Performance

Question 1

When can Perf Calculations be made with/without benefit of Thrust Reversers? (FCOM Performance)

Answer 1

Takeoff:

Dry Runway = Without
Wet Runway = With
Contaminated Runway = With

Landing:

Dry Runway = Without
Wet Runway = Without
Contaminated Runway = With

Question 2

What Margins are added for Takeoff/Landing Winds entered in perf? (FCOM Performance)

Answer 2

Takeoff:

Maximum tailwind is limited to a certified value. There is no maximum certified value for headwind, however a headwind higher than 40 kt results in no additional performance credit.

In accordance with regulation, the computation is based on 150 % of the entered tailwind, and 50 % of the entered headwind.

Landing:

As per regulation, the computation is based on 150 % of the entered tailwind, and 50 % of the entered headwind.

The crosswind component does not affect the calculation of the landing distance. However, a maximum crosswind component is associated with each runway condition.

Question 3

What is REC MAX? (FCOM DSC - 20-40)

Answer 3

The recommended maximum altitude is the lowest of the maximum altitude that:

The aircraft can reach with a 0.3 g buffet margin

The aircraft can fly in level flight at MAX CRZ rating

The aircraft can maintain a V/S of 300 ft/min at MAX CLB thrust

The aircraft can fly at a speed above the Green Dot and below the VMO/MMO

The aircraft is certified at.

The REC MAX altitude is displayed on the PROG page.

Anti-ice is not taken into account for this computation. If icing conditions are expected, use the performance application of the EFB.

A maximum altitude using a 0.2 g buffet margin is also computed. It is not displayed, but the system uses it to limit CRZ ALT entry.