RX Boeing 787 GACA Preparation > Systems - Flight Control > Flashcards

Systems - Flight Control Flashcards

(58 cards)

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1
Q

What does the normal light mean on tail & wing switches (flight control surfaces)?

A
  • The respective flight control surfaces are unlocked
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2
Q

What does the LOCK amber light means on tail & wing switches (flight control surfaces)? When do flight controls automatically unlock?

A
  • The flight control surfaces are locked,
  • Flight Controls automatically unlock when ground speed exceeds 40 kts.
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3
Q

When will the flight control surfaces FAIL light illuminate?

A

When a lock switch is in the lock position and any of the associated surfaces are not locked

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4
Q

How many flight control modes does the aircraft have?

A
  • Normal
  • Secondary
  • Direct
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5
Q

How many PRIMARY FLIGHT CONTROL COMPUTERS does the B787 have?

A

3 PFC’s

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6
Q

How many ACE’s - Actuator Control Electronics are there?

A

4 ACE’s

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7
Q

What information do the PFCs use from other airplane systems?

A
  • IRU (Inertial Reference Unit)
  • Slats & Flaps position
  • ADR (Air Data Reference)
  • Radio altitude
  • Engine thrust
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8
Q

What will cause the primary flight control to switch to secondary mode?

A

When inertial or air data is insufficient to support normal mode or when all slat and flap position data is unavailable

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9
Q

In the event of loss of all hydraulic power, what flight controls are available?

A
  • Electrically actuated stabilizer (ALTN TRIM)
  • 2 spoiler pairs, through the control wheel
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10
Q

If there is a complete loss of flight control signaling, what flight controls are available?

A
  • Electrically actuated stabilizer (ALTN TRIM - direct wiring)
  • 1 spoiler pair, through the control wheel
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11
Q

What is the Envelope protection?

A
  • Stall protection
  • Overspeed protection
  • Bank angle protection
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12
Q

What are the 3 flaps operating modes?

A
  • Primary
  • Secondary
  • Alternate
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13
Q

When do the flaps and slats operate in secondary mode?

A
  • When the Center hydraulic system has failed
  • Flaps or slats primary control failure
  • Control surface travel at less than 50% of the normal hydraulic rate
  • Primary mode fails to move the flaps and slats to the selected position
  • Flaps or slats disagree is detected
  • Uncommand flaps or slats motion is detected
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14
Q

What is the difference between flaps and slats Primary, Secondary and Alternate operations?

A
  • Primary: Hydraulic
  • Secondary: Electric or Hydraulic
  • Alternate: Electric
    Note: Eletric operation is considerably slower.
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15
Q

When is primary pitch trim inhibited?

A

When autopilot engaged

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16
Q

Which has priority, Primary or Alternate pitch trim?

A

Alternate pitch trim

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17
Q

On ground, moving the pitch trim moves which control surface?

A

Stabilizer

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18
Q

In normal mode, moving the pitch trim does what in flight?

A

It makes inputs to the PFCs to change the trim reference speed

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19
Q

What are the power sources for the horizontal stabilizer?

A
  • L2 AC bus
  • R2 AC bus
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20
Q

During flight, moving the pitch trim while in Secondary or Direct mode moves what control surface?

A

The Stabilizer

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21
Q

In which mode is Flight Envelope Protection available?

A

Normal Mode

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22
Q

Can the crew select secondary mode manually?

A

No

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23
Q

In Secondary mode, what type of command do the 3 PFCs compute flight control surface commands? Are the ACEs fully functional?

A

The PFC’s use simplified commands and the ACE’s are fully functional

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24
Q

What functions are not available in the Secondary and Direct modes?

