# ICAO Annex 17 Essential Definitions: Security Control, Screening, and Aircraft Checks

> Learn ICAO Annex 17 aviation security definitions, including security control, screening, and aircraft security checks against acts of unlawful interference.

- **Subject:** 010 — Air Law
- **Section:** 010-12 — Security – Safeguarding International Civil Aviation against Acts of Unlawful Interference (ICAO Annex 17)
- **Topic code:** 010-12-01
- **Last reviewed:** 2026-03-27
- **Author:** Pablo Asensio Martínez
- **HTML version:** https://pilotsyllabus.com/en/air-law/security-safeguarding-international-civil-aviation-against-acts-of-unlawful-interference-icao-annex/essential-definitions-of-icao-annex-17/

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## Key Security Concepts
Annex 17 deals with the protection of civil aviation against **acts of unlawful interference**.

*   **Security Control:** Means by which the introduction of weapons, explosives, or other dangerous devices into civil aviation is prevented.
*   **Screening:** The application of technical or other means which are intended to identify and/or detect weapons, explosives or other dangerous devices.
*   **Aircraft Security Check:** An inspection of the interior of an aircraft to which passengers may have had access and an inspection of the hold for the purposes of discovering suspicious objects.

> The primary objective is the safety of passengers, crew, ground personnel, and the general public.

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