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Appendix H to GM 21.A.101 Examples of documenting the proposed certification basis list

Available versions for ERULES-1963177438-4666

ED Decision 2017/024/R found in: Initial Airworthiness and Environmental Protection (No 748/2012) Part-21 Part-21L (Jul 2024)

Version Text

Appendix H to GM 21.A.101 Examples of documenting the proposed
certification basis list

ED Decision 2017/024/R

H.1    Example
1.

H.1.1 This optional tool may be used to establish
the applicable airworthiness and OSD certification specifications that will
become part of the type-certification basis for airworthiness or OSD certification
basis. For a significant change, the applicant must demonstrate compliance for
the change and the area affected by the change with the certification
specifications that were in effect at the date of application. However, in
some cases earlier or later certification specifications can be used, as
allowed in point [21.A.101](#_DxCrossRefBm1649096998).

H.1.2 In order to efficiently determine and agree
upon a certification basis with EASA, the following information is useful to
understand the applicant’s position:

H.1.2.1 The
scope of the change. This includes a high-level description of the physical
and functional changes and performance/functional characteristics, which are
changed as a result of the physical or functional change, and the
certification specifications for which compliance demonstration is required as
a result of the change.

H.1.2.2
The amendment level of all the applicable certification specifications at the
date of application.

H.1.2.3
The proposed certification basis, including amendment levels.

H.1.2.4
Applicants who propose a certification basis that includes amendment levels
earlier than what was in effect at the date of application should include the
exception as outlined in point [21.A.101](#_DxCrossRefBm1649096998) and their justification if needed.

H.1.3 Exceptions.

H.1.3.1 Unrelated
changes that are not significant (point [21.A.101](#_DxCrossRefBm1649096998)(b)(1)).

H.1.3.2
Not affected by the change (point [21.A.101](#_DxCrossRefBm1649096998)(b)(2)).

H.1.3.3
Compliance with the certification specification would not contribute
materially to the level of safety (point [21.A.101](#_DxCrossRefBm1649096998)(b)(3)).

H.1.3.4
Compliance with the certification specification would be impractical (point [21.A.101](#_DxCrossRefBm1649096998)(b)(3)).

H.1.4 One easy way to document the proposed
certification basis is using a tabular form as shown in Table below.

Table
H-1. Tabular Form for Documenting a Proposed Certification Basis

<table border="1" cellpadding="0" cellspacing="0">
<thead>
<tr>
<td rowspan="2" width="50">
CS
</td>
<td colspan="3" width="293">
Amendment Levels
</td>
<td rowspan="2" width="135">
Applicant Justification for
 Lower Amendment Level and Comments
</td>
<td rowspan="2" width="125">
Affected Area
</td>
</tr>
<tr>
<td width="98">
Existing TCDS Amendment
</td>
<td width="98">
Amendment at Date of Application
</td>
<td width="98">
Proposed Amendment Level
</td>
</tr>
</thead>
<tr>
<td colspan="6" width="603">
Subpart
 A — General
</td>
</tr>
<tr>
<td width="50">
</td>
<td width="98">
</td>
<td width="98">
</td>
<td width="98">
</td>
<td width="135">
</td>
<td width="125">
</td>
</tr>
<tr>
<td colspan="6" width="603">
Subpart B — Flight
</td>
</tr>
<tr>
<td width="50">
</td>
<td width="98">
</td>
<td width="98">
</td>
<td width="98">
</td>
<td width="135">
</td>
<td width="125">
</td>
</tr>
</table>

H.1.5 Best Practices.

H.1.5.1
Account for all certification specifications, even if they are not applicable.

H.1.5.2
Mark certification specifications that are not applicable as ‘N/A’.

H.1.5.3
If more than one amendment level is used depending on the area of the product,
list all areas and amendment levels at each area with proper justification.

H.1.5.4
If the justification is long, provide the justification below the table and
only place the certification specification reference and note in the comment
field.

H.1.5.5
Include airworthiness and OSD standards required by other EU regulations (e.g.
Part‑26) of affected areas.

H.2    Example
2.

Pages 129
through 135 of this Appendix contain another example for documenting a proposed
certification basis.

