Annex E – AMC 1 Integrity and assurance levels for the Operational Safety Objectives (OSO)

CAA ORS9 Decision No. 46

[Editorial note: Annex E – AMC1 will be amended on 1 October 2026. Updated text is given below]

Introduction

1.1

Annex E provides Low/Medium/High assessment requirements for the integrity (i.e. the safety gain) and assurance (i.e. the method of proof) of the Operational Safety Objectives (OSO) to be complied with by an Applicant.

1.2

Where more than one criterion exists for a given level of robustness in an OSO, all the criteria need to be met at the required robustness level in order to comply with the OSO.

1.3

A number of OSOs propose an alternative Functional Test Based (FTB) approach to complying with the OSO criteria.

1.4

Where AMC or GM specifies a letter, it is applicable to the related requirement. E.g. GM.OSO3.L.I (a) is guidance material to the requirement OSO3.L.I (a).

1.5

The CAA will adopt standards to be used as AMC in the future and is actively working with standards bodies. The Applicant may propose AMC to certain requirements to the CAA. The Applicant may consult the following documents to identify standards that they wish to propose to the CAA as AMC:

(i) JARUS SORA 2.5 (where comments identify standards to be used as AMC).

(ii) SHEPHERD D2.1-D3.1 – Identification of satisfactory industry standards and justification for unacceptable industry standards.

(iii) SHEPHERD D2.2-D3.2 – Identification of satisfactory industry standards and justification for unacceptable industry standards.

1.6

The CAA has introduced two new policy concepts; CAP 722J - Recognised Assessment Entity for Flightworthiness (RAE(F)) and CAP 722K - SAIL Mark Policy.

1.7

The RAE(F) policy is intended for use by an entity that is, or wishes to be approved, as an RAE(F). An Applicant may use the services of an RAE(F) to demonstrate compliance with several UK SORA requirements. Full details of which UK SORA requirements may be met using an RAE(F) can be found in CAP 722J.

1.8

The SAIL Mark policy is intended for use by the Designer of an UAS and a RAE(F) to understand the requirements, administrative processes and guidance to enable the delivery of a Specific Assurance and Integrity Level (SAIL) Mark certificate for a UAS to be operated within the Specific Category in the United Kingdom.

Annex E – AMC 1 Integrity and assurance levels for the Operational Safety Objectives (OSO)

CAA ORS9 Decision No. 60

Text in magenta in force from 1 October 2026

E1. Introduction

E.1.1

E.1.2

Where more than one criterion exists for a given level of robustness in an OSO, all the criteria need to be met at the required robustness level in order to comply with the OSO.

E.1.3

A number of OSOs propose an alternative Functional Test Based (FTB) approach to complying with the OSO criteria.

E.1.4

Where AMC or GM specifies a letter, it is applicable to the related requirement. E.g. GM.OSO3.L.I (a) is guidance material to the requirement OSO3.L.I (a). There are some instances where this may not be exactly matched. In those instances, the GM will clearly specify which part of the requirement it seeks to address.

E.1.5

(i) JARUS SORA 2.5 (where comments identify standards to be used as AMC).

(ii) SHEPHERD D2.1-D3.1 – Identification of satisfactory industry standards and justification for unacceptable industry standards.

(iii) SHEPHERD D2.2-D3.2 – Identification of satisfactory industry standards and justification for unacceptable industry standards.

E.1.6

The CAA has introduced two new policy concepts; CAP 722J - Recognised Assessment Entity for Flightworthiness (RAE(F)) and CAP 722K - SAIL Mark Policy.

E.1.7

E.1.8