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Minimum descent &ude (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 ( 7 3 ) 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 suficient time for the pilot to have made an
assessment of the aircraft 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 '*minimum descent
altitudeheight" and abbreviated "MDA.".
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 clearunce altitude (OCA) or obshle clearance
height (OCn). The lowest altitude or the lowest height
above the elevation of the relevant runway threshold
or the aerodrome elevation as applicable, used in estab
lishing compliance with appropriate obstacle clearance
criteria.
Note 1 .-- Obstacle clearance altitude is referenced to mean
sea level and obstacle clearance height is referenced to the
threshold elevation or in the case of nun-precision approaches
to the aerodrome elevation or the threshold elevation if that is
more than 2 m (7 ft) 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/Hm.
Pilot-in-command. The pilot responsible for the operation and
safety of the aircraft during flight time.
Psychoactive substances. Alcohol, opioids, cannabinoids,
sedatives and hypnotics, cocaine, other psychostimulants,
hallucinogens, and volatile solvents, whereas coffee and
tobacco are excluded.
Required navigation performance (RNP). A statement of the
navigation performance necessary for operation within a
defined airspace.
Note.- Navigation performance and requirements are
defined for a particular RNP type a d o r application.
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
pIus or minus 7.4 krn (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 Regktry. 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,
the States constituting the agency are jointly and severally
bobnd to assume the obligations which, under the Chicago
Convention, attach to a State of Registry. See, in this regard.
the Council Resolution of 14 December 1967 on Nationality
and Registration of Aircraft Operated by International
Operating Agencies (Doc 8722).
Visuul meteorological conditions (VMC). Meteorological
conditions expressed in terms of visibility, distance from
cloud, and ceiling, equal to or better than specified minima.
Note.- The specified minima are contained in Annex 2.
CHAPTER 2. APPLICAEILITY
The Standards and Recommended Practices contained in
Annex 6, Part II shall be applicable to international general
aviation operations with aeroplanes.
Note I.- Standards and Recommended Practices
applicable to the operation of aeroplanes by operators
authorized to conduct intermtio'ml commercial air transport
operations are to be found in Annex 6, Part I.
　
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