Issue 1

Issued: 01 December 2015

Reviewed: 01 December 2021

Effective: on issue


Overseas Territories Aviation Circulars (OTACs) are issued to provide advice, guidance and information on standards, practices and procedures necessary to support Overseas Territory Aviation Requirements. They are not in themselves law but may amplify a provision of the Air Navigation (Overseas Territories) Order or provide practical guidance on meeting a requirement contained in the Overseas Territories Aviation Requirements.


This Overseas Territories Aviation Circular provides guidance on the production of safety assessments to meet OTAR requirements and the need to identify alternative means to achieve an objective safely, without unacceptable risk. The principles contained in this OTAC may be applied in circumstances where requirements cannot be met and an alternative means of compliance is proposed.

The principles of this OTAC apply, equally, to the assessment of day-to-day issues that may be encountered within an operation. Within the framework of the safety management system organisations are required to assess issues/situations routinely.  Whilst these situations may not warrant the formality of the assessment, the process is the same.

Equally, this process should also be applied and documented when an organisation considers known hazards within compliant situations but is seeking improvements to levels of safety.


This Circular relates to all OTAR Parts which require safety assessments.


This Circular replaces the previous OTAC on Aeronautical Studies.


Enquiries regarding the content of this Circular should be addressed to Air Safety Support International at the address on the ASSI website or to the appropriate Overseas Territory Aviation Authority.