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International airways volcano watch ( I A W . International
arrangements for monitoring and providing warnings to
aircraft of volcanic ash in the atmosphere.
Note.- The IAVW is based on the cooperation of aviation
and non-aviation operational units using information derived
fi.om observing sources and networks that are provided by
States. The watch is coordinated by ZCAO with the cooperation
of other concerned international organizations.
Level. A generic term relating to vertical position of an aircraft
in flight and meaning variously height, altitude or flight
level.
Meteorological authority. The authority providing or
arranging for the provision of meteorological service for
international air navigation on behalf of a Contracting
State.
Meteorological bulletin. A text comprising meteorological
information preceded by an appropriate heading.
Meteorological information. Meteorological report, analysis,
forecast, and any other statement relating to existing or
expected meteorological conditions.
Meteorological ofice. An office designated to provide
meteorological service for international air navigation.
Meteorological report. A statement of observed meteorological
conditions related to a specified time and location.
Meteorological satellite. An artificial Earth satellite making
meteorological observations and transmitting these
observations to Earth.
Minimum sector altitude. The lowest altitude which may be
used which will provide a minimum clearance of 300 m
(1 000 fl) above all objects located in the area contained
within a sector of a circle of 46 km (25 NM) radius centred
on a radio aid to navigation.
Observation (meteorological). The evaluation of one or more
meteorological elements.
Operational control. The exercise of authority over the
initiation, continuation, diversion or termination of a flight
in the interest of the safety of the aircraft and the regularity
and efficiency of the flight.
Operational flight plan. The operator's plan for the safe
.conduct of the flight based on considerations of aeroplane
performance, other operating limitations and relevant
expected conditions on the route to be followed and at the
aerodromes concerned.
Operationalplanning. The planning of flight operations by an
operator.
Operator. A person, organization or enterprise engaged in or
offering to engage in an aircraft operation.
Pilot-in-command The pilot designated by the operator, or in
the case of general aviation, the owner, as being in
command and charged with the safe conduct of a flight.
Prevailing visibility. The visibility value, observed in accordance
with the definition of %isibility", which is reached or
exceeded within at least half the horizon circle or within at
least half of the surface of the aerodrome. These areas
could comprise contiguous or non-contiguous sectors.
Note.- This value may be assessed by human observation
andor instrumented systems. When instruments are installed,
they are used to obtain the best estimate of the prevailing
visibility.
Prognostic chart. A forecast of a specified meteorological
element(s) for a specified time or period and a specified
surface or portion of airspace, depicted graphically on a
chart.
Qualify assurance. All the planned and systematic activities
implemented within the quality system, and demonstrated
as needed, to provide adequate confidence that an entity
will fulfil requirements for quality (IS0 9000:2000*).
Quality control. The operational techniques and activities that
are used to fulfil requirements for quality
(IS0 9000:2000*).
Quality management. All activities of the overall management
function that determine the quality policy, objectives and
responsibilities, and implementing them by means such as
quality planning, quality control, quality assurance and
quality improvement within the quality system
(IS0 9000:2000*).
* IS0 Standard 9000:2000 - Quality Management Systems -
Fundamentab and Vocabulary.
Annex 3 - Meteorological Service for Internationd Air Navigation Chapter 1
Qudity system. The organizational structure, procedures, Tropical cyclone advisory centre (TCAC). A meteorological
processes and resources needed to implement quality centre designated by regional air navigation agreement to
management (IS0 9000:2000*). provide advisory informati0.n to meteorological watch
offices, world area forecast centres and international
Regiond air navigation agreement. Agreement approved by OPMET data banks regarding the position, forecast
the Council of ICAO normally on the advice of a regional direction and speed of movement, central pressure and
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