The End of ETOPS in Europe: What Comes Next

Extended Range Twin-engine Operations (ETOPS) has been one of the defining operational frameworks in modern aviation. For decades, it enabled twin-engine aircraft to safely operate long overwater and remote routes that were previously reserved for four-engine aircraft.

Today, however, ETOPS is about to disappear from EASA regulatory terminology. This change is being driven by EASA Notice of Proposed Amendment (NPA) 2025-12, which proposes to align regulations with ICAO SARPs. Not because the operational concept is being removed, but because it is about to be absorbed into a broader and more consistent framework: Extended Diversion Time Operations (EDTO),.

This change reflects an evolution in how aviation defines and manages operational risk.

From engine-based limits to diversion time risk

As discussed in a previous article on ETOPS history, the operational rule originally emerged as Extended-range Twin-engine Operations. Its foundation was simple: twin-engine aircraft were required to remain within a defined diversion time from a suitable alternate aerodrome, typically 60 minutes in early regulations.

At the time, this limitation reflected conservative assumptions about engine reliability, system redundancy, and operational risk exposure.

As turbine engine reliability improved and long-range twin-engine aircraft became standard, these limits were progressively extended under structured approval frameworks (120, 180 minutes and beyond).

However, as operations evolved, a fundamental limitation of ETOPS became clear: it was defined by aircraft configuration rather than operational risk exposure.

Modern long-range operations are no longer driven solely by engine count, but by multiple factors including:

• system reliability across electrical, fuel, navigation, and pressurisation systems

• availability of diversion aerodromes in remote regions

• risks such as fire, decompression, or medical emergencies

• extended exposure time over oceanic or polar routes

The central question shifted from:

How many engines does the aircraft have?

to:

How long is the aircraft exposed to diversion constraints?

Why ETOPS became conceptually fragmented

Over time, ETOPS terminology also became inconsistent in practice. Different authorities and operational contexts used it differently, creating conceptual fragmentation.

In Europe, this was further reflected in regulatory structure. While ETOPS was widely used for twin-engine operations, EASA introduced the Long-Range Operations (LROPS) concept to address extended-range operations by aircraft with three and four engines. This created a parallel framework alongside ETOPS, based on aircraft configuration rather than a unified operational principle.

In parallel, terminology diverged across other regulatory authorities as well. For example, the FAA redefined ETOPS as “Extended Operations,” broadening its interpretation beyond twin-engine aircraft while maintaining the underlying diversion-time principles. Although the operational intent remained broadly aligned, these differing definitions contributed further to inconsistency in how extended diversion operations were described globally.

Although these standards and regulatory frameworks address similar underlying risks, the separation reflects historical regulatory evolution rather than operational necessity.

This fragmentation highlighted the need for a more unified concept based on diversion time rather than aircraft type.

The ICAO shift: introducing EDTO

To address this, ICAO progressively evolved the ETOPS concept into Extended Diversion Time Operations (EDTO).

EDTO is defined as any operation where the diversion time to an en-route alternate aerodrome exceeds a threshold established by the State of the Operator.

This definition represents a significant conceptual shift.

EDTO:

• applies to all turbine-powered aircraft, not only twins

• focuses on time-based diversion exposure, not engine configuration

• integrates long-range operational risk under a single framework

Under EDTO, the emphasis moves away from aircraft classification and towards operational conditions that affect diversion safety.

In parallel, systems previously referred to as “ETOPS significant systems” remain central to approval, including propulsion, electrical power, fuel, navigation, and environmental systems.

The safety principle remains unchanged: ensure that an aircraft can safely continue or divert under extended exposure conditions.

EASA alignment and regulatory transition

The European regulatory framework is now aligning with ICAO Annex 6 Amendment 36 through EASA Notice of Proposed Amendment 2025-12.

This alignment introduces EDTO terminology into the regulatory structure and updates the associated Acceptable Means of Compliance, including:

• AMC 20-6B (ETOPS — extended-range operations with two-engine aeroplanes)

• Part-CAMO (continuing airworthiness management)

• Part-145 (maintenance organisation requirements)

This transition includes the relocation of Appendix 8 of AMC 20-6B on continuing airworthiness considerations into the relevant Part-CAMO and Part-145 AMCs, which specifically affect:

• Occurrence reporting

• Aircraft Maintenance Program (AMP) and Reliability Program

• Continuing Airworthiness Management Exposition (CAME)

• Competence of continuing airworthiness and maintenance personnel

Importantly, this is not a change in safety requirements or operational standards. It is a harmonisation of terminology and structure to reflect an already-evolved operational reality.

Conclusion

The transition from ETOPS to EDTO does not represent a change in operational safety principles, but a consolidation of how extended diversion risk is defined and regulated.

What began as a twin-engine operational limitation is now evolving into a unified, time-based framework that reflects the realities of modern long-range aviation.

For continuing airworthiness and maintenance organisations in Europe, these changes will be reflected in the corresponding updates to Part-CAMO and Part-145 AMCs, incorporating the applicable provisions currently contained in AMC 20-6B, which remain primarily applicable to extended-range operations with two-engine aeroplanes.

Learn more about maintenance requirements associated with ETOPS (EDTO) operational approvals →