Airline Operations Manual Suite

OM-A, OM-B, OM-C & OM-D Development, Revision & Authority Acceptance for Commercial Air Transport Operators

The airline operations manual suite is the central regulatory document of a commercial air transport operation. For the competent authority, it is the evidence that the Air Operator Certificate holder understands its obligations and has the processes in place to discharge them safely and consistently. For the operational teams who use it every day, it is the definitive reference for how the airline conducts its approved activities — from the governance structure and duty time limitations in OM-A, through the aircraft-specific operating procedures in OM-B, to the route and airfield data in OM-C and the training programmes in OM-D.

Building an operations manual suite that satisfies the authority and functions as a genuine operational tool requires something that generic templates and document assembly services cannot provide: a deep understanding of the regulatory framework, the specific aircraft being operated, the route environment, and how the airline actually works. A suite built on a template tells the authority what it wants to hear. A suite built on operational reality tells the authority what is true — and is far more credible for it.

Aerospace and Aviation Consulting Services (AACS) develops, revises and maintains airline operations manual suites for scheduled and non-scheduled commercial air transport operators under UK CAA, EASA and equivalent national authority frameworks. We write manuals that are accepted by the authority, accurate about the operation, and usable by the people who depend on them.

The Regulatory Framework

Commercial air transport operators in the UK and Europe are required to maintain a four-part operations manual suite under the following regulatory frameworks:

AACS aligns all operations manual development with the current version of the applicable regulatory framework, including all current AMC (Acceptable Means of Compliance) and GM (Guidance Material) issued by the UK CAA or EASA. We monitor regulatory change and advise clients when amendments to the framework require corresponding manual revisions.

The Four-Part Operations Manual Suite

The operations manual suite for a commercial air transport operator is divided into four parts, each addressing a distinct dimension of the approved operation. Together they form a coherent, integrated framework — and AACS ensures that the four parts are consistent with each other and with the operator’s SMS, compliance monitoring system and any associated Part 145 or CAMO approvals.

OM-A — General Operating Manual

OM-A is the foundational document of the airline. It describes the organisation’s structure, its management framework, its general operating policies, and the overarching regulatory obligations that apply across the entire operation regardless of aircraft type or route. It is the part of the manual suite most closely scrutinised by the competent authority during initial AOC certification and subsequent oversight audits — because it tells the authority what kind of organisation this is, who is accountable for what, and how the airline governs itself.

OM-A must be current at all times. Any change to the organisation’s structure, its nominated persons, its safety management framework, its dangerous goods policy or its fatigue risk management arrangements requires a corresponding OM-A amendment. An outdated OM-A is a regulatory non-compliance and a finding waiting to happen.

OM-A content developed and maintained by AACS covers:

• Organisational structure — management hierarchy, Accountable Manager statement, Nominated Person appointments and responsibilities
• Operational control and command authority framework
• General operating procedures — flight preparation, fuel policy, weather minima, alternate selection, contingency procedures
• Flight time and duty period limitations — FTL scheme design and documentation aligned with UK CAA / EASA ORO.FTL requirements
• Fatigue Risk Management System (FRMS) documentation where applicable
• Dangerous goods acceptance, handling and documentation procedures
• Security procedures — flight crew security, cockpit access, threat response and AVSEC programme
• Safety Management System framework — policy, structure, hazard identification, occurrence reporting and safety performance
• Compliance monitoring system — internal audit programme, finding management and corrective action
• Ground operations oversight — handling agent control, ramp safety and ground handling agreements
• Accident and incident reporting and investigation procedures
• Carriage of passengers with reduced mobility, unaccompanied minors and special categories
• Search and rescue — crew responsibilities and procedures

OM-B — Aircraft Operating Manual

OM-B is the aircraft-specific part of the operations manual suite. Each aircraft type operated under the AOC requires its own OM-B, describing the operating procedures, performance data and limitations, normal and abnormal checklists, and aircraft systems information applicable to that specific type and configuration. OM-B is the manual that flight crew use — and it must reflect precisely how the airline operates that aircraft on its specific routes, in its specific operating environment, with its specific configuration and MEL.

A generic OM-B that does not reflect the operator’s specific aircraft configuration, route environment and operational practices is a compliance risk and a practical problem. Crew who encounter procedures in OM-B that do not match their aircraft or their training will work around them. AACS produces OM-B content that is technically accurate for the specific aircraft, operationally relevant to the route environment, and consistent with the Type Rating training programme.

