Supplementary Procedures - PRO-SUP-10 Operating Speeds Definition

Question 1

003- How are the PFD/MCDU Speeds Calculated by the A/C?

PRO-SUP-10 P1

Answer 1

• The PFD Speeds are Computed by the Flight

Augmentation Computer (FAC)

• The MCDU Speeds are Computed by:

* The FMS based on the A/C Gross Weight

(which is Automatically Calculated by

entering ZFW and FOB for T/O)

OR

* The Predicted Gross Weight (for APP or G/A).

Question 2

004- What are VS, VS1g & V2

PRO-SUP-10 P1

Answer 2

VS is the Stall Speed

VS = 0.94 VS1g (Stall Speed Under 1G)

V2 = 1.2 VS = 1.2 x 0.94 VS1g = 1.13 VS1g

FCOM will use ‘VS’ for ‘VS1g’ but they are Not Identical.

Question 3

005- What the Definition of VLS, F, S & Green Dot (G.Dot) Speeds.

PRO-SUP-10 P2

Answer 3

VLS: Lowest Selectable Speed

F: Minimum Speed for Flaps Retraction at T/O

S: Minimum Speed for Slats Retraction at T/O

G.Dot: Engine-Out Speed in Clean Configuration

Also Equal to the Final TakeOff Speed

* For VS Factor (1.23, 1.28 VS) refer to PRO-SUP-10 P2

Question 4

006- How is Green Dot Calculated on A320/A321?

PRO-SUP-10 P2

Answer 4

A320:

Below 20.000 Ft = 2 × Weight (Tons) + 80

Above 20.000 Ft –> ADD 1 Kt / 1000 Ft

A321:

Below 20.000 Ft = 1.5 × Weight (Tons) + 110

Above 20.000 Ft –> ADD 1 Kt / 1000 Ft

Question 5

007- How are V Alpha PROT, V Alpha MAX and VSW Computed?

PRO-SUP-10 P4

Answer 5

V Alpha PROT, V Alpha MAX & VSW are computed by:

• The FAC Based on Aerodynamic Data

They are Displayed Only on the PFD

* They are NOT Used for Flight CTRL PROT

Please Note:

The Activation of the Protections is made by the ELAC.

Question 6

008- What the Definition of V Alpha PROT and V Alpha MAX?

PRO-SUP-10 P4

Answer 6

V Alpha PROT : Angle of Attack Protection Speed

Represented by the Top of a Black & Amber Strip

along the PFD Speed Scale, in Normal Law

V Alpha MAX : Maximum Angle of Attack Speed

Represented by the Top of a Red Strip along

the PFD Speed Scale, in Normal Law.

Question 7

009- What the Definition of VSW and VMAX?

PRO-SUP-10 P4

Answer 7

VSW : Stall Warning Speed

Represented on the Lower Speed Scale by a

Red And Black Strip along the PFD Seed Scale

* When the Flight Controls are in Normal Law

VMAX:

Represented on the Top Speed Scale by a

Red And Black Strip along the PFD Speed Scale

* Determined by the FAC According to the A/C

Configuration

* It’s equal to VMO (or MMO), VLE or VFE.

Question 8

010- What the Definition of VA, VMCG, VMCA & VMCL?

PRO-SUP-10 P4

Answer 8

VA: Max Design Manoeuvring Speed

Max Structural Speed with Full Control Deflection

If in Alternate or Direct Law

VMCG (Ground):

Min. Control Speed On Ground During TakeOff at which:

After Failure of the Critical Engine, the A/C can Only be Controlled by Using the Primary Flight Controls,

While the Other Engine Stays at T/O Thrust

VMCA (Airborne):

Min. Control Speed In Flight at which:

If One Engine Fails, the A/C can be Controlled with

a Max. Bank of 5°,

While the Other Engine Stays at T/O Thrust

(TakeOff Flaps with Gear Up)

VMCL (Landing):

Min. Control Speed In Flight at which:

If One Engine Fails, the A/C can be Controlled with

a Max. Bank of 5°,

While the Other Engine Stays at T/O Thrust

(APP Flaps Setting).

Question 9

011- What the Definition of VFE, VFE NEXT, VLE, VLO & VMO?

PRO-SUP-10 P5

Answer 9

VFE: MAX Speed for Each Flap Configuration

VFE NEXT: MAX Speed for the Next Flap Position

VLE: MAX Speed with Landing Gear Extended

VLO: MAX Speed for Landing Gear Operation

VMO: MAX Speed in Operations.

Question 10

012- What the Definition of V1, VR, V2 & VREF?

PRO-SUP-10 P5

Answer 10

V1: The Highest Speed during TakeOff, at which

the Flight Crew has a Choice Between:

Continue TakeOff or Stopping the Aircraft

VR: The Speed after an Engine Failure at which:

The Pilot Rotates in Order to Reach V2 at an

Altitude of 35 Ft at the Latest

V2: TakeOff Safety Speed with One Engine Failed,

Attained Latest by 35 Ft and Maintains During the

Second Segment of the TakeOff

Minimum Value = 1.13 VS for the Config. in Place

VREF: Ref. Speed used for Normal Final Approach

= 1.23 × VS of CONF FULL.

Question 11

013- What the Definition of VAPP?

PRO-SUP-10 P6

Answer 11

VAPP: Final Approach Speed.

Calculated by the FMGC = VLS + Wind Corr

The Wind Corr is Limited from Min 5 Kt to Max 15 Kt

* Must Not Be Lower than VLS +5 Kt if:

• Autoland
• A/THR ON
• Ice Accretion
• X-Winds > 20Kt

* Must Not Be Lower than VLS +10 Kt if:

• LAND CONF 3 with Ice Accretion.

Question 12

014- What the Definition of VAPP TARGET?

PRO-SUP-10 P6

Answer 12

VAPP TARGET: Represented by a Magenta Triangle

* Calculated by the FMGCs, gives Guidance in Approach during Various Windy Conditions

* VAPP TARGET = GS Mini + Actual Headwind

(Measured by ADIRS)

* GS Mini = VAPP - Headwind

(Entered in the MCDU).