furthest inboard

Speedbrakes: All except 2 outboard

24
Q

What can you do if there is a roll control jam?

A

Higher than normal force can be used to operate on-side ailerons and half the spoilers. This is allowed by use of a jam override mechanism.

If that fails, a shearout will regain control

25
Q

Why is it forbidden to trim the ailerons when the autopilot is engaged?

A

Because there is no mechanism to prevent it. The yoke will build up pressure and when you disengage the AP, it will snap to the neutral position

26
Q

Why does the EICAS only show the left spoiler panel move in flight and not the right side when using speed brakes?

A

Because the right side is showing the position of the outboard spoiler, which isnt used as a speedbrake

27
Q

What are the takeoff flap settings? What are the landing settings?

A

Takeoff: 10 or 20

Landing: 25 or 30

28
Q

How many sections of the LE flaps are there?

A
  1. Inboard, mid, outboard
29
Q

How are the LE flaps powered?

A

Normal: Pneumatically

Backup: Electric motor (slow rate)

30
Q

How many sections of TE flaps are there?

A
  1. Inboard and outboard
31
Q

What powers the TE flaps?

A

Hydraulic system 1 and 4.

1 is inboard, 2 is outboard

Backup: Electric motor (slow rate)

32
Q

What happens when you go from flaps UP to flaps 1?

A

Inboard and mid LE flaps extend

33
Q

What happens when you go from flaps 1 to 5?

A

Outboard LE extends (to join mid and inboard), and TE moves to flaps 5

34
Q

How many flap control modes are there? What are they?

A

3 modes:
-Primary: FCUs (flap control units) control the LE flaps pneumatically and TE hydraulically
-Secondary: FCUs use electric motors (activates automatically)
-Alternate: Bypasses FCSs and gives you direct authority to operate the flaps via the ALTN FLAPS switch

35
Q

What is an FCU? How many?

A

Flap control unit. 3

36
Q

What protections are available for flap primary mode? In secondary mode? In alternate mode?

A

Primary:
-Asymmetry protection (TE)
-Load relief (30 to 25 or 25 to 20)

Secondary:
-Asymmetry protection (TE)

ALTERNATE: No protections

37
Q

In alternate flap mode, does the flap lever work? What is the max flap setting?

A

No ; max is flaps 25

38
Q

If the standby bus is the only powered AC bus, can you get TE flap position info?

A

No, it will be an amber X on the flap display

39
Q

When do the LE flaps retract automatically?

A

When reverse thrust is deployed (inboard and mid)

40
Q

When would the ground spoilers deploy if they are armed?

A

-Main gear touchdown and,
-Thrust lever 1 + 3 near idle

41
Q

If you forget to arm the ground spoilers, will they still activate on landing?

A

Yes, it just now requires everything that it normally does, PLUS the reverse thrust levers on engine 2 and 4 are pulled up to idle reverse or more.

42
Q

Regarding the ground spoilers, what activated go around protection?

A

If thrust lever 1 or 3 is advanced past idle, they stow

43
Q

How many rudders are there?

A
  1. Upper and Lower
44
Q

What if the rudder pedals jam?

A

Shearouts allow you to break through with significant manual force

45
Q

If you lost 1 hydraulic system, would both rudders work?

A

Yes.

And any 2 or 3 failures will cause it to work on only 1 rudder, but it would be flyable

46
Q

What is a feel and trim unit?

A

For the rudders, to give them realistic feel. Gets harder at higher airspeeds.

It also trims the rudders and repositions the neutral point

47
Q

What is a rudder ratio changer? How many are there?

A

It protects the vertical structure by limiting the rudder displacement at higher speeds. (Not 100% guaranteed to protect the tail)

There are 2 of them (upper and lower)

48
Q

What happens if the rudder ratio changer fails?

A

The rudder stays in the position that it was when the ratio changer failed.

49
Q

How many yaw dampers?

A

2

50
Q

What powers the yaw dampers?

A

Hydraulic system 2 (lower rudder)

Hydraulic system 3 (upper rudder)

Call of the Heavies (39 decks)

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