OM-B content developed and maintained by AACS covers:

• Aircraft type description and certification basis
• Normal operating procedures — pre-flight, departure, en route, approach, landing, post-flight
• Abnormal and emergency procedures — aligned with QRH and FCOM content and flight crew training
• Performance — take-off, en route, approach and landing performance documentation and operator’s performance policy
• Weight and balance — load planning procedures and centre of gravity limits
• Minimum Equipment List (MEL) — operator MEL development from MMEL, dispatch conditions and rectification intervals
• Configuration Deviation List (CDL) — procedures for dispatch with missing external components
• Standard Operating Procedures (SOPs) — callout standards, PF/PM task sharing, crew coordination procedures
• Navigation and communication equipment operating procedures
• Fuel system management and fuel planning procedures
• Systems descriptions — as required to support operating procedures
• Cold weather and contaminated runway operations procedures
• ETOPS procedures where applicable — system requirements, pre-departure checks, en route procedures, diversion planning
• Reduced vertical separation minimum (RVSM) and performance-based navigation (PBN) operating procedures

OM-C — Route & Airfield Manual

OM-C provides the route-specific and airfield-specific operational information that crews require to conduct operations safely on the routes approved under the AOC. It is not a navigation database — it is the operator’s documented operational assessment of each route and aerodrome in the approved network, including specific procedures, limitations, hazards and local requirements that are not captured in standard aeronautical publications.

For airlines expanding their route network, adding new destinations or seasonal operations, OM-C must be updated before operations commence. For airlines operating to challenging destinations — high-altitude airports, noise-sensitive environments, airports with specific weather hazards, or aerodromes with limited instrument approach infrastructure — OM-C is the document that demonstrates to the authority that the operator has assessed and mitigated the specific risks of each route.

OM-C content developed and maintained by AACS covers:

• Route descriptions and area of operations definition — airways, waypoints and airspace structure relevant to approved routes
• Aerodrome data — runway dimensions, declared distances, lighting, instrument approach procedures, obstacle environment
• Operator’s specific aerodrome procedures — local procedures, noise abatement, specific approach briefing requirements
• Alternate aerodrome selection policy and approved alternate list
• Airport slot and curfew limitations affecting operations
• Special area procedures — NAT HLA, PACOTS, MNPS and other special area requirements
• Performance-limiting airports — specific take-off and landing performance documentation for challenging destinations
• High-altitude aerodrome procedures where applicable
• Overwater operations requirements — survival equipment, ditching procedures, extended range considerations
• Foreign and domestic air traffic control procedures and phraseology
• Route-specific weather hazards — significant meteorological phenomena, seasonal conditions and avoidance procedures

OM-D — Training Manual

OM-D is the definitive record of the airline’s training framework — the document that demonstrates to the competent authority that all operational personnel are trained and assessed to the required standard before conducting duties, and that recurrent training maintains and verifies that standard throughout their service. For the authority, OM-D is the evidence that the airline has a structured, auditable training system. For the crew and operational staff who go through it, it describes the training they should actually receive.

OM-D must be consistent with OM-B in its aircraft-specific content and with OM-A in its descriptions of fatigue, dangerous goods and security training requirements. It must also align with the Type Rating programme conducted by the Type Rating Training Organisation, where that training is contracted externally. AACS ensures that OM-D accurately reflects the training programme the airline delivers — not an aspirational version that does not match operational reality.

OM-D content developed and maintained by AACS covers:

• Initial Type Rating training programme — ground school syllabus, simulator training phases, base training and line training requirements
• Recurrent training programme — operator proficiency checks (OPC), line checks, simulator recurrency and annual ground school requirements
• Crew Resource Management (CRM) training — initial and recurrent CRM programme design and documentation aligned with ORO.FC.115
• Competency-based training and evidence-based training (EBT) programme documentation where applicable
• Low visibility operations (LVO) training — CAT II/III approach training and authorisation requirements
• ETOPS crew training requirements where applicable
• Dangerous goods awareness training — DG categories applicable to flight crew and cabin crew
• Security training — initial and recurrent AVSEC programme for flight crew and cabin crew
• Cabin crew training programme — initial safety and emergency procedures, SEP recurrency, first aid and CRM
• Ground operations and ramp safety training programme for ground handling personnel
• New entrant and differences training programmes for crew transitioning between variants
• Training records management and competency documentation framework
• Instructor and examiner qualification and recency requirements
• Line training captain and type rating examiner designation framework

The Manual Suite in Practice: What Good Looks Like

Most operations manual suites in service today have one or more of the following problems. They were written during AOC certification and have not been systematically maintained since. They were built on a template that did not accurately reflect the airline’s actual operations. The four parts are inconsistent with each other because they were revised at different times by different people. Or the suite satisfies the authority’s checklist but is not usable by operational teams because it was written for the inspector, not for the crew.

