---
title: "Operation in performance class 1 — EASA Definition · Avioverse"
description: "Article 2, Regulation (EU) No 965/2012: ‘operation in performance class 1’ means an operation that, in the event of failure of the critical engine, the…"
url: "https://avioverse.aero/glossary/easa/operation-in-performance-class-1"
---

# operation in performance class 1

EASA defines “operation in performance class 1” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

> ‘operation in performance class 1’ means an operation that, in the event of failure of the critical engine, the helicopter is able to land within the rejected take-off distance available or safely continue the flight to an appropriate landing area, depending on when the failure occurs;

Article 2 · Air Operations · Regulation (EU) No 965/2012 · Easy Access Rules, 27 Mar 2026 revision · [Read Article 2](https://avioverse.aero/regulations/easa/air-ops/cover-regulation/powers-and-recitals#article-2)

## Defined in the same article

- [aeroplane](https://avioverse.aero/glossary/easa/aeroplane)
- [balloon](https://avioverse.aero/glossary/easa/balloon)
- [competition flight](https://avioverse.aero/glossary/easa/competition-flight)
- [flying display](https://avioverse.aero/glossary/easa/flying-display)
- [gyroplane](https://avioverse.aero/glossary/easa/gyroplane)
- [helicopter](https://avioverse.aero/glossary/easa/helicopter)
- [high risk commercial specialised operation](https://avioverse.aero/glossary/easa/high-risk-commercial-specialised-operation)
- [innovative air mobility (IAM) operations](https://avioverse.aero/glossary/easa/innovative-air-mobility-operations)