Microlight » Air Law » Other Hazardous Airspace

Volcanic Hazard Zone (VHZ)

A Volcanic Hazard Zone (VHZ) is established around an area affected by volcanic activity.

A pilot must not operate within a VHZ:

• at night; or

• in IMC.

During the day in VMC, a pilot may enter only after determining that the volcanic hazard will not affect the safety of the flight, taking into account:

• relevant NOTAM information; and

• SIGMET information.

There is no administering authority from which to obtain an entry clearance.

Volcanic Hazard Zones are shown on charts by the letter V followed by a three-digit number.

Key point

VHZ = no night or IMC operations; daytime VMC entry only after assessing the volcanic hazard.

Mandatory Broadcast Zones (MBZ)

A Mandatory Broadcast Zone (MBZ) is established in uncontrolled airspace where there may be high traffic density or special operations.

When operating in an MBZ, the pilot must:

• make the required radio broadcasts on the specified frequency;

• include the aircraft callsign, position, altitude and intentions;

• make broadcasts at the required positions and intervals; and

• maintain a listening watch.