Each of these problems has direct safety and regulatory consequences. AACS approaches every operations manual engagement — whether developing a new suite from the ground up or reviewing an existing one — with a clear understanding of what a genuinely effective manual suite looks like.

Accuracy Above All

The single most important quality of an operations manual suite is that it accurately describes the organisation’s approved activities. This sounds obvious. In practice it is the most commonly violated principle in aviation documentation. A procedure that describes how an operation should theoretically be conducted — rather than how it is actually conducted, with the aircraft in service, on the routes operated, by the crew available — is a procedure that will be worked around.

AACS develops manual content by first understanding the operation: the aircraft type and configuration, the route network, the crew structure, the handling agents and third-party providers in use, the SMS framework, and the compliance monitoring system. The documentation follows from that understanding. Where the investigation reveals that the current operation is not consistent with regulatory requirements, we identify that gap and advise on how to close it — before the authority does.

Internal Consistency Across All Four Parts

The four parts of an operations manual suite do not exist independently. OM-A’s description of the fatigue risk management policy must be consistent with the duty period limitations in the FTL scheme. OM-B’s SOPs must align with the training programme in OM-D. OM-C’s alternate aerodrome policy must reflect the fuel planning procedures described in OM-B. An inconsistency between parts is a finding at authority audit — and a potential source of operational confusion.

AACS maintains the coherence of the manual suite as a whole, not simply the correctness of each individual section. When we revise one part, we assess the implications for all others.

Proportionate to the Operation

An operations manual suite written for a 100-aircraft scheduled carrier is not appropriate for a 3-aircraft regional airline, even if both hold the same category of AOC. The manual must be proportionate to the scale, scope and complexity of the specific operation. A small regional carrier with a single aircraft type operating short-haul routes does not need the same depth of ETOPS procedures, performance documentation or training framework as a long-haul operator with a mixed fleet. But it does need procedures that are specific to its actual aircraft, actual routes and actual crew structure.

Proportionality does not mean less rigour — it means the right rigour for the right operation. AACS calibrates manual content to the operator’s actual scope, ensuring that the suite is complete, accurate and no more administratively burdensome than the operation genuinely requires.

Built to Be Maintained

The most underestimated aspect of an operations manual suite is the burden of keeping it current. Regulatory amendments require updates. Fleet changes require OM-B revisions. New routes require OM-C additions. Training programme changes require OM-D amendments. Each change requires the revision to be documented, the manual holders to be notified, and in some cases the competent authority to be informed or to provide acceptance.

AACS designs document control and revision management systems that make this process a managed activity rather than an ad hoc burden. We build amendment logs, revision records and distribution frameworks into the manual structure from the outset, and provide ongoing amendment support for operators who want their suite maintained by specialists rather than managed in-house.

Core Airline Operations Manual Services

New AOC Application — Full Suite Development

For airline start-ups and operators seeking their initial Air Operator Certificate, the operations manual suite is the centrepiece of the certification process. The competent authority will examine it in detail, raise questions, identify deficiencies and require revisions before granting approval. The quality of the initial submission determines how long this process takes and how much rework is required. A well-constructed suite, submitted by an organisation that clearly understands its regulatory obligations, accelerates the process. A poorly constructed suite, built on an adapted template, creates a protracted and costly revision cycle.

AACS develops initial airline operations manual suites for new AOC applicants from the ground up, working alongside the operator through the authority engagement process from first submission to final acceptance.

