UK CAA Part-145 SMS Implementation: What Every Approved Maintenance Organisation Must Do Before 1 July 2026

By Ferhan Bugay, Executive Director, Aero Support Group FZCO  |  30 March 2026

The clock is running. As of 30 March 2026, UK Part-145 approved maintenance organisations have exactly 93 days to implement a fully functioning Safety Management System (SMS) — or face losing their approval certificate. The UK Civil Aviation Authority has been unequivocal: on or after 1 July 2026, any maintenance organisation that has not closed its SMS implementation findings will be subject to revocation, suspension, or limitation of its Part-145 approval. This is not a warning — it is an enforcement position that is already active. For accountable managers, quality managers, and directors of UK-approved AMOs, the window for comfortable preparation is closed. The window for urgent action is now.

Background: How We Got Here

The requirement for UK Part-145 organisations to implement a formal Safety Management System was introduced by the Aviation Safety (Amendment) Regulation 2023 (SI 2023 No. 588), which came into force on 1 July 2024. This statutory instrument amended UK Regulation (EU) No 1321/2014, Annex II (Part-145), inserting a direct, enforceable obligation for all UK-approved maintenance organisations to establish and maintain an SMS as part of their management system.

The regulatory basis is not new in principle. ICAO Annex 19 (Safety Management, Edition 3) has long required SMS across aviation service providers, and EASA moved first — the equivalent EASA Part-145 SMS requirement entered into force in December 2024 for EASA-approved organisations. The UK CAA followed a parallel path, aligning UK requirements with the global safety management direction established by ICAO and mirrored by EASA, while setting its own specific transposition timeline and enforcement framework.

The UK CAA published CAP2998 — the Implementation Guide for the Introduction of Safety Management Systems into Part-145 Approvals — as the primary reference document. It covers the regulatory requirements, the approval process, and the evidence organisations are expected to provide. Crucially, it also specifies what the CAA will look for during oversight visits — and those visits are already happening.

What the SMS Requirement Actually Demands

The amended UK Part-145 regulation requires organisations to implement an SMS that is integrated with their existing management system — not bolted on as a separate document set. The SMS must address four core components aligned with ICAO Annex 19 and the broader international framework:

• Safety Policy and Objectives: A documented safety policy signed by the accountable manager, with clearly defined safety objectives, safety responsibilities, and accountability structures across the organisation.
• Safety Risk Management: A functioning process for hazard identification, risk assessment, and risk mitigation — including a maintained hazard log and risk register that reflects actual operational activities, not theoretical scenarios.
• Safety Assurance: A system for monitoring safety performance through Safety Performance Indicators (SPIs), internal safety auditing, safety data analysis, and management review. The SMS must demonstrate effectiveness, not just existence.
• Safety Promotion: Structured safety communication, training for all personnel on SMS roles and responsibilities, and a documented safety culture programme.

Importantly, the SMS must be reflected in the organisation’s Maintenance Organisation Exposition (MOE). The MOE will need to be updated to describe how SMS integrates with existing quality and compliance monitoring processes, how the Safety Manager role interfaces with the Accountable Manager and Quality Manager, and how the SMS operates in practice across all approved scopes of work.

The Enforcement Reality: What Happens After 1 July 2026

The UK CAA has stated its enforcement position in unambiguous terms. On or after 1 July 2026:

• Organisations that have not yet initiated SMS implementation will receive findings that cannot be left open — they will trigger immediate action.
• Organisations that have initiated but not completed implementation will be assessed against the evidence of progress. Partial implementation without a credible closure plan will not be accepted.
• Where implementation findings remain open past the deadline, the CAA is required to revoke, limit, or suspend the Part-145 approval certificate — in whole or in part.

This is a legal obligation for the CAA, not a discretionary enforcement decision. The consequence for a maintenance organisation is immediate: it cannot certify aircraft for return to service, it cannot operate under its approved scope, and its customers — airlines and operators — will need to find alternative approved maintenance providers. The commercial and reputational consequences of a revoked or suspended Part-145 approval are severe and potentially irreversible in the short term.

It is also worth noting that the CAA has confirmed there is currently no fee for incorporating SMS into an existing Part-145 approval. Organisations that engage with the process now face no financial barrier to compliance — only the cost of inaction.

