Title
PART 20 – METEOROLOGICAL SERVICE FOR INTERNATIONAL AIR NAVIGATION
- Regulation Number : 5556
- Year : 2018
- Date of Gazette : 27/11/2018
- Classification : Administrative Directives
Introduction
Pilots need to be informed about meteorological conditions along the routes to be flown
and at their destination aerodromes. Part 20 has the objective of providing
meteorological service to contribute to the safety, efficiency and regularity of air
navigation. This is achieved by providing necessary meteorological information to
operators, flight crew members, air traffic services units, search and rescue units,
airport management and others concerned with aviation. Close liaison is established
between Ghana Meteorological Agency established by Statute to supply meteorological
information to the Ghana Civil Aviation Authority for the use of airlines, pilots etc.
Suitable telecommunications facilities are made available by the Authority to permit
those aerodromes or airfields without meteorological offices to supply information to
air traffic services and search and rescue services. Telecommunications between the
meteorological office and control towers or approach control offices are such that the
required points may normally be contacted within 15 seconds.
Aerodrome reports and forecasts are required by aeronautical users to carry out their
functions. Aerodrome reports include surface wind, visibility, runway visual range,
present weather, cloud, air and dew-point temperature and atmospheric pressure, and
are issued either half-hourly or hourly. These reports are complemented by special
reports whenever any parameter changes beyond pre-fixed limits of operational
significance. Aerodrome forecasts include surface wind, visibility, weather, cloud and
temperature, and are issued every three or six hours for a validity period of 9 to 24
hours. Aerodrome forecasts are kept under continuous review and amended by the
meteorological office concerned, as and when necessary.
Landing forecasts are prepared for some international aerodromes to meet
requirements of landing aircraft. They are appended to the aerodrome reports and
have a validity of two hours. Landing forecasts contain expected conditions over the
runway complex in regard to surface wind, visibility, weather and cloud.
To assist pilots with their flight planning, the Authority provides meteorological
briefings which are increasingly carried out using automated systems. Briefings
comprise details of en-route weather, upper winds and upper-air temperatures, often
given in the form of meteorological charts, warnings related to hazardous phenomena
en-route, and reports and forecasts for the destination aerodrome and its alternates.
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