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command revision eg > Flight Control Laws > Flashcards

Flight Control Laws Flashcards

1
Q

What protections do you have in normal law?

A 
Pitch
AoB
High speed
High AoA
Load Factor
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2
Q

What are the pitch protections and limitations in normal law?

A

Clean to flap 3

  • Max 30 degrees NU (25 low speed prot. active)
  • max 15 degrees ND

Config full

  • max 25 degrees NU (20 low speed prot. Active)
  • max 15 degrees ND

FDs disappear at 25 NU and 13ND
FDs reappear at 22 NU and 10 ND

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3
Q

What is the AoA protection and limitation in normal law?

A

When AoA is greater than alpha prot:

  • sidestick demands AoA (not LF)
  • further NU trim is inhibited
  • AP disconnects
  • max AoB = 45 degrees

With pilot input you can reach V alpha max but it can’t be exceeded.

If you release the stick the aircraft will stabilise at V alpha prot.

Between v alpha prot and v alpha max, alpha floor with activate

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5
Q

What are the high speed protections and limitations in Normal Law?

A

Vmo/Mmo = 350kts/0.82m

Protection activates at Vmo/Mmo

  • Max AoB = 40 degrees (not 67)
  • Positive static spiral stability at 0 AoB (not 33) so with neutral stick will roll back and hold 0 degrees
  • pitch trim is frozen
  • as speed increases above Vmo/Mmo sidestick nose down authority is progressively reduced.

Overspeed warning at Vmo +4/Mmo +0.006

  • AP disconnects at Vmo + 15/Mmo + 0.04
  • Stick down authority slowly reduces to 0 at Vmo + 16/Mmo + 0.04
    = can’t ignore it even with stick input.
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6
Q

What are the roll limitations and protections in normal law?

A

Stick = rate of roll

Max rate of roll = 15 degrees per second

Max AoB = 67 degrees, neutral stick will hold 33 degrees
Unless high sped protection active (40 degrees) or AoA protection active (45 degrees)

Protection activated when AoB > 45 degrees

  • no autotrim, back stick pressure required
  • AP and FD disconnects
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7
Q

What protections do you have in Alternate law with protections

A

High speed and low speed stabilities, and load factor protection

The a/c will give you pitch up/down demands to stabilise speed but you can override them.

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8
Q

What protections do you have in Alternate law without protections?

A

Load factor protection

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9
Q

What are the load factor limitations and when are they available?

A

+2.5g to -1g clean
+2g to 0g Config 1,2,3 or full

Available in normal, alternate and abnormal law.

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11
Q

What are the high speed protections and limitations in alternate law?

A

Alternate Law with Protections

  • Vmo/Mmo = 350kts/0.82m

Protection active above Vmo/Mmo

  • nose up demand that you CAN override
  • AP disconnects
  • overspeed warning at Vmo +4/Mmo +0.006

Alternate law Without protections

  • no protections
  • AP disconnects above Vmo/Mmo
  • max speed = 320kts/0.77m
  • over speed warning at Vmo +4/Mmo +0.006
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12
Q

What protections do you have in direct law?

A

None!

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13
Q

What are the roll protections and limitations in alternate law?

A

Stick = direct input

NO BANK LIMIT

Max rate of turn = 30 degrees per second

AP disconnects when AoB > 45 degrees

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15
Q

What protections do you have in abnormal law?

A

Load factor

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16
Q

What are the roll protections and limitations in direct law?

A

Stick = direct input

NO BANK LIMIT

Max rate of turn = 30 degrees per second

Only spoilers 4 and 5 used for roll control, (usually 2,3,4,5)

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16
Q

What is the alternative to AoA protection in Alternate law?

A

Nose down signal given but it is possible to override

AoB compensated to maintain a constant AoA

Speed tape shows Vls and Vsw only

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17
Q

When are you in Abnormal law?

A

AoB > 125 degrees

Pitch > 50 degrees NU
Pitch > 30 degrees ND

Speed > 440kts or 0.9m
Speed < 60kts or 0.1m

AoA > 30-40 degrees
AoA < -10 degrees

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18
Q

What is the low energy alert and when is it available?

A

= ‘speed speed speed’

Only available in normal law and config 2,3 and full between 100ft RA and 2000ft RA.

Requires manual increase in thrust.

19
Q

When does AoA protection activate?

A

When AoA is greater than V alpha prot

20
Q

Which protection is the most important and has priority over all others?

A

AoA protection

21
Q

What is alpha floor?

When is is available?

When does it activate?

A

= automatic TOGA thrust given

= available from lift off to 100ft RA on landing

= activates when alpha goes beyond alpha floor threshold

22
Q

When do you have load factor protection?

A

Normal law
Alternate law
Abnormal law

23
Q

What does the sidestick command in pitch in:
Normal law
Alternate law
Direct law?

A

Normal law stick = load factor
Alternate law stick = load factor
Direct law stick = direct input

24
Q

What does the sidestick command in roll in:
Normal law
Alternate law
Direct law?

A

Normal law stick = rate of roll
Alternate law stick = direct input
Direct law stick = direct input

25
Q

How do you control the aircraft in Mechanical law?

A

Pitch with the trim wheel and stabiliser

Roll with the rudder pedals and rudder

26
Q

In normal law when would the AP drop out?

A

AoB > 45 degrees

AoA > Alpha prot

Speed > Vmo + 15/Mmo + 0.04

Pitch > 25 NU
Pitch > 13 ND

> 10 degrees rudder deflection out of trim

26
Q

In alternate law when would the AP drop out?

A

AoB > 45

Speed > Vmo/Mmo

27
Q

When do you have yaw damping?

If you don’t have yaw damping, what considerations are there?

A

Have yaw damping:

  • normal law
  • Alternate Law
  • direct law (unless ADR 3 has failed)

If don’t have it (mechanical, or abnormal law)
- pilot input on the rudder is required

28
Q

When is slat retraction inhibited? (alpha lock)

A

Below 148kts or 8.5 AoA

29
Q

When does the overspeed warning sound?

Which laws is it available in?

A

Available in:

  • normal law
  • alternate law
  • direct law

= sounds at Vmo + 4/Mmo + 0.006

29
Q

What protections do you have in mechanical law?

What warnings do you get in mechanical law?

A

No protections

Only get the stall warning
NO OVERSPEED WARNING

30
Q

What is the highest speed in Normal Law? (Vmo/Mmo)

A

350kts/0.82

31
Q

What is the highest speed possible in Alternate Law?

A

320kts/0.77

command revision eg (13 decks)

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