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Appendix J to GM 21.A.101 Definitions and terminology

Available versions for ERULES-1963177438-4664

ED Decision 2019/018/R found in: Initial Airworthiness and Environmental Protection (No 748/2012) Part-21 Part-21L (Jul 2024)

Version Text

Appendix J to GM 21.A.101  Definitions
and terminology

ED Decision 2019/018/R

J.1     Aeronautical
product.

The terms
‘aeronautical product’ or ‘product’ used in this guidance material include
type-certified aircraft, engines, or propellers and, for the purpose of this
GM, an ETSOA’d APU.

J.2     Assumptions used for
certification.

The
assumptions used for certification are the evaluations and decisions that led
to the approval of the baseline product’s characteristics. Examples of the
product’s baseline characteristics include but are not limited to the
following:

—
Design methodologies, methods of compliance, and standards used to
achieve compliance with the certification specifications making up the
certification basis;

—
Structural, mechanical, electrical, propulsion, aerodynamic,
performance, operational, and maintenance characteristics;

—
Operational and flight envelopes defining the product performance and
capabilities at specified weights, speeds, altitudes, load factors, and
centres of gravity;

—
Crashworthiness;

—
Role or mission;

—
Airworthiness and operational limitations; or

—
Pilot training, if necessary.

J.3     Baseline product.

It is an
aeronautical product with a specific, defined approved configuration and
certification basis that the applicant proposes to change.

J.4     Certification basis.

The
combination of the:

—
airworthiness certification specifications as
provided for in point [21.B.80](#_DxCrossRefBm1649096853);

—
OSD certification specifications as provided
for in point [21.B.82](#_DxCrossRefBm1649096972); and

—
environmental protection requirements, as
provided for in point [21.B.85](#_DxCrossRefBm1649096971),

and as established for the
change according to point [21.A.101](#_DxCrossRefBm1649096998), as well as the:

—
special conditions;

—
equivalent safety findings;

—
elects to comply; and

—
deviations, applicable to the product to be certified.

J.5     Change.

The term
‘change’ refers to a change to a product type certificate (as defined in point [21.A.41](#_DxCrossRefBm1649097019)) approved or to be approved under Subpart D or Subpart E
(as a supplemental type certificate) of Part 21, including a change to an STC
or a change to the ETSOA for auxiliary power units (APUs) under Subpart O.
A change may consist of a single stand-alone change to one TC component or
several interrelated changes to different TC components (e.g. the type design,
operating characteristics, OSD, environmental protection characteristics, etc.
(see point [21.A.41](#_DxCrossRefBm1649097019) and [GM to 21.A.90A](#_DxCrossRefBm1649097030))).

J.6     Design change.

The term
‘design change’ refers to a change to the type design (as defined in point [21.A.31](#_DxCrossRefBm1649096925)) of an aeronautical product. In the context of this document, the
terms ‘change to the type design’, ‘modification’, ‘design change’, and ‘type
design change’ are synonymous.

J.7     Earlier standards.

The
certification specifications or previous standards in effect prior to the date
of application for the change, but not prior to the existing certification
basis.

J.8     Existing certification basis.

The
certification specifications or previous standards incorporated by reference
in the type certificate of the baseline product to be changed.

J.9     Latest standards.

The
certification specifications in effect on the date of application for the
change.

J.10   Previous relevant design changes.

Previous
design changes, the cumulative effect of which could result in a product
significantly or substantially different from the original product or model,
when considered from the last time the latest standards were applied.

J.11   Product-level change.

A change
or combination of changes that makes the product distinct from other models of
the product (e.g. range, payload, speed, design philosophy). Product-level
change is defined at the aircraft, aircraft engine, or propeller level of
change.

J.12   Secondary change.

A change
that is part of a significant physical change that does not contribute
materially to the level of safety. Guidance is contained in paragraph 3.10.1.4
of this GM.

J.13   Significant change.

A change
to the type certificate to the extent that it changes one or more of the
following, but not to the extent to be considered a substantial change: the
general configuration, principles of construction, or the assumptions used for
certification. The significance of the change is considered in the context of
all previous relevant design changes and all related revisions to the
applicable standards. Not all product-level changes are significant.

J.14   Significant change to area.

For
aircraft excepted under point [21.A.101](#_DxCrossRefBm1649096998)(c) only: a change to an area is
significant if the general configuration or the principles of construction in
that area are not retained, or the assumptions used for the certification of
that area do not remain valid.

J.15   Substantial change.

A change
that is so extensive that a substantially complete investigation of compliance
with the applicable certification basis is required, and consequently a new
type certificate is required pursuant to point [21.A.19](#_DxCrossRefBm1649096992).