---
title: "21L.B.44 Special conditions — Annex Ib, Initial Airworthiness · Avioverse"
description: "The Agency shall prescribe special detailed technical specifications, named ‘special conditions’, for a product if the related certification…"
url: "https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-b-procedures-for-competent-authorities/21l-b-44"
---

# 21L.B.44 Special conditions

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

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-initial-airworthiness-and-environmental) · [EUR-Lex 2012/748 (opens in a new tab)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32012R0748)

IR Implementing rule

## 21L.B.44 Special conditions

(a) The Agency shall prescribe special detailed technical specifications, named ‘special conditions’, for a product if the related certification specifications do not contain adequate or appropriate safety standards for the product because:

1\. the product has novel or unusual design features relative to the design practices on which the applicable certification specifications are based;

2\. the intended use of the product is unconventional; or

3\. experience from other similar products in service or products having similar design features or newly identified hazards have shown that unsafe conditions may develop.

(b) Special conditions contain such safety standards as the Agency finds necessary in order to establish a level of safety equivalent to that of the applicable certification specifications.

IR · 21L.B.44 — Regulation (EU) No 748/2012 · Regulation (EU) 2022/1358 · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

GM Guidance material

## GM1 21L.B.44 Special conditions

GENERAL

The term ‘novel or unusual design features’ should be judged in view of the applicable certification basis for a particular product. A design feature, in particular, should be judged to be a ‘novel or unusual design feature’ when the certification basis does not sufficiently cover it.

The term ‘unsafe condition’ is used with the same meaning as described in AMC1 21L.B.23(b) ‘Airworthiness directives’.

The term ‘newly identified hazards’ is intended to address new risks that may be recognised in the design (e.g. questionable features) or its operational characteristics (e.g. volcanic ash) for which there is not yet enough in-service experience.

GM · GM1 21L.B.44 — Regulation (EU) No 748/2012 · ED Decision 2023/013/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025

[All rules in SECTION B - PROCEDURES FOR COMPETENT AUTHORITIES](https://avioverse.aero/regulations/easa/initial-airworthiness/annex-ib/section-b-procedures-for-competent-authorities)

Consolidated from the EASA Easy Access Rules (revision 27 Nov 2025, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.