What are the two acceptable paths for the fatigue and damage tolerance evaluation of a change or repair under CS 26.333 and 26.334?

The two acceptable paths are: (1) complying with CS 25.571 Amendment 19 or later; or (2) following the alternative provisions in CS 26.333 and 26.334, which require the evaluation to be accomplished in accordance with the damage tolerance requirements of the applicable certification basis or a later amendment, with a special rule for older certification bases as described in point (b).

For an aeroplane originally certified to JAR-25 Change 6, what amendment level must the fatigue and damage tolerance evaluation of a repair meet under CS 26.333(b)?

For aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or an earlier amendment, the evaluation must be accomplished in accordance with JAR-25 Change 7 or 14 CFR §25.571 Amendment 45, or equivalent, or later amendments.

Under CS 26.333(b), can residual strength loads for a repair on an older aeroplane be based on the original certification basis?

Yes, residual strength loads may be based upon the fail-safe load cases of the original certification basis, even though the rest of the evaluation must follow the later amendment (e.g., JAR-25 Change 7 or 14 CFR §25.571 Amendment 45).

What is the exception in CS 26.333(b) regarding residual strength loads?

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

What is the relationship between CS 26.333/26.334 and CS 25.571 Amendment 19?

Compliance with the fatigue and damage tolerance evaluation required by CS 26.333(a)(i) or 26.334(a)(i) is demonstrated by complying with CS 25.571 Amendment 19, or subsequent amendment, or with the alternative provisions in CS 26.333 and 26.334.

What does 'equivalent' mean in the context of CS 26.333(b) when referring to JAR-25 Change 6 or 14 CFR §25.571 Amendment 44?

The text states 'JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or an earlier amendment' – 'equivalent' refers to a certification basis that is equivalent to those specified amendments, but the section does not define the term further.

Can the fatigue and damage tolerance evaluation under CS 26.333 be based on the original certification basis without any later amendment?

Yes, under point (a), the evaluation can be accomplished in accordance with the damage tolerance requirements of the applicable certification basis, unless point (b) applies. Point (b) requires a later amendment for older certification bases, but point (a) generally allows the original basis.

What is the effect of point (b) on the general rule in point (a) of CS 26.333?

Point (b) provides an exception to point (a) for aeroplanes certified to JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or earlier: for those aeroplanes, the evaluation must use a later amendment (JAR-25 Change 7 or 14 CFR §25.571 Amendment 45 or later), except for residual strength loads which may be based on the original fail-safe load cases.

What is the scope of CS 26.333 and 26.334?

The scope is 'Damage tolerance data for STCs, other changes and repairs to those STCs and changes' – it applies to the fatigue and damage tolerance evaluation required by points 26.333(a)(i) or 26.334(a)(i) of Part-26.

Can residual strength loads be based on the original certification basis for an aeroplane certified to JAR-25 Change 8?

No, because point (b) only applies to aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or an earlier amendment. For JAR-25 Change 8, point (a) would apply, and the evaluation would follow the applicable certification basis or a later amendment, without the specific residual strength exception.

What does 'fail-safe load cases' refer to in CS 26.333(b)?

The text states that residual strength loads may be based upon the fail-safe load cases of the original certification basis, but it does not define 'fail-safe load cases' further; it is a term from the original certification basis.

Is there an applicability date mentioned in CS 26.333 and 26.334?

No, the section text does not include an applicability date.

CS 26.333 and 26.334 Damage tolerance data for STCs, other changes and repairs to those STCs and changes

Q: How can an STC holder demonstrate compliance with the fatigue and damage tolerance evaluation required by CS 26.333(a)(i) or CS 26.334(a)(i)?

Compliance is demonstrated by complying with CS 25.571 Amendment 19, or subsequent amendment, or with the alternative provisions in CS 26.333 and 26.334: (a) the evaluation is accomplished in accordance with the damage tolerance requirements of the applicable certification basis or a later amendment, except as provided in point (b); (b) for aeroplanes certified on the basis of JAR-25 Change 6 or 14 CFR §25.571 Amendment 44 or equivalent, or an earlier amendment, the evaluation is accomplished 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: Does CS 26.333 allow the fatigue and damage tolerance evaluation to use a later amendment than the applicable certification basis?

Yes, point (a) of CS 26.333 allows the evaluation to be accomplished in accordance with the damage tolerance requirements of the applicable certification basis or a later amendment, except as provided in point (b).

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CS 26.333 and 26.334 Damage tolerance data for STCs, other changes and repairs to those STCs and changes

ED Decision 2020/023/R

Compliance with the fatigue and damage tolerance evaluation required by points 26.333(a)(i) or 26.334(a)(i) 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 accomplished in accordance with the damage tolerance requirements of the applicable certification basis or a later amendment, 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 an earlier amendment, the fatigue and damage tolerance evaluation of the change or repair is accomplished 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 26.333 and 26.334 Damage tolerance data for STCs, other changes and repairs to those STCs and changes View latest amendments

Erulesid: ERULES-1963177438-18002 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: 26.334 Damage tolerance data for STCs and other existing major changes and repairs affecting those STCs or changes approved before 1 September 2003

Origin: EASA

Category: EAR