Title
of Design Change

Product
Name or Change to Type Certificate [XXXX]

Proposed
Certification Basis Pursuant to point 21.A.101

1.      INTRODUCTION.

1.1     REFERENCE DOCUMENTS.

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="161">
Reference
</td>
<td valign="top" width="402">
Title
</td>
</tr>
<tr>
<td valign="top" width="161">
[1]
 Point 21.A.101
</td>
<td valign="top" width="402">
Designation
 of applicable certification specifications and environmental protection
 requirements
</td>
</tr>
<tr>
<td valign="top" width="161">
[2]
 GM 21.A.101-1B
</td>
<td valign="top" width="402">
Establishing
 the Certification Basis of Changed Aeronautical Products
</td>
</tr>
<tr>
<td valign="top" width="161">
[3]
 XXXX
</td>
<td valign="top" width="402">
Application
 letter
</td>
</tr>
<tr>
<td valign="top" width="161">
[4]
 Type Certificate YYYY
</td>
<td valign="top" width="402">
Product
 type-certification basis
</td>
</tr>
<tr>
<td valign="top" width="161">
[5]
 Document ZZZZ
</td>
<td valign="top" width="402">
Certification
 plan
</td>
</tr>
<tr>
<td valign="top" width="161">
[6]
</td>
<td valign="top" width="402">
</td>
</tr>
</table>

1.2     ACRONYMS.

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="160">
Acronym
</td>
<td valign="top" width="402">
Meaning
</td>
</tr>
<tr>
<td valign="top" width="160">
AFM
</td>
<td valign="top" width="402">
Aircraft
 Flight Manual
</td>
</tr>
<tr>
<td valign="top" width="160">
AMC
</td>
<td valign="top" width="402">
Acceptable
 Means of Compliance
</td>
</tr>
<tr>
<td valign="top" width="160">
CRI
</td>
<td valign="top" width="402">
Certification
 Review Item
</td>
</tr>
<tr>
<td valign="top" width="160">
ELOS
</td>
<td valign="top" width="402">
Equivalent
 Level of Safety
</td>
</tr>
<tr>
<td valign="top" width="160">
ESF
</td>
<td valign="top" width="402">
Equivalent
 Safety Finding
</td>
</tr>
<tr>
<td valign="top" width="160">
GM
</td>
<td valign="top" width="402">
Guidance
 Material
</td>
</tr>
<tr>
<td valign="top" width="160">
MOC
</td>
<td valign="top" width="402">
Means
 of Compliance
</td>
</tr>
<tr>
<td valign="top" width="160">
SC
</td>
<td valign="top" width="402">
Special
 Condition
</td>
</tr>
<tr>
<td valign="top" width="160">
TC
</td>
<td valign="top" width="402">
Type
 Certificate
</td>
</tr>
</table>

1.3     PURPOSE OF THE DOCUMENT.

The purpose of this document is to propose
the certification basis applicable to [Product Design Change] in accordance
with point [21.A.101](#_DxCrossRefBm1649096998).

2.      DESIGN DEFINITION.

2.1     BASELINE PRODUCT.

The
type design to be changed, which is also known as the ‘baseline product,’ is
the Model Series\_\_\_ (this should be a specific product configuration, such as
a specific serial number or line number).

The
reference product certification basis is TCDS No. [XXXX], issued on [DATE].

