Non-Destructive Testing (NDT)
Testing applications or methods used to examine aircraft or engine parts or components, which do not destroy or render the item or material unusable. Examples of such testing include Radiography, Eddy Current, Dye Penetrant, Ultrasonic, Thermal Imaging, Magnetic Particle Inspection.
Equivalent Terms: Non-Destructive Inspection (NDI) NOTAM (Notice to Airmen)
An official notice or communication issued by an NAA to inform pilots of hazardous conditions that could affect flight operations, or temporary or permanent changes associated with aeronautical facilities, services, or procedures.
NOTOC (Notification to Captain)
Accurate and legible written or printed information provided to the pilot-in-command concerning dangerous goods shipments or other special cargo that is to be carried on board the aircraft.
Equivalent Terms: NOTAC (Notification to Aircraft Commander), NOPIC (Notification to Pilot-in-command) 

O
Occupational Safety and Health
The promotion and maintenance of safety and health in the workplace, which includes, inter alia, controlling workplace risk, setting occupational health and safety regulations, providing medical and health services, and generally ensuring the well-being of workers.

Onboard Library
The collection of documents required to be available on board an aircraft and accessible for use by the flight crew during flight preparation and in flight.

 

One-stop Security
A concept whereby a passenger and accompanied baggage are subjected to only one security check during departure, even if the journey involves multiple transfers. The concept requires mutual acceptance of key security procedures used to verify that passengers, baggage, cargo consignments, the aircraft and any other item loaded on an aircraft for transport are free of dangerous items, thus not requiring duplication of such security procedures at transfer, transit and destination points.