Second-in-command (SIC)
A licensed and qualified pilot that assists or relieves the pilot-in-command, not to include a pilot that is on board the aircraft for the sole purpose of receiving flight instruction.
Equivalent Terms: Co-pilot, First Officer Security (Aviation)
The safeguarding of civil aviation against acts of unlawful interference, achieved by a combination of measures and human and material resources.

Security Audit
An in-depth compliance examination of all aspects of the implementation of the national civil aviation security programme.

Security Control
A means by which the introduction of weapons, explosives or other dangerous devices, articles or substances which may be utilised to commit an act of unlawful interference can be prevented.

Security Equipment
Devices of a specialised nature for use, individually or as part of a system, in the prevention or detection of acts of unlawful interference with civil aviation and its facilities.

Security Inspection
An examination of the implementation of relevant national civil aviation security programme requirements by an Operator, airport, or other provider entity involved in security.

Security Management System (SEMS)
The documented system of an Operator based on threat assessment to ensure security operations consistently fulfill all requirements mandated in the national civil aviation security programme of the State of the Operator in the most efficient and cost effective manner considering the operational environment of the airline.