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aircraft to which it applies.
Maintenance release. A document which contains a
certification confirming that the maintenance work to which
it relates has been completed in a satisfactory manner,
either in accordance with the approved data and the
procedures described in the maintenance organization's
procedures manual or under an equivalent system.
Meteorological information. Meteorological report, analysis,
forecast, and any other statement relating to existing or
expected meteorological conditions.
Minimum descent altihrde (MDA) or minimum descent height
(MDH). A specified altitude or height in a non-precision
approach or circling approach below which descent must not
be made without the required visual reference.
Note 1.- Minimum descent altitude (MDA) is referenced to
mean sea level and minimum descent height (MDH) is
referenced to the aerodrome elevation or to the threshold
elevation if that is more than 2 m (7fr) below the aerodrome
elevation. A minimum descent height for a circling approach
is referenced to the aerodrome elevation.
Note 2.- The required visual reference means that section
of the visual aids or of the approach area which should have
been in view for sufSicient time for the pilot to have made an
assessment of the aircrafr position and rate of change of
position, in relation to the desiredflight path. In the case of a
circling approach the required visual reference is the runway
environment.
Note 3.- For convenience when both expressions are used
they may be written in the form "minimwn descent
altitudeheight" and abbreviated "MDA/HW.
Night. The hours between the end of evening civil twilight and
the beginning of morning civil twilight or such other period
between sunset and sunrise, as may be prescribed by the
appropriate authority.
Note.- Civil twilight ends in the evening when the centre
of the sun's disc is 6 degrees below the horizon and begins in
the morning when the centre of the sun's disc is 6 degrees
below the horizon.
Obstacle clearance altihrde (OCA) or obstacle clearance
height (OCH). The lowest altitude or the lowest height
above the elevation of the relevant runway threshold
or the aerodrome elevation as applicable, used in establishing
compliance with appropriate obstacle clearance
criteria.
Note I.- Obstacle clearance altitude is referenced to mean
sea level and obstacle clearance height is referenced to the
threshold elevation or in the case of non-precision approaches
to the aerodrome elevation or the threshold elevation if that is
more than 2 m (7 fr) below the aerodrome elevation. An
obstacle clearance height for a circling approach is
referenced to the aerodrome elevation.
Note 2.- For convenience when both expressions are used
they may be written in the form "obstacle clearance
altitudeheight" and abbreviated "OCA/H".
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.
Psychoactive substances. Alcohol, opioids, cannabinoids,
sedatives and hypnotics, cocaine, other psychostimulants,
hallucinogens, and volatile solvents, whereas coffee and
tobacco are excluded.
Repair. The restoration of an aeronautical product to an
airworthy condition to ensure that the aircraft continues to
comply with the design aspects of the appropriate
airworthiness requirements used for the issuance of the type
certificate for the respective aircraft type, after it has been
damaged or subjected to wear.
Required navigation performance (RNP). A statement of the
navigation performance necessary for operation within a
defined airspace.
*As defined in Annex 2.
Note.- Navigation performance and requirements are
defined for a particular RNP type a d o r application.
VIM1
No. 21
Annex 6 - Operation of Aircraft Part ZZ
RNP type. A containment value expressed as a distance in
nautical miles from the intended position within which flights
would be for at least 95 per cent of the total flying time.
Example.- RNP 4 represents a navigation accuracy of
plus or minus 7.4 km (4 NM) on a 95 per cent containment
basis.
Runway visual range (RVR). The range over which the pilot
of an aircraft on the centre line of a runway can see the
runway surface markings or the lights delineating the
runway or identifying its centre line.
State of Registry. The State on whose register the aircraft is
entered.
Note.- In the case of the registration of aircraft of an
international operating agency on other than a national basis,
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