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Boeing 777 > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

When the PRIMARY FLIGHT COMPUTERS Disconnect switch is in AUTO, which flight control modes are available?

A

The flight control system operates in the normal mode, but system faults automatically cause the system to switch to the secondary or direct modes

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2
Q

Where are the aileron trim switches located?

A

On the aisle stand

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3
Q

What is the effect of operating a single aileron trim switch?

A

Nothing, both switches must be operated together

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4
Q

Where is the aileron trim position displayed?

A

On top of the control column

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5
Q

Where is the rudder trim control located?

A

On the aft aisle stand

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6
Q

What trim rates are available on the rudder trim?

A

Two, low speed to the detent, high speed when the knob is rotated past the detent

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7
Q

What rate does the MANUAL TRIM CANCEL swiych use?

A

High speed rate

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8
Q

What are the three primary control system modes?

A

Normal, Secondary and Direct

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9
Q

Name the electronic modules that convert pilot/autopilot inputs into control surface signals?

A

Actuator Control Electronics (ACEs)

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10
Q

What is the function of the Primary Flight Computers?

A

They use information from other airplane systems (air data, inertial data, flap and slat position, engine thrust and radio altitude) to compute control surface commands for enhanced handling qualities

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11
Q

How many sections comprise the rudder?

A

Two, main rudder plus hinged section on the lower portion

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12
Q

Which hydraulic system(s) power the flight controls?

A

Left, Centre and Right

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13
Q

In Normal mode what are the three flight envelope protection features?

A
  1. Stall protection
  2. Overspeed protection
  3. Bank angle protection
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14
Q

If the flight controls are operating in the Secondary mode are the primary flight control computers still being used?

A

Yes, but they use simplified computations

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15
Q

If the flight controls are operating in the Secondary mode are the envelope protection features still available?

A

No

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16
Q

If the flight controls are operating in the Secondary mode what other functions are lost?

A

Autopilots, Gust suppression, TAC, Auto speedbrakes and Yaw damping (may be degraded or inoperative)

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17
Q

Can Secondary mode be manually selected?

A

No

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18
Q

If the flight controls are operating in the Direct mode are the primary flight computers still being used?

A

No

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19
Q

If the flight controls are operating in the Direct mode are there any other functions lost in Secondary mode?

A

The Manual Rudder Trim Cancel switch, Yaw damping

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20
Q

Can Direct mode be manually selected?

A

Yes, by moving the PRIMARY FLIGHT COMPUTERS DISCONNECT switch to DISC

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21
Q

Where is the primary pitch trim control located?

A

On each pilot’s control column

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22
Q

Can the primary pitch trim control be used with the autopilots engaged?

A

No, they are inhibited

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23
Q

In normal flight does the primary pitch trim control position the stabiliser directly?

A

No, they change the reference speed in the PFCs

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24
Q

Where is the alternate pitch trim control located?

