---
title: "ORO.MLR.101 Operations manual – structure for CAT and IAM operations — Part-ORO · Avioverse"
description: "Except for operations with single-engined propeller-driven aeroplanes with an MOPSC of 5 or less or single-engined non-complex helicopters with an MOPSC…"
url: "https://avioverse.aero/regulations/easa/air-ops/part-oro/subpart-mlr/oro-mlr-101"
---

# ORO.MLR.101 Operations manual – structure for CAT and IAM operations

ANNEX III (Part-ORO) · Regulation (EU) No 965/2012 · EAR revision 27 Mar 2026

IR Implementing rule

## ORO.MLR.101 Operations manual – structure for CAT and IAM operations

Except for operations with single-engined propeller-driven aeroplanes with an MOPSC of 5 or less or single-engined non-complex helicopters with an MOPSC of 5 or less, taking off and landing at the same aerodrome or [operating site](https://avioverse.aero/glossary/easa/operating-site), under VFR by day, the main structure of the operations manual (OM) shall be as follows:

(a) Part A: General/Basic, comprising all non-type-related operational policies, instructions and procedures;

(b) Part B: [Aircraft](https://avioverse.aero/glossary/easa/aircraft) operating matters, comprising all type-related instructions and procedures, taking into account differences between types/classes, variants or individual aircraft used by the operator;

(c) Part C: CAT operations with aeroplanes and helicopters, comprising route/role/area and aerodrome / operating site instructions and information or, IAM operations with VCA, comprising route/role/area and [vertiport](https://avioverse.aero/glossary/easa/vertiport) / diversion location / operating site instructions and information;

(d) Part D: Training, comprising all training instructions for personnel required to ensure safe operations.

IR · ORO.MLR.101 — Regulation (EU) No 965/2012 · Regulation (EU) 2024/1111 · Air OPS Easy Access Rules · EAR revision 27 Mar 2026

[All rules in SUBPART MLR: MANUALS, LOGS AND RECORDS](https://avioverse.aero/regulations/easa/air-ops/part-oro/subpart-mlr)

Consolidated from the EASA Easy Access Rules (revision 27 Mar 2026, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.