2.2     DESIGN
CHANGE AND BASELINE PRODUCT COMPARISON SUMMARY.

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="303">
Specification
</td>
<td valign="top" width="129">
Model
 Series X
</td>
<td valign="top" width="129">
Model
 Series Y
</td>
</tr>
<tr>
<td valign="top" width="303">
Max
 Taxi Weight — MTW (lb)
</td>
<td valign="top" width="129">
A1
</td>
<td valign="top" width="129">
A2
</td>
</tr>
<tr>
<td valign="top" width="303">
Max
 Take-off Weight — MTOW (lb)
</td>
<td valign="top" width="129">
B1
</td>
<td valign="top" width="129">
B2
</td>
</tr>
<tr>
<td valign="top" width="303">
Max
 Landing Weight — MLW (lb)
</td>
<td valign="top" width="129">
C1
</td>
<td valign="top" width="129">
C2
</td>
</tr>
<tr>
<td valign="top" width="303">
Max Zero Fuel Weight — MZFW
 (lb)
</td>
<td valign="top" width="129">
D1
</td>
<td valign="top" width="129">
D2
</td>
</tr>
<tr>
<td valign="top" width="303">
Max
 Length (ft, in)
</td>
<td valign="top" width="129">
E1
</td>
<td valign="top" width="129">
E2
</td>
</tr>
<tr>
<td valign="top" width="303">
Max
 Height (ft, in)
</td>
<td valign="top" width="129">
F1
</td>
<td valign="top" width="129">
F2
</td>
</tr>
<tr>
<td valign="top" width="303">
Wing
 Span (ft, in)
</td>
<td valign="top" width="129">
G1
</td>
<td valign="top" width="129">
G2
</td>
</tr>
<tr>
<td valign="top" width="303">
Horizontal
 Tail Span (ft, in)
</td>
<td valign="top" width="129">
H1
</td>
<td valign="top" width="129">
H2
</td>
</tr>
<tr>
<td valign="top" width="303">
Fuel
 Capacity (gal)
</td>
<td valign="top" width="129">
I1
</td>
<td valign="top" width="129">
I2
</td>
</tr>
<tr>
<td valign="top" width="303">
Total
 Cargo Volume (ft3)
</td>
<td valign="top" width="129">
J1
</td>
<td valign="top" width="129">
J2
</td>
</tr>
<tr>
<td valign="top" width="303">
Max
 Passenger Limit — one class seating (occupants)
</td>
<td valign="top" width="129">
K1
</td>
<td valign="top" width="129">
K2
</td>
</tr>
<tr>
<td valign="top" width="303">
Engine
 Types
</td>
<td valign="top" width="129">
L1 &amp; M1
</td>
<td valign="top" width="129">
L2
</td>
</tr>
<tr>
<td valign="top" width="303">
Maximum
 Engine Thrust
</td>
<td valign="top" width="129">
T1
</td>
<td valign="top" width="129">
T2
</td>
</tr>
</table>

2.3     DESCRIPTION OF DESIGN
CHANGE, GROUPING AND CLASSIFICATION.

2.3.1  SIGNIFICANT CHANGE(S).

The following group of changes is proposed
as significant based on [GM 21.A.101‑1, Appendix A, ‘[Description of
Change in Appendix A]] or [the general configuration is not retained,
principles of construction are not retained, or assumptions for certification
of the product to be changed do not remain valid].

Changes Related to [Title
of Significant Change X]:

[Title of High-Level Change
C1]

The areas of physical change are:

—
[design change xx]

—
[design change yy]

—
[design change zz]

The areas unchanged but affected by the change
are:

—
[affected area aaa]

—
[affected area bbb]

—
[affected area ccc]

[Title of High-Level Change
C2]…

2.3.2  UNRELATED
NOT-SIGNIFICANT CHANGES.

[Title of High-Level Change
D1]. [Description].

[Title of High-Level Change
D2]. [Description]…

3.      IDENTIFICATION OF APPLICABLE CERTIFICATION STANDARDS.

3.1     PROPOSED
CERTIFICATION BASIS.

Based on the effective application date,
[date], under the provisions of [21.A.101](#_DxCrossRefBm1649096998),
the applicable certification standards for the [Title of Design Change] are
proposed as follows. The proposed certification basis includes exceptions to
earlier amendments (reversions), deviations, special conditions, and
equivalent (level of) safety findings.

3.1.1  Certification
specifications effective at the date of application.

Applicable certification specifications in
effect on the date of the application are:

Example for large aeroplanes:

A.      Airworthiness:

—
CS-25,

—
CS-AWO.

B.      Operational
Suitability Data:

—
CS-CCD,

—
CS-FCD,

—
CS-MCSD (to be published),

—
CS-MMEL,

—
CS-SIMD.

C.       Environmental
Protection:

—
CS-34,

—
CS-36.

3.1.2  Point
21.A.101 exception rationale.

The completed rationale for each does not
contribute materially to the level of safety (DCMLS) or impracticality exception
is provided in this section.

Exception 1: …

Exception 2: …

3.1.3  Optional
certification standards

Applicable certification specifications in
effect on the date of the application are:

Example for large aeroplanes:

—
CS 25.803, *Emergency
evacuation*, Amendment 12,

—
CS 25.1810, *Emergency
egress assisting means and escape routes*, Amendment 17.

3.1.4  Design-related
requirements from other aviation domains.

Applicable certification specifications in
effect on the date of the application are:

Example for large aeroplanes:

—
CS‑ACNS
Communications, Navigation and Surveillance

—
Initial Issue, dated 17 December 2013,
Subpart D Sections 2/3,

—
CS‑26.

