Supplemental Oxygen
The additional oxygen required on an aircraft to protect each occupant against the adverse effects of excessive cabin altitude and to maintain acceptable physiological conditions.
Supplier
An organisation that sells products or services for use by the air transport industry. The products may include maintenance, spare parts and information.
Surplus
Describes a product, assembly, part, or material that has been released as surplus by the military, manufacturers, owners/operators, repair facilities, or any other parts supplier. These products should show traceability to a manufacturing procedure approved by the applicable authority.
Surveillance
A continuing, but intermittent, inspection or audit of a system or combination of systems and procedures. Equivalent Terms: Continuous Surveillance
System of Non-Shared Responsibility (Operational Control)
A system whereby the PIC has sole responsibility for all aspects of operational control, assisted and/or supported by a Flight Dispatchers/Flight Operations Officer (FOO) or other operational control personnel.
System of Shared Responsibility (Operational Control)
A system whereby the pilot-in-command and a Flight Dispatcher/Flight Operations Officer (FOO) have joint responsibility for all aspects of operational control.

T
Task
See Maintenance Task. Task Card
These include all maintenance or workshop tasks approved by an Instrument of Appointment Authorised Person as part of the System of Maintenance. Task Cards are computer or manually produced Sign-Off Sheets or Cards and include but are not limited to; Travellers; Tasks in Check Sheets; Survey Sheets; Maintenance Routines; Job Cards; Work Orders; Modification Cards; Scheduled Rectification Cards; Approved Repair Schemes; Operation Sheets.
They may detail all requirements or may refer to Amplification details in a particular manual or document. They are used to issue technical instructions and require certification for the accomplishment of that task. Task Cards are either Permanent or Inspection tasks and may be produced in either base, workshop or line maintenance locations for inspections, modifications or component changes.