Devenition And Abreviation Aeronautical Telecommunication (Alphabet S)

Safe forced landing. Unavoidable landing or ditching with a reasonable expectancy of no injuries to persons in the aircraft or on the surface. 

Safety area. A defined area on a heliport surrounding the FATO which is free of obstacles, other than those required for air navigation purposes, and intended to reduce the risk of damage to helicopters accidentally diverging from the FATO. 

Safety management system. A system for the management of safety at aerodromes, including the organizational structure, responsibilities, procedures, processes and provisions for the implementation of aerodrome safety policies by an aerodrome operator, which provides for control of safety at, and the safe use of, the aerodrome. 

Safety recommendation. A proposal of the accident investigation authority of the State conducting the investigation, based on information derived from the investigation, made with the intention of preventing accidents or incidents.
 

Safety-sensitive personnel. Persons who might endanger aviation safety if they perform their duties and functions improperly including, but not limited to, crew members, aircraft maintenance personnel and air traffic controllers. 

Scheduled Air Service - Any air transportation service which is operated on a weekly basis and in accordance with a published schedule. 

Sea level engine means a reciprocating aircraft engine having a rated takeoff power that is producible only at sea level. 

Search. An operation normally coordinated by a rescue coordination centre or rescue subcentre using available personnel and facilities to locate persons in distress. 

Search and rescue aircraft. An aircraft provided with specialized equipment suitable for the efficient conduct of search and rescue missions. 

Search and rescue facility. Any mobile resource, including designated search and rescue units, used to conduct search and rescue operations. 

Search and rescue region (SRR). An area of defined dimensions, associated with a rescue coordination centre, within which search and rescue services are provided. 

Search and rescue service. The performance of distress monitoring, communication, coordination and search and rescue functions, initial medical assistance or medical evacuation, through the use of public and private resources, including cooperating aircraft, vessels and other craft and installations. 

Search and rescue services unit. A generic term meaning, as the case may be, rescue coordination centre, rescue subcentre or alerting post. 

Seating Capacity .The maximum number of passenger seats authorized by, the type certificate, type approval, or other equivalent document. 

Second (s). The duration of 9 192 631 770 periods of the radiation corresponding to the transition between the twohyperfine levels of the ground state of the caesium-133 atom. 

Second in command (SIC) means a pilot who is designated to be second in command of an aircraft during flight time.

Second Officer (SO). A pilot who is the holder of a commercial or higher pilot license and is endorsed on an aircraft type, as competent on the flight engineers panel and may act as a flight crewmember with respect to the flight engineer duties. 

Secondary surveillance radar (SSR). A surveillance radar system which uses transmitters/receivers (interrogators) and transponders. 

Security management. An ATN systems management facility for access control, authentication and data integrity. 

Segregated parallel operations. Simultaneous operations on parallel or near-parallel instrument runways in which one runway is used exclusively for approaches and the other runway is used exclusively for departures. 

Semi-automatic relay installation. A teletypewriter installation where interpretation of the relaying responsibility in respect of an incoming message and the resultant setting-up of the connections required to effect the appropriate retransmissions require the intervention of an operator but where all other normal operations of relay are carried out automatically. 

Serious incident. An incident involving circumstances indicating that an accident nearly occurred. 

Serious injury. An injury which is sustained by a person in an accident and which: 

a) requires hospitalization for more than 48 hours, commencing within seven days from the

    date the injury was received; or 

b) results in a fracture of any bone (except simple fractures of fingers, toes or nose); or 

c) involves lacerations which cause severe haemorrhage, nerve, muscle or tendon damage; or 

d) involves injury to any internal organ; or 

e) involves second or third degree burns, or any burns affecting more than 5 per cent of the

    body surface; or 

f) involves verified exposure to infectious substances or injurious radiation. 

Service area (world area forecast system). A geographical area within which a regional area forecast centre is responsible for issuing area forecasts to meteorological authorities and other users. 

Service Difficulty Report (SDR) means the certificate holder report the occurrence or detection of each failure, malfunction, or defect. (ref. CASR 121.703) 

Shoulder. An area adjacent to the edge of a pavement so prepared as to provide a transition between the pavement and the adjacent surface. 

Show, unless the context otherwise requires, means to show to the satisfaction of the DGCA. SIC – Second in command. A pilot assigned to act as a first officer or co-pilot of an aircraft.

Sign a maintenance release (to). To certify that maintenance work has been completed satisfactorily in accordance with the applicable Standards of airworthiness, by issuing the maintenance release referred to in Annex 6. 

Siemens (S). The electric conductance of a conductor in which a current of 1 ampere is produced by an electric potential difference of 1 volt. 

Sievert (Sv). The unit of radiation dose equivalent corresponding to 1 joule per kilogram. 

Simplex. A method in which telecommunication between two stations takes place in one direction at a time. 

Single Pilot – the operation of an aircraft with only one pilot on board. 

Single channel simplex. Simplex using the same frequency channel in each direction. 

Signal area. An area on an aerodrome used for the display of ground signals. 

SIGMET information. Information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of aircraft operations. 

Significant point. A specified geographical location used in defining an ATS route or the flight path of an aircraft and for other navigation and ATS purposes.
Sign.
a) Fixed message sign. A sign presenting only one message. 

b)Variable message sign. A sign capable of presenting several pre-determined messages or no message,

   as applicable. Signal area. An area on an aerodrome used for the display of ground signals. 

