Can residual strength loads for changes to the FCS be based on the original certification basis fail-safe load cases?

Yes, for aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or earlier amendments, residual strength loads may be based upon the fail-safe load cases of the original certification basis.

What is the applicability of CS 26.307(a)(iii) and (c) regarding damage tolerance data for existing changes to the FCS?

The section applies to existing changes to the flight control system (FCS) and requires compliance with the fatigue and damage tolerance evaluation as specified, either by complying with CS 25.571 Amendment 19 or later, or by following the alternative provisions in CS 26.307(a) and (b).

What is the exception in CS 26.307(b) regarding residual strength loads?

The exception is that for aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or earlier amendments, residual strength loads may be based upon the fail-safe load cases of the original certification basis.

Which amendment of CS 25.571 is referenced as an acceptable compliance method for CS 26.307(a)(iii) and (c)?

CS 25.571 Amendment 19 or subsequent amendment is referenced as an acceptable compliance method.

What is the source of the compliance requirements in CS 26.307(a)(iii) and (c)?

The source is Decision 2020/023/R, and the section is part of EASA Easy Access Rules for Part-26, issue 26/3.

What is the title of CS 26.307(a)(iii) and (c)?

The title is 'Damage tolerance data for existing changes to the FCS.'

What does 'FCS' stand for in CS 26.307?

FCS stands for Flight Control System.

Is compliance with CS 25.571 Amendment 19 mandatory for all aeroplanes under CS 26.307(a)(iii) and (c)?

No, it is one option. Alternatively, compliance can be demonstrated by following the provisions in CS 26.307(a) and (b).

What is the effect of point (b) on the evaluation for aeroplanes with earlier certification bases?

Point (b) requires that the evaluation be in accordance with later amendments (JAR-25 Change 7 or 14 CFR §25.571 Amendment 45 or equivalent, or later), but allows residual strength loads to be based on the original certification basis fail-safe load cases.

What is the publication date of the EASA Easy Access Rules section containing CS 26.307(a)(iii) and (c)?

The publication date is 2026-04-30.

Does CS 26.307(a)(iii) and (c) specify an applicability date on or after 2026-04-30?

No, the section does not state an applicability date.

What is the significance of 'equivalent' in CS 26.307(b)?

It allows the use of equivalent standards to JAR-25 Change 7 or 14 CFR §25.571 Amendment 45, or later amendments, for the fatigue and damage tolerance evaluation.

CS 26.307(a)(iii) and (c) Damage tolerance data for existing changes to the FCS

Q: How can compliance with the fatigue and damage tolerance evaluation required by CS 26.307(a)(iii) and (c) be demonstrated?

Compliance can be demonstrated by complying with CS 25.571 Amendment 19 or subsequent amendment, or with the alternative provisions in CS 26.307(a) and (b).

Q: What are the alternative compliance methods for CS 26.307(a)(iii) and (c) fatigue and damage tolerance evaluation?

The alternatives are: (a) the evaluation is in accordance with the damage tolerance requirements of the applicable certification basis, except as provided in point (b); or (b) for aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or earlier amendments, the evaluation is in accordance with JAR-25 Change 7 or 14 CFR §25.571 Amendment 45, or equivalent, or later amendments, except that residual strength loads may be based upon the fail-safe load cases of the original certification basis.

Q: For aeroplanes certified under JAR-25 Change 6 or 14 CFR §25.571 Amendment 44, what standard applies to the fatigue and damage tolerance evaluation of changes?

The evaluation must be in accordance with JAR-25 Change 7 or 14 CFR §25.571 Amendment 45, or equivalent, or later amendments, except that residual strength loads may be based upon the fail-safe load cases of the original certification basis.

Q: What does CS 26.307(a) require for the fatigue and damage tolerance evaluation of changes to the FCS?

CS 26.307(a) requires that the fatigue and damage tolerance evaluation is in accordance with the damage tolerance requirements of the applicable certification basis, except as provided in point (b) of that CS.

Q: For aeroplanes with an earlier certification basis than JAR-25 Change 6 or 14 CFR §25.571 Amendment 44, what standard applies?

The fatigue and damage tolerance evaluation must be in accordance with JAR-25 Change 7 or 14 CFR §25.571 Amendment 45, or equivalent, or later amendments, with the same residual strength loads exception.

Q: Does CS 26.307 allow the use of the original certification basis for residual strength loads?

Yes, but only for aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or earlier amendments, and only for residual strength loads based on fail-safe load cases.

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CS 26.307(a)(iii) and (c) Damage tolerance data for existing changes to the FCS

ED Decision 2020/023/R

Compliance with the fatigue and damage tolerance evaluation required by point 26.307 (a)(iii) and (c) of Part-26 is demonstrated by complying with CS 25.571 Amendment 19 or subsequent amendment, or with the following:

(a) The fatigue and damage tolerance evaluation is in accordance with the damage tolerance requirements of the applicable certification basis, except as provided in point (b) of this CS.

(b) For aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or earlier amendments, the fatigue and damage tolerance evaluation of the change is in accordance with JAR-25 Change 7 or 14 CFR §25.571 Amendment 45, or equivalent, or later amendments, except that residual strength loads may be based upon the fail-safe load cases of the original certification basis.

[Issue: 26/3]

Details

Source-Title: CS 26.307(a)(iii) and (c) Damage tolerance data for existing changes to the FCS View latest amendments

Erulesid: ERULES-1963177438-17997 Compare versions

Domain: Additional airworthiness specifications

Amendedby: CS Issue 3

Applicabilitydate: 18 December, 2020

Entryintoforcedate: 18 December, 2020

Regulatorysource: ED Decision 2020/023/R Navigate

Regulatorysubject: Part-26, CS-26

Typeofcontent: CS (Certification specification)

Parentir: 26.307 Damage tolerance data for existing changes to fatigue-critical structure

Origin: EASA

Category: EAR