What requirement applies to an approved repair design issued before the fatigue- and damage-tolerance evaluation has been completed?

Such an approved design should specify the limited service period.

GM1 21L.A.209(b) Approval of a repair design under a privilege

Q: When a DOA holder approves a repair design under its privilege, how is the approval documented and what is EASA's role?

The DOA holder issues the approval without EASA's involvement, and the repair release documentation should clearly show that the approval is issued on the basis of its privilege. EASA monitors the application of this procedure within the surveillance plan for the relevant organisation.

Q: What conditions must be met to reuse previously approved repair data for a new damage case?

An appropriately approved design organisation must have checked the applicability and effectiveness of the data. The solution may be considered approved and used again if, after damage identification, a repair solution exists in the available approved data, and the application of this solution to the identified damage remains justified by the previously approved repair design (structural justifications still valid, possible airworthiness limitations unchanged).

Q: How should temporary repairs be classified and what must be defined at the time of their approval?

Temporary repairs should be classified under point 21L.A.203, and the service period should be defined when the temporary repair is approved.

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GM1 21L.A.209(b) Approval of a repair design under a privilege

ED Decision 2023/013/R

REPAIR DESIGN APPROVAL BY A DESIGN ORGANISATION APPROVAL (DOA) HOLDER

(a) Approval by a DOA holder

The approval of repairs through the use of procedures agreed with EASA implies that the DOA holder issues the approval without EASA’s involvement. EASA will monitor the application of this procedure within the surveillance plan for the relevant organisation. When the organisation exercises this privilege, the repair release documentation should clearly show that the approval is issued on the basis of its privilege.

(b) Previously approved data for other applications

When it is intended to use previously approved data for other applications, it is expected that an appropriately approved design organisation has checked the applicability and effectiveness of this data. After damage identification, if a repair solution exists in the available approved data, and if the application of this solution to the identified damage remains justified by the previously approved repair design (structural justifications still valid, possible airworthiness limitations unchanged), the solution may be considered approved and may be used again.

These are life-limited repairs to be removed and replaced by permanent repairs after a limited service period. These repairs should be classified under point 21L.A.203, and the service period should be defined when the temporary repair is approved.

(d) Fatigue and damage tolerance

An approved design issued before the fatigue- and damage-tolerance evaluation has been completed should specify the limited service period.

Details

Source-Title: GM1 21L.A.209(b) Approval of a repair design under a privilege View latest amendments

Erulesid: ERULES-1963177438-22039 Compare versions

Domain: Initial airworthiness

Amendedby: Issue 1

Applicabilitydate: 21 October, 2023

Entryintoforcedate: 21 October, 2023

Regulatorysource: ED Decision 2023/013/R Navigate

Regulatorysubject: Part 21 Light

Typeofcontent: GM to IR (Guidance material to implementing rule)

Parentir: 21L.A.209 Approval of a repair design under a privilege

Origin: EASA

Category: EAR