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for a particular aircraft type by the organization responsible
for the type design with the approval of the State of Design
containing items, one or more of which is permined to be
unserviceable at the commencement of a flight. The
MMEL may be associated with special operating
conditions, limitations or procedures.
Maximum mass. Maximum certificated take-off mass.
Minimum descent &ude (MDA) or minimum descent
height (MDH). A specified altitude or height in a nonprecision
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
elevatwn 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 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/Hn.
Minimum equipment list (MEL). A list which provides for the
operation of aircraft, subject to specified conditions, with
particular equipment inoperative, prepared by an operator
in conformity with, or more restrictive than, the MMEL
established for the aircraft type.
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 6degrees
below the horizon.
Obstacle clearance altitude (OC4) or obstacle cleamnce
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 cleuance 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 non-precision approaches
to the aerodrome elevation or the threshold elevation i f that is
more than 2 m (7 f r ) bebw the aerodrome elevation. An
obstacle clearance height for a circling approach is
referenced to ihe aerodrome elevation.
Note 2.- For convenience when both expressions are used
they may be written in the form "obstacle clearance
altituMeight " and abbreviated "OCA/H".
Opemtional conkoL 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.
Operations manuaL A manual containing procedures,
instructions and guidance for use by operational personnel
in the execution of their duties.
Opemtor. A person, organization or enterprise engaged in or
offering to engage in an aircraft operation.
Opemtor's maintenance control manual. A document which
describes the operator's procedures necessary to ensure that
all scheduled and unscheduled maintenance is performed
on the operator's aircraft on time and in a controlled and
satisfactory manner.
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.
Pressure-altitude. An atmospheric pressure expressed in terms
of altitude which corresponds to that pressure in the
Standard Atmospheret.
Psychoactive substances. Alcohol, opioids, cannabinoids,
sedatives and hypnotics, cocaine, other psychostimulants,
hallucinogens, and volatile solvents, whereas coffee and
tobacco are excluded.
* As defined in Annex 8
No. 29
Chapter 1 Annex 6 - Operation of dircrafl
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