FLIGHT CONTROL LAWS

Question 1

WHAT IS ALPHA-FLOOR?

Answer 1

it’s a protection that commands TOGA thrust from liftoff - 100ft regardless of thrust lever position.
When the A/C angle-of-attack A-FLOOR threshold has been reached and the A/C decelerates significantly then it commands TOGA.

FCOM DSC-22_40-30 ALPHA-FLOOR PROTECTION
FCOM DSC-22_30-50-50
FCTM AS-FG-10-2 ALPHA FLOOR

Question 2

WHAT IS VLS?

Answer 2

Lowest Selectable Speed

1. 13VS for T/OFF, touch & go
2. 23VS after flap retraction of 1 step
3. 28VS Clean

FCOM DSC-22_10-50-20

Question 3

WHAT IS V-ALPHA MAX?

Answer 3

Max AOA speed. corresponds to the max AOA that may be reached in Normal Law.

FCOM DSC 22_10-50

Question 4

WHAT IS VMAX? AND WHEN DOES THE OVERSPEED WARNING HAPPEN?

Answer 4

MAX speed represented by the bottom of the red/black strip of the speed scale.
VMAX + 6kts

Question 5

WHAT IS V-ALPHA PROT?

Answer 5

When reached at low speeds ( ALPHA PROT +1) then:

-the autopilot disconnects and the A/C rolls wings level and pitches down to maintain ALPHA PROT.

Question 6

AT WHAT POINT DOES THE AP DISCONNECT DURING HIGH SPEED PROTECTION?

Answer 6

VMO + 15kt or MMO + 0.04

FCOM DSC-27-20-10-20

Question 7

WHAT IS VMCG?

Answer 7

Minimum spd on the ground during takeoff which the A/C can be controlled during an ENG FAIL.

FCOM DSC-22_10-50-30

Question 8

WHAT IS VMCL?

Answer 8

Minimum control spd in flight (MAX bank of 5*) if 1 ENG FAILS in APP flap setting

FCOM DSC-22_10-50-30

Question 9

WHERE DOES V-ALPHA PROT, V-ALPHA MAX AND VSW GET THEIR DATA FROM?

Answer 9

They are computed via the FAC based on aerodynamic data for display on the PFD.
ACTIVATION of the protections is computed by the ELAC.

FCOM DSC-22_10-50-40

Question 10

WHEN DOES THE ECAM DISPLAY AN OVERSPEED?

Answer 10

VMAX + 4kt

Question 11

WHAT IS THE RECOVERY PROCEDURE FOR AN OVERSPEED?

Answer 11

Select a lower spd or reduce power

Use SPEED BRK.

Question 12

WHAT IS THE LOAD FACTOR PROTECTION?

Answer 12

It is limited to:
+2.5g & -1g in CLEAN
+2g & 0g for other CONFIGS

FCOM DSC-27-20-10-20

Question 13

WHAT IS PITCH ATTITUDE PROTECTION?

Answer 13

For excessive pitch attitudes at low spd the A/C will reduce AOA.

30* up in 0-3 CONF - will reduce to 25*
25* up in FULL - will reduce to 20*
15* nose down - indicated by green = sign

FD bars will disappear when pitch exceeds 25* up or 13* down. Will return when angle is 22* and 10* respectively

FCOM DSC-27-20-10-20

Question 14

WHAT IS GROUND MODE?

Answer 14

It is the direct relationship between sidestick deflection and elevator deflection without autotrim.

it may reduce max elevator deflection from 30* to 20*

FCOM DSC-27-20-10-20

Question 15

WHAT IS FLIGHT MODE?

Answer 15

NORMAL LAW FLIGHT MODE is a load factor demand mode.

Question 16

WHAT IS FLARE MODE?

Answer 16

When passing 100ft the THS is frozen. The sidestick deflection relates directly to the elevator without trim for full elevator authority at landing.

FCOM DSC-27-20-10-20

Question 17

WHAT IS BANK ANGLE PROTECTION?

Answer 17

• A protection which will limit AOB to 67* and any increase over 33* it will automatically roll and return the the A/C to 33*
• If AOA protections are active it will limit bank to 45*
• If high spd protection active it will be limited to 40* and will always return to 0*
• If 45* is exceeded the autopilot will disconnect & FD bars disappear, they return when at 40*

FCOM DSC-27-20-10-30

Question 18

WHAT ARE THE PROTECTIONS IN NORMAL LAW?

Answer 18

• LOAD FACTOR
• PITCH ATTITUDE
• BANK ANGLE
• HIGH SPEED
• HIGH AOA