3.1.5  Proposed
Special Conditions.

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="121">
Special
 Condition 
 (or TBD)
</td>
<td width="289">
Title
</td>
<td valign="top" width="113">
Effective
 Date 
 (or TBD)
</td>
</tr>
<tr>
<td valign="top" width="121">
</td>
<td valign="top" width="289">
</td>
<td valign="top" width="113">
</td>
</tr>
</table>

3.1.6  Equivalent
Safety Findings.

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="121">
ELOS
 Memo No 
 (or TBD)
</td>
<td width="218">
Title
</td>
<td width="184">
Applicable
 Standard
</td>
</tr>
<tr>
<td valign="top" width="121">
</td>
<td valign="top" width="218">
</td>
<td valign="top" width="184">
</td>
</tr>
</table>

3.1.7  Deviations.

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="122">
Deviation
 No 
 (or TBD)
</td>
<td width="151">
Title
</td>
<td width="137">
Applicable
 Standard
</td>
<td valign="top" width="113">
Date
 Issued 
 (or TBD)
</td>
</tr>
<tr>
<td valign="top" width="122">
</td>
<td valign="top" width="151">
</td>
<td valign="top" width="137">
</td>
<td valign="top" width="113">
</td>
</tr>
</table>

3.1.8  Elect
to comply

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td valign="top" width="121">
Elect
 to Comply No 
 (or TBD)
</td>
<td width="152">
Title
</td>
<td width="137">
Applicable
 Standard
</td>
<td valign="top" width="113">
Date
 Issued 
 (or TBD)
</td>
</tr>
<tr>
<td valign="top" width="121">
</td>
<td valign="top" width="152">
</td>
<td valign="top" width="137">
</td>
<td valign="top" width="113">
</td>
</tr>
</table>

Proposed Certification Basis

The certification basis is a complete
extract from the applicable FAA 14 CFR part [A] and it references the certification basis [B]. Column [C] identifies the
amendment level for the specific requirement on the date of application. The
changed product’s certification basis is proposed in last column [D]. References to FAR sections and amendments are kept.

Example for a Part 25 aeroplane:

<table border="1" cellpadding="0" cellspacing="0">
<tr>
<td width="87">
[A]
Requirement
</td>
<td width="95">
Title
(or
 subparagraph)
</td>
<td width="84">
[B] 
 Existing Certification Basis Amendment Level
</td>
<td width="84">
[C]
 Amendment Level on Application Date
</td>
<td width="84">
[D]
 Proposed Amendment for Changed Product
</td>
<td width="80">
Applicable
 Area
</td>
<td width="90">
Notes
</td>
</tr>
<tr>
<td rowspan="2" width="87">
25.25
</td>
<td colspan="6" width="516">
Weight limits
</td>
</tr>
<tr>
<td width="95">
</td>
<td width="84">
25-23
</td>
<td width="84">
25-63
</td>
<td width="84">
25-63
</td>
<td width="80">
Product
</td>
<td width="90">
</td>
</tr>
<tr>
<td rowspan="2" width="87">
25.33
</td>
<td colspan="6" width="516">
Propeller speed and pitch limits
</td>
</tr>
<tr>
<td width="95">
</td>
<td width="84">
N/A
</td>
<td width="84">
25-72
</td>
<td width="84">
N/A
</td>
<td width="80">
—
</td>
<td width="90">
Not
 applicable to Changed Product 
 (Jet Aircraft)
</td>
</tr>
<tr>
<td rowspan="3" width="87">
25.1309(a)
</td>
<td colspan="6" width="516">
Equipment, systems, and installations
</td>
</tr>
<tr>
<td width="95">
</td>
<td width="84">
25-41
</td>
<td width="84">
15-123
</td>
<td width="84">
25-123
</td>
<td width="80">
Changed
 and Affected Areas
</td>
<td width="90">
</td>
</tr>
<tr>
<td width="95">
</td>
<td width="84">
25-41
</td>
<td width="84">
25-123
</td>
<td width="84">
25-41
</td>
<td width="80">
Exception
 — Not Affected
</td>
<td width="90">
See
 example 1 in section 3.1.2
</td>
</tr>
<tr>
<td rowspan="2" width="87">
25.1703
</td>
<td colspan="6" width="516">
Function and installation: EWIS
</td>
</tr>
<tr>
<td width="95">
</td>
<td width="84">
N/A
</td>
<td width="84">
25-124
</td>
<td width="84">
N/A
</td>
<td width="80">
Exception
 — Product
</td>
<td width="90">
See
 example 2 in section 3.2.1
</td>
</tr>
</table>