Services include:

• Regulatory pathway assessment — confirming the applicable framework (UK CAA, EASA, national authority) and the specific requirements applicable to the operator’s intended scope
• Pre-application gap analysis — identifying what the operator has in place and what needs to be built
• Full OM-A, OM-B, OM-C and OM-D development — written for the specific operation, not adapted from a template
• Nominated Person qualification framework — supporting the Accountable Manager and NP appointments required for AOC grant
• Pre-application meeting preparation and support — preparing the operator for engagement with the competent authority before submission
• Authority comment and finding response — drafting responses to authority queries and managing revision cycles through to acceptance
• Compliance demonstration planning — advising on how to demonstrate to the authority that the documented procedures are actually followed

Manual Suite Revision — Regulatory or Operational Change

Established operators require manual revisions whenever the regulatory framework changes, the operation evolves, or a significant change to the organisation or its fleet requires corresponding documentation updates. Regulatory revisions that are not reflected in the manual suite are non-compliances. Operational changes that are not documented create the divergence between documentation and practice that authority audits are designed to identify.

Services include:

• UK CAA post-Brexit regulatory change implementation — revising manual suites to reflect UK-specific amendments to Part-OPS requirements
• EASA AMC/GM update implementation — revising manual suites to reflect changes to Acceptable Means of Compliance and Guidance Material
• Fleet change documentation — new OM-B development for additional aircraft types, variant differences documentation, MEL revision
• Route network expansion — OM-C additions for new destinations, new area of operations documentation, alternate aerodrome list revision
• Organisational change documentation — Nominated Person changes, base additions, handling agent changes, sub-contractor arrangements
• FTL scheme revision — updating duty period limitations, rest requirements and FRMS documentation
• AOC variation documentation — preparing the manual amendments required to support an application for AOC scope variation

Independent Manual Review — Audit Preparation

Many airline operators seek an independent review of their operations manual suite ahead of a scheduled authority oversight audit, following a period of significant operational change, or when internal resource constraints have resulted in revision backlogs. An AACS review identifies the gaps and inconsistencies that an authority inspector would find — and provides a structured corrective action plan to address them before the audit.

Services include:

• Structured gap analysis of the full manual suite against current UK CAA / EASA Part-OPS requirements
• Internal consistency review — checking that all four parts are mutually consistent and consistent with the operator’s SMS, compliance monitoring and training frameworks
• Operational accuracy review — assessing whether the manual accurately describes how the airline currently operates
• Amendment and revision record review — checking that all revisions have been properly documented and distributed
• Corrective action plan — a prioritised list of amendments required before the authority audit
• Finding response support — where an authority audit has already identified findings, AACS supports the development of the corrective action response

MEL Development & Maintenance

The Minimum Equipment List is one of the most operationally critical documents an airline produces. It defines the conditions under which the aircraft may be dispatched with specific systems or equipment unserviceable, and the procedures and limitations that apply when it is. An MEL that is not current with the aircraft’s configuration, that has not been revised to reflect MMEL amendments, or that contains dispatch conditions that do not reflect the operator’s actual route environment and maintenance capability, creates both airworthiness and regulatory risk.

AACS develops and maintains operator MELs for all aircraft types operated under commercial AOCs, working from the applicable Master MEL and tailoring the document to the operator’s specific configuration, route network and maintenance arrangements.

Services include:

• Operator MEL development from MMEL — establishing the operator’s baseline MEL from the applicable Master MEL
• MEL customisation to reflect the operator’s specific aircraft configuration, avionics fit and cabin equipment
• Dispatch condition review — ensuring dispatch conditions are appropriate to the operator’s route environment, alternate availability and maintenance capability
• MMEL revision implementation — updating the operator MEL when the applicable MMEL is amended
• MEL authority acceptance — managing submission to and acceptance by the UK CAA or EASA
• Configuration Deviation List (CDL) development where applicable
• MEL training support — advising on crew and dispatcher training requirements for MEL usage

SOP Development & Standardisation

Standard Operating Procedures are the operational backbone of OM-B — the detailed, step-by-step procedures that flight crew follow for every phase of flight and every system configuration. SOPs that are not aligned with the aircraft manufacturer’s FCOM, that have not been updated following aircraft modification or software change, or that do not reflect the specific configuration of the operator’s fleet create inconsistency in crew performance and vulnerability in authority oversight.

