ED Decision 2023/013/R
The intent of point 21L.A.252(c) is to prevent a part produced for a declared aircraft and produced under Subpart R from being installed on a type-certified aircraft particularly after a part has been maintained and subsequently released on an EASA Form 1.
To achieve this, the letter ‘R’ is added to the part number. The ICAs and parts catalogue should include an ‘R’ at the end of the part number that is assigned to the part.
If a part is similar to a part that is normally installed on a type-certified aircraft, it is expected that the ICAs and parts catalogue for the type-certified aircraft will include a part number that does not contain an ‘R’ at the end. Therefore, an installer would be prevented from installing a part with a part number ending in ‘R’ because the part number would not match the ICAs and parts catalogue for the type-certified aircraft.
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