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GM No 1 to 21.A.101(g) Establishment of the operational suitability data (OSD) certification basis for changes to type certificates (TCs)

Available versions for ERULES-1963177438-4240

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

Version Text

GM No 1 to 21.A.101(g) Establishment of the operational suitability
data (OSD) certification basis for changes to type certificates (TCs)

ED Decision 2019/018/R

This GM provides guidance on the application
of point [21.A.101](#_DxCrossRefBm1649096998)(g) in order to
determine the applicable OSD certification basis in accordance with points [21.A.101](#_DxCrossRefBm1649096998)(a), (b), (c), (d), (e) and (f) for
major changes to the OSD of type-certified aircraft.

1.       Minor changes

Minor
changes to the OSD are automatically outside the scope
of point [21.A.101](#_DxCrossRefBm1649096998). See GM 21.A.95 for
their certification basis.

2.       Major changes

a.       If the design change that
triggered the change to the OSD constituent is classified as non-significant,
the change to the OSD constituent is also non-significant.

b.       If
the design change that triggered the change to the OSD constituent is
classified as significant, the change to the OSD constituent should comply
with the latest amendment of the applicable CSs, unless the exceptions of [21.A.101](#_DxCrossRefBm1649096998)(b)(3) apply or unless the OSD
change can be classified as minor as per [21.A.91](#_DxCrossRefBm1649096897).
The guidance of [GM 21.A.101](#_DxCrossRefBm1649097047) Section 3.10
regarding the exceptions ‘impractical’ and ‘not contributing materially to the
level of safety’, can be applied by analogy and as far as it is applicable to
OSD changes.

c.       Stand-alone
changes to an OSD constituent are considered to be non-significant.

d.       When
a new OSD constituent is added or required to be added, it should comply with
the latest amendment of the applicable CSs.

e.       Reserved.

f.       Reserved.

g.       Point
[21.A.101](#_DxCrossRefBm1649096998)(c) provides an exception from
the requirements of [21.A.101](#_DxCrossRefBm1649096998)(a) for a
change to the OSD of certain aircraft below a specified maximum weight. If an
applicant applies for a change to the OSD for an aircraft (other than
rotorcraft) of 2 722 kg (6 000 lbs) or less maximum
weight, or for a non-turbine-powered rotorcraft of 1 361 kg (3 000
lbs) or less maximum weight, the applicant can demonstrate that the changed
OSD complies with the OSD certification basis incorporated by reference in the
TC. The applicant can also elect to comply, or may be required to comply, with
a later amendment. See also Chapter 4 Section 4.1 ([GM 21.A.101](#_DxCrossRefBm1649097047)) for specific guidance on this
requirement.

Note: Refer
to [GM No 1 to 21.A.15(d)](#_DxCrossRefBm1649096986) for the applicability
of the OSD to other-than-complex motor-powered aircraft.