ATS AIRSPACE CLASSIFICATION

ENR 1.4 ATS AIRSPACE CLASSIFICATION

ATS airspace are classified and designated in accordance with the following:

1 CLASS A

Ha Noi and Ho Chi Minh FIRs:

Lateral limit: Ha Noi and Ho Chi Minh FIRs
Vertical limit: from 6 000 M to 14 000 M

	IFR	VFR
Separation provided	IFR from IFR	No
Service provided	Air traffic control service	No
VMC visibility and distance from cloud minima*	Not applicable	No
Speed limitation	Not applicable	No
Radio communication requirement	Continuous two-way	No
Subject to an ATC clearance	Yes	No

2 CLASS C

2.1 On the ATS routes: From minimum flight level to 6 000 M.

2.2 TMA: Noi Bai, Tan Son Nhat. CTR: Noi Bai, Tan Son Nhat, Da Nang

	IFR	VFR
Separation provided	IFR from IFR; IFR from VFR	VFR from VFR: Traffic information service
Service provided	Air traffic control service	Air traffic control service for separation from IFR
VMC visibility and distance from cloud minima*	Not applicable	8 KM at and above 3 050 M (10 000 FT) AMSL. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM below 3 050 M (10 000 FT) AMSL and above 900 M (3 000 FT) AMSL or above 300 M (1 000FT) above terrain whichever is higher. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM at and below 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain whichever is higher. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
Speed limitation	250 kt IAS below 3 050 M (10 000 FT) AMSL	250 kt IAS below 3 050 M (10 000 FT) AMSL
Radio communication requirement	Continuous two-way	Continuous two-way
Subject to an ATC clearance	Yes	Yes

3 CLASS D

The responsibility areas of the TWRs at the civil aerodromes, the aerodromes (using both civil and military) over the territory of Viet Nam (except CTR of Noi Bai, Da Nang, Tan Son Nhat).

	IFR	VFR
Separation provided	IFR from IFR	Not applicable
Service provided	Air traffic control service, traffic information about VFR flights	Traffic information about IFR flights
VMC visibility and distance from cloud minima*	Not applicable	8 KM at and above 3 050 M (10 000 FT) AMSL. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM below 3 050 M (10 000 FT) AMSL and above 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain whichever is higher: 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM at and below 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain whichever is higher: 1 500 M horizontal; 300 M (1 000 FT) vertical distance from cloud.
Speed limitation	250 kt IAS below 3 050 M (10 000FT) AMSL	250 kt IAS below 3 050 M (10 000 FT) AMSL
Radio communication requirement	Continuous two-way	Continuous two-way
Subject to an ATC clearance	Yes	Yes

4 CLASS E

4.1 FIRs:

Above 14 000 M

Lateral limit: Ha Noi and Ho Chi Minh FIRs.
From 2 000 M to 6 000 M

Lateral limit: Ha Noi and Ho Chi Minh FIRs, except ATS routes and TMA, CTR of C and D classes.

4.2 Airspace around the aerodromes

Airspace of the aerodromes and heliports to be provided with the air traffic control service by the TWR concerned but there are no instrumental corridors (for Departure and Arrival);

Transition area (Departure and Arrival routes of the aerodromes having C, D airspaces that not mentioned above).

	IFR	VFR
Separation provided	IFR from IFR	Not applicable
Service provided	Air traffic control service, traffic information about VFR flights as far as practical	Traffic information as far as practical
VMC visibility and distance from cloud minima*	Not applicable	8 KM at and above 3 050 M (10 000 FT) AMSL. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM below 3 050 M (10 000 FT) AMSL and above 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain whichever is higher. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM at and below 900 M (3 000 FT) AMSLor above 300 M (1 000FT) above terrain whichever is higher. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
Speed limitation	250 kt IAS below 3 050 M (10 000 FT) AMSL	250 kt IAS below 3 050 M (10 000 FT) AMSL
Radio communication requirement	Continuous two-way	Not applicable
Subject to an ATC clearance	Yes	No

5 CLASS G

5.1 Unspecified airspace

5.2 CTR

The responsibility areas of the TWRs of which operations are based on time limits or from sunrise to sunset: out of operation time and service provided.

	IFR	VFR
Separation provided	Not applicable	Not applicable
Service provided	Flight information service	Flight information service
VMC visibility and distance fromcloud minima*	Not applicable	8 KM at and above 3 050 M (10 000 FT) AMSL. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM below 3 050 M (10 000 FT) AMSL and above 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain whichever is higher. 1 500 M horizontal; and 300 M (1 000 FT) vertical distance from cloud.
	Not applicable	5 KM** at and below 900 M (3 000 FT) AMSL or above 300 M (1 000FT) above terrain whichever is higher. Clear of cloud and ground or water in sight.
Speed limitation	250 kt IAS below 3 050 M (10 000 FT) AMSL	250 kt IAS below 3 050 M (10 000 FT) AMSL
Radio communication requirement	Continuous two-way	No
Subject to an ATC clearance	Yes	No

* When the height of the transition altitude is lower than 3 050 M AMSL, FL 100 should be used instead of 3 050 M (10 000 FT).

** When so prescribed by Civil Aviation Authority of Viet Nam:

Lower flight visibilities to 1 500 M may be permitted for flights operating:
1. At speeds that will observe other traffic or any obstacles in time to avoid collision; or
1. In circumstances in which the probability of encounters with other traffic would normally be low and for aerial work at low altitude;
Helicopters may be permitted to operate in less than 1 500 M flight visibility, if manoeuvred at a speed that will give adequate opportunity to observe other traffic or any obstacles in time to avoid collision.