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assessment of the a~rcraft position and rate of change of
position, in relation to tlze desiredflight path. In the case of a
circling approach tlze required visual reference is the runway
environment.
Note 3.- For convenience when both expressions are used
they may be wrifren in the form "nzinirncmz descent
altitude/heightfl and abbreviated "MDA/H".
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 6 degrees
below the horizon.
Obstacle clearance altitude (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 clearancc criteria.
Note I.- Obstacle clearance altitude is referenced to mean
sea level und obstncle clearance height is referenced to the
threshold elevatioiz or in the case of non-precision flpproaches
.to the aerodrome elevation or tlae threshold elevation if that is
more than 2 m (7 ft) below the aerodrome elevation. An
obstacle clearunce heiglzt for a circling approach is
referenced to the aerodrome elevation.
Note 2.- For conve~tierzce when both expressions are used
they may be written in the form "obstacle clearance
altitzrde/heighf" and abbreviated "OCA/H".
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 helicopter
performance, other operating limitations and relevant
expected conditions on the route to be followed and at the
heliports concerned.
Operations manual. A manual containing procedures,
instructions and guidance for usc hy operational personnel
in the execution of their duties.
Operator. A person, organization or enterprise engaged in or
offering to engage in an aircraft operation.
Operator's rnairzteriarrce control martual. 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 controllcd and
satisfactory manner.
Performance Class 1 helicopter. A helicopter with
performance such that, in case of critical power-unit failure,
it is able to land on the rcjcctcd take-off m a or safely
conhnuc the flight to an appropriate landing area,
depending on when the failure occurs.
Performance Class 2 helicopter. A helicopter with
performance such that, in case of critical power-unit failure,
it is able to safely continue the tlight, except when the
failure occurs prior to a defincd point after take-off or after
a defined point before landing, in which cases a forced
landing may be required.
Performance Chss 3 helicopter. A helicopter with
performance such that, in cast of power-unit failure at any
point in the flight profile, a forced landi'ng must be
performed.
Section I, Chapter I Annex 6 - Operatiort of Aircraft
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.
Psychoaclive 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
ajmorthy 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.
Note.- Navigation performance and requirem,en,ts are
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