How should aircraft categories be determined for the purpose of establishing aerodrome operating minima?

Aircraft categories should be based on the indicated airspeed at threshold (VAT), which is equal to the stalling speed (VSO) multiplied by 1.3 or, where published, the 1-g stall speed (VS1g) multiplied by 1.23 in the landing configuration at the maximum certified landing mass. If both VSO and VS1g are available, the higher resulting VAT should be used.

What is the formula for calculating VAT when both VSO and VS1g are published?

VAT is equal to VSO multiplied by 1.3 or VS1g multiplied by 1.23. If both are available, the higher resulting VAT should be used.

Which stall speed values are used to compute VAT, and under what conditions?

VAT is computed using the stalling speed (VSO) multiplied by 1.3, or where published, the 1-g stall speed (VS1g) multiplied by 1.23, in the landing configuration at the maximum certified landing mass.

What is the VAT range for aircraft category C?

Aircraft category C corresponds to VAT from 121 to 140 kt.

Which aircraft category includes VAT values from 166 to 210 kt?

Aircraft category E includes VAT values from 166 to 210 kt.

What is the VAT threshold for aircraft category A?

Aircraft category A corresponds to VAT less than 91 kt.

What is the VAT range for aircraft category B?

Aircraft category B corresponds to VAT from 91 to 120 kt.

What is the VAT range for aircraft category D?

Aircraft category D corresponds to VAT from 141 to 165 kt.

If an aircraft has a VAT of 140 kt, which category does it fall into?

A VAT of 140 kt falls into aircraft category C, which covers VAT from 121 to 140 kt.

If an aircraft has a VAT of 91 kt, which category does it fall into?

A VAT of 91 kt falls into aircraft category B, which covers VAT from 91 to 120 kt.

If an aircraft has a VAT of 165 kt, which category does it fall into?

A VAT of 165 kt falls into aircraft category D, which covers VAT from 141 to 165 kt.

If an aircraft has a VAT of 210 kt, which category does it fall into?

A VAT of 210 kt falls into aircraft category E, which covers VAT from 166 to 210 kt.

If an aircraft has a VAT of 90 kt, which category does it fall into?

A VAT of 90 kt falls into aircraft category A, which covers VAT less than 91 kt.

What is the stalling speed multiplier used for VSO in the VAT calculation?

The stalling speed multiplier used for VSO in the VAT calculation is 1.3.

What is the maximum certified landing mass used for in the context of VAT calculation?

The maximum certified landing mass is the mass at which the stalling speed (VSO) or 1-g stall speed (VS1g) is determined in the landing configuration for the purpose of calculating VAT.

When both VSO and VS1g are available, which value should be used to determine the aircraft category?

When both VSO and VS1g are available, the higher resulting VAT should be used to determine the aircraft category.

What is the regulatory decision that introduced the guidance in GM1 NCC.OP.110?

The guidance in GM1 NCC.OP.110 was introduced by ED Decision 2022/012/R.

What is the stalling speed multiplier used for VS1g in the VAT calculation?

The stalling speed multiplier used for VS1g in the VAT calculation is 1.23.

In which configuration and at what mass is the stall speed determined for VAT calculation?

The stall speed is determined in the landing configuration at the maximum certified landing mass.

What is the full meaning of the abbreviation VAT as used in this section?

VAT stands for indicated airspeed at threshold.

GM1 NCC.OP.110 Aerodrome operating minima -- general

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GM1 NCC.OP.110 Aerodrome operating minima — general

ED Decision 2022/012/R

AIRCRAFT CATEGORIES

(a) Aircraft categories should be based on the indicated airspeed at threshold (V_AT), which is equal to the stalling speed (V_SO) multiplied by 1.3 or where published 1-g (gravity) stall speed (V_S1g) multiplied by 1.23 in the landing configuration at the maximum certified landing mass. If both V_SO and V_S1g are available, the higher resulting V_AT should be used.

(b) The aircraft categories specified in the following table should be used.

Table 16

Aircraft categories corresponding to VAT values

Aircraft category	V_AT
A	Less than 91 kt
B	from 91 to 120 kt
C	from 121 to 140 kt
D	from 141 to 165 kt
E	from 166 to 210 kt

Details

Source-Title: GM1 NCC.OP.110 Aerodrome operating minima -- general View latest amendments

Erulesid: ERULES-1963177438-13528 Compare versions

Domain: Air operations

Applicabilitydate: 30 October, 2022

Entryintoforcedate: 1 July, 2022

Regulatorysource: ED Decision 2022/012/R Navigate

Regulatorysubject: Part-NCC

Typeofcontent: GM to IR (Guidance material to implementing rule)

Parentir: NCC.OP.110 Aerodrome operating minima -- general

Origin: EASA

Category: EAR