Study These Flashcards
A
  • Flight Envelope Protection
  • Autopilot
  • Auto speedbrakes
  • Pitch Compensation
  • Gust suppression
  • Tail strike protection
  • Roll/Yaw asymmetry compensation
25
When will the **Flight Control System** revert to **Direct mode**?
- When all 3 PFC's have failed or loss of communication between the PFC's and ACE's. - It can also be selected by disconnecting the PFC switch to DISC
26
What functions are still available in **Secondary and Direct modes**?
* Full airplane control is available * All Flight Control Surfaces are operable
27
In Normal mode, what control surface is moved when the **pitch trim** is applied?
The Elevator is moved, then the Stabilizer is streamlined with the Elevator
28
In normal mode if the **Stabilizer** is shut down, what does the pitch trim do?
It changes the trim reference speed by utilizing the Elevators
29
Where and when is the **stabilizer position indication** displayed?
* Displayed on the EICAS and Flight Control Synoptic * From power up: until 10 sec after gear up OR 60 sec after liftoff * After landing: any pair of pitch trim switches are used or ground speed less than 40kts * On the Flight Control Synoptic it’s constantly displayed
30
When does the **STAB GREENBAND EICAS message** appear?
* The computed green band disagrees with the pressure transducer data * The 2-transducer values are not within the set tolerance * Either transducer has failed
31
What does the stabilizer **green band** compare for the correct stab trim?
It compares the FMC calculated stab trim data and the pressure transducer data
32
What is the **default range** of the stab green band?
The green band is shown from 4 to 9 units
33
How does the **stall protection system** operate?
The system limits the speed at which the airplane can be trimmed
34
Does the B787 have **asymmetry for loss of thrust**?
Yes, the Roll and Yaw asymmetry is controlled by the flight control system. Automatic rudder input is provided, an the rudder pedals move to give feedback to the pilots
35
In flight, what does movement of the **rudder pedals** command in normal mode?
It commands a sideslip maneuver, which commands a rudder input
36
How does the flight control system maintain **yaw on ground** in an engine failure?
On ground and speed above 60 kts the system commands rudder to counter the yaw due to an engine failure
37
After initial input, how does the system offload any **lateral control input**?
The system transfers any steady state lateral control input to the rudder, resulting in a small side slip
38
What is the **wheel to rudder cross-tie** and when is it available?
- It's available in secondary and direct mode - It reduces maximum side alip and fin loads.
39
What provides **turn coordination** and **Dutch roll damping** in the normal mode?
- Roll/Yaw control laws
40
How many **rudder trim rates** are available?
2 rates, a low rate, and a high rate
41
When are any manual **rudder trim inputs** automatically zeroed?
* During the takeoff roll when ground speed exceeds 30 kts * During landing when the airplane transitions from air mode to ground mode
42
Where is **rudder trim** displayed?
On the EICAS and on the synoptic page
43
In secondary mode, rudder pedals send what command to the rudder?
- It commands a rudder deflection instead of a maneuver command
44
What is the purpose of the **Rudder Ratio Changer**? What is it based on in Secondary and Direct mode?
- It automatically reduces the sideslip command as airspeed increases, while pedal forces do not change. - In Secondary and Direct mode, the rudder ratio is based on flap position.
45
What is **auto drag** and when is it used?
* It deflects the ailerons upward and raises the 2 most outboard spoilers, while maintaining airspeed, to assiste in glideslope/glidepath capture when the airplane is on or above vertical path. * Autodrag also functions when the aircraft carries out an aproach in V/S or FPA mode. * Available ONLY in the landing configuration flap 25 or 30 and the thrust levers are at idle. * The deflection is gradually removed at 500' AGL. * Available in normal mode only
46
Which control surfaces are **locked out at high speed**?
* The ailerons are locked out * Flaps & Slats are also locked out above 260 kts ## Footnote Prevents excessive aerodynamic loads.
47
Are all **spoilers** hydraulically controlled?
No, 2 pairs are electrically controlled
48
When will the **speed brake** retract automatically?
* On the ground, when either thrust levers move to take off range * On the ground, if there is transition to in the air * In the air, when either thrust lever is beyond 70% full travel
49
When will the **speed brakes** automatically extend?
When not ARMED: * On ground, with ground speed above 85 kts and both thrust levers previously in takeoff range, then moved to IDLE range (rejected Takeoff) * On ground, when both reverse levers are moved to reverse idle. When ARMED: - On landing when main gear trucks untilt and both thrust levers are not in takeoff range
50
Describe the **Cruise Flaps function**?
- The system is fully automated. It moves the flaps, ailerons, flaperons and spoilers to enhance the wing camber and reduce drag. - They are only available in normal mode **above 25000'** between **0.54 Mach & 0.87 Mach**.
51
When will the **EICAS advisory message** (Cruise Flaps SYS) display?
If the system fails with the flaps in an increased drag condition
52
Which **hydraulic system** power the Flight Controls?
All 3 Hydraulic systems
53
When is **Flap Load Relief** available?
- In the primary mode, the Flap load relief system protects the flaps from excessive air loads. If a flap placard limits are exceeded with flaps 15 though 30 position, LOAD RELIEF is displayed and the flap automatically retract to a safe position appropriate to the airspeed. - Load relief is limited to flaps 5 position.
54
When is **Slat Load Relief** available?
It is available in Slat Secondary mode **only**. If airspeed exceeds 240 kts with Slats fully extended, they retract to the MID position. When the speed is below 240 kts slats return to fully extended position. Provided the flaps are not in the UP position. (SLAT PREGAP)
55
What is the **Slats and Flaps sequence**?
* Flaps 1: Slats MID, Flaps 0 * Flaps 5,10,15,17,18 and 20: Slats MID, Flaps to selected position * Flaps 25: Slats FULL, Flaps do not move * Flaps 30: Slats FULL, Flaps Landing position
56
How are the **Alternate Flaps/Slats powered**? What is the maximum extension available?
- By the 3 position Alternate Flap Selector. - Slats MID position, Flaps 20 ## Footnote Provides an alternative method of operation.
57
What kind of protection is lost in the slats and flaps **alternate mode** ? And in **direct mode**?
Flap Primary Mode: - All Protections Secondary Mode: (Loses) - Slat autogap - Flaps (only) Load relief ALTN Mode: (Loses) - Uncommanded motion Protection - Flap / Slat Load Relief - Slat Autogap + Pregap - Flap / Slat Assymetry protection - Flaps / Slats Disagree
58
What is the difference between **slat autogap** and **slat pregap**?
* Autogap: Available in primary mode when the slats are middle position and speed is below 240 knots. At a high angle of atack (AOA), autogap fully extends the slats to increase wing camber, thus increasing the lift and margin to stall. The slats returnt to the middle position after angle of atack decreases. The autogap trip threshold is a function of AOA, airspeed and Flap position. * Pregap: In secondary mode the system is too slow to respond to an autogap request, so a pregap function exists. The slats automatically move to the fulle extended position from middle position when the flaps lever is not UP and the speed is less than 240 Kts. The slats remains in the extended position until the flap lever is in the UP position or airspeed is above 240 knots.
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