A

On the control stand

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25
Should the alternate pitch trim control be used with the autopilots engaged?
No
26
In normal flight does the alternate pitch trim control position the stabiliser directly?
Yes, the levers are directly linked to the stabiliser via control cables.
27
Which has priority, primary or alternate pitch trim commands?
Alternate pitch trim commands have priority over wheel pitch trim commands in all flight control modes
28
In Normal mode, how is the overspeed protection feature implemented?
At Vmo/Mmo, overspeed protection limits the trim reference speed so that nose down trim is inhibited. Continuous forward control column force is required to maintain airspeed above Vmo/Mmo
29
In Normal mode, how is the stall protection feature implemented?
Stall protection limits the trim reference speed so that nose up trim is inhibited at the minimum manoeuvering speed
30
How does the elevator feel control differ when there is a change from Normal to Secondary or Direct modes?
In secondary and direct modes the elevator variable feel system provides two feel force levels (vice continuous variation with airspeed): force levels change with flap positionl flaps up - feel forces provide manoeuvre force levels that discourage overcontrol in pitch axis at high speed; flaps out of up - feel forces decrease, giving force levels appropraite for App and Landing
31
How many stabiliser trim modules are there?
Two
32
How can the respective hydraulic system be cut off from the stabiliser trim modules?
Selecting CUT OUT on the stabilser cut out switches
33
What does the EICAS warning message STABILIZER mean?
Both stabilser control modules have automatically shut down, or failed; it will also appear if automatic shutdown fails to stop uncommanded motion
34
Under what circumstances would the message STABILIZER CUTOUT replace STABILIZER?
When both stabiliser cut out switches are in the CUT OUT position
35
In the Normal flight control mode, is pitch trim still available if the stabiliser is manually shut down, or failed?
Yes
36
Where is the stabiliser trim position displayed?
On the aisle stand and also on the flight control synoptic
37
What does the green band indicate?
The acceptable range for take off stabiliser trim positions
38
What does the EICAS advisory STAB GREENBAND mean?
Nose gear pressure switch disagrees with computed stabiliser greenband
39
What action should you take for STAB GREENBAND?
Verify that Take Off thrust, flaps, gross weight and CG are entered correctly
40
How is roll control augmented?
Spoilers begin to extend after several degrees of control wheel rotation
41
How is the bank angle protection achieved?
If the angle of bank exceeds 35 degrees a control wheel force rolls the aircraft back to within 30 degrees of bank
42
Can you override this protection?
Yes
43
Is bank angle protection provided in Secondary and Direct modes?
No
44
What is the purpose of the Rudder Ratio Changer?
Reduces rudder deflection as airspeed increases to prevent over stressing
45
How is the function implemented in the Secondary mode?
Degraded to two fixed ratios determined by flap position; flaps up - less response to pedals; flaps down - more response
46
How is Thrust Asymmetry Compensation implemented?
Rudder deflection is automatically applied proportional to difference in thrust levels between engines if greater than 10%
47
Do the pedals move in response to TAC?
Yes
48
How could you check how much rudder is being applied?
Check the rudder trim indication on the aisle stand or on the flight control synoptic
49
Can you override TAC inputs?
Yes, by making rudder pedal inputs
50
Can you disconnect TAC?
Yes, by pushing the TAC switch on the overhead panel
51
What is the Wheel to Rudder Cross-tie functions?
Provides the capability of controlling the initial effects of an engine failure using control wheel inputs only
52
When is this function operative?
Below 210 knots
53
Does the function operate in all flight control modes?
No, only in Normal mode
54
What does the EICAS advisory SPOILERS mean?
Failure of a single or multiple spoiler pairs
55
With the speedbrake lever armed what conditions must be satisfied to deploy the speedbrakes automatically on landing?
On the ground with both thrust levers at idle
56
Would the speedbrakes deploy automatically on landing if the lever was left DOWN?
Yes, when reverse thrust is selected
57
I, after touchdown, a Go-around was initiated, would the spoilers retract automatically?
Yes, when either thrust lever is advanced to the takeoff position
58
Is Auto speedbrake available in Secondary and Direct modes?
No
59
What do flap selection number (and line) magenta mean?
The slats and flaps are in transit to the commanded position
60
What do flap selection number (and line) green mean?
The slats and flaps are in the commanded position
61
When does the flap indicator finally blank on EICAS?
10 seconds after slat retraction
62
What are the 3 modes of flap/slat operation?
Primary, Secondary and Alternate
63
What powers the devices in each flap/slat mode?
Hydraulic (centre system), electric and electric
64
What selections are necessary to extend the flaps and slats in the Alternate mode?
Alternate Flap Arm Switch to ARM, Alternate Flap selector rotate to EXT. Selector OFF when slats/flaps are in the required position
65
Will the slats and flap extension movements be sequenced?
No, they will move simultaeously
66
What happens if EXT is selected after the flaps reach position 20?
Nothing
67
If RET is selected, which moves first, slats and/or flaps?
Flaps, slat retraction is inhibited until flaps are UP
68
At 200kts, Flaps 1 is selected (from UP) and the EICAS message 'SLATS PRIMARY FAIL' immediately appears. What happens to the Slats and Flaps?
Slats move all the way to the down (gapped) position (to improve stall handling characteristics): the Flaps remain UP
69
The aircraft then accelerates to 240kts. What changes (if any) occur to the slats and flaps?
Slats retract to the mid range (sealed) position: No change to the Flaps
70
What will the Slats and Flaps do if when selecting Flaps 5 from Flaps 1 the message 'SLATS PRIMARY FAIL' appears?
Once in the mid-range (sealed) position when the secondary mode is engaged they remain there until the Flaps are retracted to UP or extended beyond 20
71
During normal operation in which flap selections will the slats be at the midrange (sealed) position?
1, 5, 15, 20
72
During normal operation in which flap selections will the slats be at the down (gapped) position?
25, 30
73
When the flap lever is moved from UP to 1 what happens to the Flaps?
They remain in the UP position
74
When the flap lever is moved from UP to 1 what happens to the Slats?
Slats move to the midrange (sealed) position
75
When is flap and slat extension from the UP position inhibited?
When the speed is greater than 265 knots or altitude is above 20000 feet
76
The flaps are selected from 5 to 20 for the approach when the FLAPS PRIMARY FAIL appears. What happens to the flaps and slats?
Slats remain in the midrange (sealed) position. Flaps operate in the secondary mode, moving to 20 on electrical power
77
In primary mode, the aircraft approaches a stall with the flaps and slats UP, will any of the devices move?
No, the stall characteristics are unchanged
78
In primary mode, the aircraft approaches a stall with the flaps and slats UP, will any of the devices move if the flaps were at 1?
Yes, the slats would move from the midrange (sealed) position to the down (gapped) position to enhance stall characteristics
79
When might you see the SPEEDBRAKES EXT message?
If speedbrakes are extended with any of the following: 1. Flaps at Land 2. Below 800 feet RA 3. Thrust lever not closed

Boeing 777 (16 decks)

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