Skip to content

A gradual release of Avioverse begins in October 2026. Request early access →

21L.B.101 Type-certification basis and applicable environmental protection requirements for a supplemental type certificate

Annex Ib · Regulation (EU) No 748/2012 · EAR revision 27 Nov 2025

IRImplementing rule

21L.B.101Type-certification basis and applicable environmental protection requirements for a supplemental type certificate

(a)The Agency shall establish the type-certification basis for a supplemental type certificate and notify it to the applicant.

(b)For major changes to a type certificate in the form of a supplemental type certificate, the type-certification basis for the areas affected by the change shall be that which is incorporated by reference in the type certificate, unless:

1.the Agency finds that the certification specifications referenced in the type certificate do not provide adequate standards with respect to the proposed change, therefore the change and the areas affected by the change shall also comply with any special conditions, and amendments to those special conditions, prescribed by the Agency in accordance with point 21L.B.44, to provide a level of safety equivalent to that established by the certification specifications applicable on the date of the application for the change;

2.an applicant chooses to comply with a certification specification set out in an amendment that is applicable on the date of the application for the change.

(c)The Agency shall designate the applicable environmental protection requirements for a major change to a type certificate in accordance with point 21.A.85 of Annex I (Part 21) and notify them to the applicant.

IR · 21L.B.101 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

All rules in SECTION B - PROCEDURES FOR COMPETENT AUTHORITIES

Consolidated from the EASA Easy Access Rules (revision 27 Nov 2025, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

Ask Metis about 21L.B.101 →

Metis opens with Avioverse in October 2026 · request early access.