Services include:

• SOP development for new aircraft type entries — creating operator-specific SOPs aligned with FCOM and Type Rating training
• SOP revision following aircraft modification, avionics upgrade or manufacturer SOP change
• SOP standardisation review — ensuring consistency across the operator’s SOP suite and alignment with recurrent training
• Single-pilot operation SOP design — for operators conducting CAT operations with single-pilot type ratings
• Pilot monitoring (PM) / Pilot flying (PF) task sharing documentation
• Approach briefing and stabilised approach policy documentation
• Go-around and missed approach procedure standardisation

Why AACS for Airline Operations Manual Development

Direct Experience With the Regulatory Process

AACS advisors have direct experience of the airline operations manual development and authority engagement process under UK CAA and EASA frameworks. We have produced initial AOC manual suites, managed the revision process for established carriers, and supported operators through the authority oversight audit cycle. We understand what competent authority inspectors look for in each part of the manual suite — and we understand the difference between documentation that is technically compliant and documentation that reflects a genuinely well-run airline.

We Write for the Operation, Not the Template

No two airline operations are the same. A low-cost carrier operating narrow-body aircraft on high-frequency short-haul routes has fundamentally different operational procedures, crew structures, fatigue risk profiles and training requirements from a leisure carrier operating wide-body aircraft on long-haul holiday routes. Generic templates cannot capture these differences. AACS builds every operations manual suite from the ground up for the specific operation — the specific aircraft, the specific routes, the specific crew establishment and the specific commercial model.

Integrated Across All Four Parts

The four parts of an operations manual suite are not independent documents. They are four dimensions of a single operational framework, and inconsistencies between them are among the most common findings at authority audit. AACS designs and maintains manual suites as integrated documents — ensuring that what OM-A says about the safety management framework is consistent with what the SMS documentation says, that what OM-B says about procedures is consistent with what OM-D says about training, and that what OM-C says about alternates is consistent with what OM-B says about fuel policy.

Authority Engagement Through to Acceptance

Manual development does not end at submission. Competent authorities review submissions, raise comments and require revisions before granting acceptance. For complex initial AOC applications, this process can extend over many months and multiple revision cycles. AACS manages the full authority engagement process — drafting responses to authority comments, revising the manual to address findings, and maintaining the dialogue with the competent authority through to final acceptance.

Ongoing Support as the Airline Evolves

An airline’s operations manual suite is never finished. Regulatory frameworks change. Fleets grow. Routes expand. Procedures are refined. AACS provides ongoing amendment and revision support for airline clients who want their manual suite maintained by specialists — ensuring that the documentation remains current, accurate and compliant as the operation develops. This is particularly valuable for smaller carriers and start-ups who do not have dedicated in-house compliance documentation resource.

No Commercial Conflicts

AACS operates independently of aircraft manufacturers, type rating training organisations, ground handling companies and certification bodies. Our advice on operations manual content is driven solely by what is correct for the specific operation and what the regulatory framework requires. We have no commercial interest in recommending any particular approach, provider or solution beyond the one that is right for the client.

Our Advisory Philosophy for Airline Operations Manuals

AACS approaches airline operations manual development with a conviction built on over 30 years of regulatory and operational experience: the manual suite is not a certification deliverable — it is the foundational governance document of a safe airline. An airline whose manual suite accurately describes how it operates, whose four parts are mutually consistent, and whose procedures are followed because they reflect operational reality, is an airline that is genuinely compliant — not just documentarily so.

✔  Every manual suite is developed for the specific airline — the specific aircraft, routes, crew structure and commercial model

✔  All four parts are designed and maintained as a coherent, integrated framework — not four independent documents

✔  Manual content must be accurate about the operation — not aspirational, not generic, not borrowed from another operator

✔  The authority engagement process is managed through to acceptance — not handed over at the point of submission

✔  Document control systems are built in from the outset — ensuring the suite remains current as the airline evolves

✔  MELs and SOPs are developed with the same rigour as the main manual — as operationally critical documents, not appendices

✔  Our advice is independent — shaped by what is correct for the operation, not by any commercial relationship

We deliver documentation that is independently assessed as accurate, operationally credible, and built on direct experience of what competent authorities look for and what operational teams depend on. Whether you are building a manual suite for the first time, revising an existing suite that has not kept pace with the operation, or seeking independent review ahead of an authority audit, AACS provides the expertise to produce documentation that genuinely works.

Speak to an AACS Specialist

If you need an airline operations manual suite developed, revised, reviewed or maintained — for an initial AOC application, a regulatory change implementation, or preparation for an authority oversight audit — please contact us. We will be direct about what your documentation requires, what the authority will expect, and how we can help you achieve acceptance efficiently.