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commercial air transport operation or an aerial work
operation.
Helicopter. A heavier-than-air aircraft supported in flight
chiefly by the reactions of the air on one or more powerdriven
rotors on substantially vertical axes.
Helideck. A heliport located on a floating or fixed off-shore
structure.
Heliport. An aerodrome or a defined arca on a structure
intended to be used wholly or in part for the arrival,
departure and surface movement of helicopters.
Heliport operating minima. The limits of usability of a
heliport for:
a) take-off. expressed in terms of runway visual range
andlor visibility and, if necessary, cloud conditions:
b) landing in precision approach and landing operations,
expressed in terms of visibility and/or runway visual
range and decision altitudelheight (DA/H) as appropriate
to the category of the operation;
C) landing in approach and landing operations with vertical
guidance, expressed in terms of visibility and/or runway
visual range and decision altitudelheight (DAIH); and
d) landing in non-precision approach and landing
operations, expressed in terms of visibility and/or
runway visual range, minimum descent altitudelheight
(MDAIH) and, if necessary, cloud conditions.
Human Factors principles. Principles which apply to
aeronautical design, certification, training, operations and
maintenance and which seek safe interface between the
human and other system components by proper
consideration to human performance.
Human performance. Human capabilities and limitations
which have an impact on the safety and efficiency of
aeronautical operations.
Instrument meteorological conditions (IMC). Meteorological
conditions expressed in terms of visibility, distance fmm
cloud, and ceiling*, less than the minima specified for
visual meteorological conditions.
Note.- The spectfied minima for visual meteorological
conditions are contained in Chapter 4 of Annex 2.
Landing deckion point (LDP). The point used in determining
landing performance from which, a powe'r-unit failure
occurring at this point, the landing Inay be safely continued
or a balked landing initiated.
Note.- LDP applies to perfnnnance Class 1 helicopters.
Maintenance. The performance of tasks required to ensure the
continuing airworthiness of an aircraft, including any one or
combination of overhaul, inspection, replacement, defect
rectification, and the embodiment of a modification or
repair.
Maintenance programme. A document which describes the
specific scheduled maintenance tasks and their frequency of
completion and related procedures, such as a reliability
programme, necessary for the safe operation of those
aircraft to which it applies.
Mm'ntenance orgarlization's procedures manual. A document
endorsed by the head of the maintenance organization
which details the maintenance organization's structure and
* As defined in Anncx 2.
Aniiex 6 - Operation of Aircraft Part I11
management responsibilities, scope of work, description of
facilities, maintenance procedures and quality assurance or
inspection systcms.
Maintenance release. A document which conlains 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.
Master minimum equipment list (MMEL). A list established
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 permitted to be
unserviceable at the commence~nent of a flight. Thc
MMEL may be associated with special operating conditions,
limitations or procedures.
Maximum mass. Maximum certificated take-off mass
Minimum descent altitude (MDA) or minimum descent height
(MDH). A specifjed altitude or hdght in a non-precision
approach or circling approach below which desccnt must
not be made without the required visual reference.
Note I.- Minlmum descent altitude (MDA) is referenced fo
niean sea level and minimunz descent height (MDH) is
referenced to the aerodrome elevation or to the threshold
elevation if that is nzore than 2 nz (7ft) helow the nerodrome
elevation. A minimum descen,t height for a circling approach
is referenced to the nerodro~ne elevation.
Note 2.- The req~~imvdis ual reference nzeans that section
of the visual aids or of tlze approach area which should have
been rn vrew for srrfJiclent time jor the pilot to have made an
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