Glossary Papakupu
Explanations of abbreviations and acronyms.
- OCS
- Oceanic control service
- Operating instruction
- A method of authorising a train journey for use only on the Midland line
- Operator
- A person authorised to operate a mobile track-maintenance vehicle and who is in charge of the train or machine group.
- Operator’s exposition
- A manual that defines the organisation, identifies the approved senior persons and details the means of compliance with the CARs.
- OpsSpec
- Operations specification (USA)
- Orographic uplift
- The process by which a mass of air is lifted by a geographical feature such as a line of hills or a mountain range.
- Out of ground effect (OGE)
- A helicopter is said to be OGE when the rotor downwash is no longer affected by the surface under it and more power is required to hover. This change occurs gradually at a height equivalent to about one rotor disc diameter.
- Outbound pilotage
- The activity carried out by a pilot in assisting the master of a ship in navigation while entering or leaving a port.
- Overhead position
- A pilot can join the circuit pattern at an unattended airfield by flying overhead the airfield at an altitude 500 ft above the circuit altitude so that they can assess the wind direction and circuit direction in use by other aircraft.
- Overrun
- An aircraft departs the end of a runway