What AMOs Must Do Right Now

For organisations that have not yet commenced or completed SMS implementation, the following steps are non-negotiable before 1 July 2026:

1. Conduct a formal SMS gap analysis against the amended UK Part-145 requirements and CAP2998. Identify what is in place, what is partially in place, and what is entirely missing. This is the starting point for every implementation plan.
2. Appoint a Safety Manager with clearly defined responsibilities, authority, and direct access to the Accountable Manager. The Safety Manager role must be documented in the MOE and communicated across the organisation.
3. Develop or update the SMS documentation — Safety Policy, Hazard Log, Risk Register, SPI framework, Safety Promotion Plan — and ensure these are operationally live, not just drafted documents.
4. Update the MOE to reflect the SMS structure, integration with the existing Compliance Monitoring System, and the specific roles and responsibilities of all SMS-accountable personnel.
5. Submit the SMS implementation to the UK CAA for review and approval. This requires formal engagement with the relevant CAA oversight team and may involve an oversight visit or documentation review before the finding can be closed.
6. Train all relevant personnel on SMS awareness, their specific roles within the SMS, and the hazard reporting process. Training records must be maintained as evidence of Safety Promotion compliance.

With 93 days remaining as of today, an organisation starting from zero faces a compressed but achievable timeline — provided it begins immediately and with structured external support where internal capacity is limited.

How Aero Support Group Can Help

Aero Support Group has supported numerous UK and EASA Part-145 organisations through SMS implementation programmes, from initial gap analysis to CAA submission and finding closure. Our approach is practical, regulator-focused, and designed to produce evidence-ready SMS documentation that meets the specific expectations of UK CAA oversight teams — not generic templates that fail at the oversight stage.

ASG’s SMS implementation support includes: formal gap analysis against CAP2998 and the amended UK Part-145 requirements, Safety Policy and SMS documentation development, MOE revision and integration, SPI framework design, Safety Manager coaching, and preparation of the full submission package for CAA review. We work to your timeline and prioritise the actions most likely to close findings before 1 July 2026.

Contact our team today to discuss your organisation’s implementation status and what needs to happen in the next 90 days.

Contact Aero Support Group: aerosupport360.com/contact  |  info@aerosupport360.com

Key Takeaways

• The UK CAA Part-145 SMS implementation deadline is 1 July 2026 — 93 days from 30 March 2026.
• Failure to comply will result in revocation, suspension, or limitation of the Part-145 approval certificate — a legal obligation for the CAA, not a discretionary decision.
• The SMS must be operationally integrated into the management system and reflected in the MOE — documentation alone is insufficient.
• There is currently no fee for incorporating SMS into an existing UK Part-145 approval.
• Organisations not yet compliant should begin an SMS gap analysis and CAA engagement immediately — the remaining timeline is compressed but achievable with structured support.

Frequently Asked Questions

What is the UK CAA Part-145 SMS deadline?

The mandatory deadline for all UK Part-145 approved maintenance organisations to implement a Safety Management System is 1 July 2026, as required by the Aviation Safety (Amendment) Regulation 2023 (SI 2023/588).

What happens if a Part-145 organisation misses the SMS deadline?

The UK CAA is legally required to revoke, suspend, or limit the Part-145 approval certificate of any organisation that has not closed its SMS implementation findings by 1 July 2026. This means the organisation cannot certify aircraft for return to service under its approved scope.

What does a UK Part-145 SMS need to include?

A compliant UK Part-145 SMS must cover four components aligned with ICAO Annex 19: Safety Policy and Objectives, Safety Risk Management (hazard log and risk register), Safety Assurance (SPIs, internal auditing, management review), and Safety Promotion (training and safety communication). It must also be reflected in the MOE.

Is there a cost to adding SMS to a UK Part-145 approval?

No. The UK CAA has confirmed there is currently no fee for incorporating SMS into an existing Part-145 approval. Organisations should engage with the CAA immediately to begin the implementation and approval process.

Where can I find the UK CAA guidance on Part-145 SMS implementation?

The primary guidance document is CAP2998 — the Implementation Guide for the Introduction of Safety Management Systems into Part-145 Approvals, published by the UK Civil Aviation Authority. It is available on the UK CAA website at caa.co.uk.

References

1. UK CAA Part-145 SMS Implementation Page: caa.co.uk/part-145-sms
2. Aviation Safety (Amendment) Regulation 2023 (SI 2023 No. 588): legislation.gov.uk
3. UK CAA CAP2998: caa.co.uk/CAP2998
4. ICAO Annex 19 — Safety Management (Edition 3): icao.int

dit Readiness

Aero Support Group (ASG) supports airlines, MROs, airports, ground handlers, and civil aviation authorities with practical implementation support across IOSA, ISAGO, EASA TCO, UK CAA TCO, EASA Part-145, Part-M / CAMO, ICAO USOAP, SMS, QMS, and regulatory compliance frameworks.

Our services include structured gap analysis, documentation review, audit preparation, corrective action planning, post-audit implementation support, safety intelligence integration, management system improvement, and regulator-ready compliance programme development.