ENR 1.2 VISUAL FLIGHT RULES

1 
Except when operating as a special VFR flight, VFR flights shall be conducted so that the aircraft is flown in conditions of visibility and distance from clouds equal to or greater than those specified in Table below.
Altitude spectrum
Airspace class
Flight visibility
Distance from ACFT to cloud
At and above 3 050 M (10 000 FT) AMSL
C D E G
8 KM
1 500 M horizontal and 300M (1 000 FT) vertical distance from cloud
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
C D E G
5 KM
1 500 M horizontal and 300M (1 000 FT) vertical distance from cloud
At and below 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain, whichever is higher
C D E
5 KM
1 500 M horizontal and 300M (1 000 FT) vertical distance from cloud
At and below 900 M (3 000 FT) AMSL or above 300 M (1 000 FT) above terrain, whichever is higher
G
5 KM*
Clear of cloud and ground ( or water) in sight
When the height of the transition altitude is lower than 3 050 M AMSL, FL100 should be used in lieu of 3 050 M (10 000 FT).
(*) When so prescribed by Civil Aviation Authority of Viet Nam:
a. Lower flight visibilities to 1 500 M may be permitted for flights operating:
b. Helicopters may be permitted to operate in less than1 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.
2 
Except when a clearance is obtained from an air traffic control unit, VFR flights shall not take off or land at an aerodrome within a control zone, or enter the aerodrome traffic zone or traffic pattern:
  1. When the ceiling is less than 450 m (1 500 ft); or
  2. When the ground visibility is less than 5 km.
3 
VFR flights between sunset and sunrise shall be operated in accordance with the conditions prescribed by Civil Aviation Authority of Viet Nam.
4 
Unless authorized by Civil Aviation Authority of Viet Nam, VFR flights shall not be operated:
  1. Above FL 200;
  2. At transonic and supersonic speeds;
  3. More than 180 km seaward from the shore line within controlled airspace.
5 
Except when necessary for taking-off or landing, or except by permission from the appropriate authority, a VFR flight shall not be flown:
  1. Over the congested areas of cities, towns or settlements or over an open- air assembly of persons at a height less than 300 m (1 000 ft) above the highest obstacles within a radius of 600 m from aircraft;
  2. Elsewhere than as specified in 5a.,at a height less than 150 m (500 ft) above the ground or water.
6 
Except where otherwise indicated in air traffic control clearances or specified by Civil Aviation Authority of Viet Nam, VFR flights in cruising level when operated above 900 m (3 000 ft) from the ground or water, or a higher datum as specified by Civil Aviation Authority of Viet Nam, shall be conducted at a flight level appropriate to the track as specified in the Tables of cruising levels at item ENR1.7.
7 
VFR flights shall comply with the provisions of 3.6 (Air traffic control service) of Annex 2 – ICAO and Articles 30, 31, 32, 33 and 34 of the Regulation on Rules of the Air and Air Traffic Services of Viet Nam:
  1. When operated within Classes C and D airspace;
  2. When forming part of aerodrome traffic at controlled aerodromes; or
  3. When operated as special VFR flights.
8 
An aircraft operated in accordance with the visual flight rules which wishes to change to compliance with the instrument flight rules shall:
  1. If flight plan was submitted, communicate the necessary changes to be effected to its current flight plan; or
  2. When so required by the provision of 3.3.1.2 of Annex 2 – ICAO or Article 23 item 2 of the Regulation on Rules of the Air and Air Traffic Services of Viet Nam, submit a flight plan to the appropriate air traffic services unit and obtain a clearance prior to proceeding IFR when in controlled airspace.