Slotted aloha. A random access strategy whereby multiple users access the same communications channel independently, but each communication must be confined to a fixed time slot. The same timing slot structure is known to all users, but there is no other coordination between the users. 

Slush. Water-saturated snow which with a heel-and-toe slap-down motion against the ground will be displaced with a splatter; specific gravity: 0.5 up to 0.8. 

Small aircraft means aircraft of 12,500 pounds (5 700 kg) or less, maximum certificated takeoff weight. 

Small aeroplane. Small light aeroplane means an aeroplane having a maximum total weight authorized (MTWA) not exceeding 300 kg for single seat airplanes, or 450 kg for two seat airplanes and designed to carry not more than two persons. 

Smoke. The carbonaceous materials in exhaust emissions which obscure the transmission of light. 

Smoke Number. The dimensionless term quantifying smoke emissions.
 

Snow (on the ground).
a) Dry snow. Snow which can be blown if loose or, if compacted by hand, will fall apart

    again upon release; specific gravity: up to but not including 0.35.
b) Wet snow. Snow which, if compacted by hand, will stick together and tend to or form 

    a snowball; specific gravity: 0.35 up to but not including 0.5. c) Compacted snow. 

    Snow which has been compressed into a solid mass that resists further compression 

    and will hold together or break up into lumps if picked up; specific gravity: 0.5 and over. 

SNOWTAM. A special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of a specific format. 

S/O – Second Officer. A pilot who is the holder of a commercial or higher pilot licence and is endorsed on an aircraft type, as competent on the flight engineers panel and may act as a flight crewmember with respect to the flight engineer duties. 

Solo flight time. Flight time during which a student pilot is the sole occupant of an aircraft. 

Special VFR conditions mean meteorological conditions that are less than those required for basic VFR flight in controlled airspace and in which some aircraft are permitted flight under visual flight rules. 

Special VFR operations means aircraft operating in accordance with clearances within controlled airspace in meteorological conditions less than the basic VFR weather minima. Such operations must be requested by the pilot and approved by ATC. 

Special VFR flight. A VFR flight cleared by air traffic control to operate within a control zone in meteorological conditions below VMC. 

Specific Operation – means a specialized area of operation within the group of aerial work operations, described as special purpose air transportation services, in CASR 135.3(b) and Appendix A-A of this Part. 

Standard isobaric surface. An isobaric surface used on a worldwide basis for representing and analysing the conditions in the atmosphere. Standard atmosphere means an atmosphere defined as follow :
a) The air a perfect dry gas ;
b) The physical constants are :

State of Design. The State having jurisdiction over the organization responsible for the type design of Manufacture. The State having jurisdiction over the State organization responsible for the final assembly of the aircraft. 

State of Origin. The State in the territory of which the cargo was first loaded on an aircraft. 

State of the Operator. The State in which the operator’s principal place of business is located or, if there is no such place of business, the operator’s permanent residence. 

State of Registry. The State on whose register the aircraft is entered. 

Station declination. An alignment variation between the zero degree radial of a VOR and true north, determined at the time the VOR station is calibrated. 

State of Manufacture. The State having jurisdiction over the organization responsible for the final assembly of the aircraft. 

State of Occurrence. The State in the territory of which an accident or incident occurs. 

Steradian (sr). The solid angle which, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.
 

Stopway means an area beyond the takeoff runway, no less wide than the runway and centered upon the extended centerline of the runway, able to support the airplane during an aborted takeoff, without causing structural damage to the airplane, and designated by the airport authorities for use in decelerating the airplane during an aborted takeoff or A defined rectangular area on the ground at the end of take-off run available prepared as a suitable area in which an aircraft can be stopped in the case of an abandoned take-off. 

Subnetwork. An actual implementation of a data network that employs a homogeneous protocol and addressing plan and is under control of a single authority. 

Surface level heliport. A heliport located on the ground or on the water. 

Supplemental Air Carrier. An air carrier whose operations specifications authorize charter or all cargo operations. 

Surveillance radar. Radar equipment used to determine the position of an aircraft in range and azimuth. 

Survival ELT (ELT(S)). An ELT which is removable from an aircraft, stowed so as to facilitate its ready use in an emergency, and manually activated by survivors. 

Switch-over time (light). The time required for the actual intensity of a light measured in a given direction to fall from 50 per cent and recover to 50 per cent during a power supply changeover, when the light is being operated at intensities of 25 per cent or above. 

Switched virtual circuit (SVC). The primary circuit management technique provided within the ISO 8208 protocol. The network resources are dynamically allocated when needed and released when no longer required. 

System level requirement. The system level requirement is a high-level technical requirement that has been derived from operational requirements, technological constraints and regulatory constraints (administrative and institutional). The system level requirements are the basis for the functional requirements and lower-level requirements. 

Synthetic flight trainer. Any one of the following three types of apparatus in which flight conditions are simulated on the ground : 

A flight simulator, which provides an accurate representation of a flight deck of a particular aircraft type to the extend that the mechanical, electrical, electronic, aircraft system control functions, the normal environment of flight crew members, and the performance and flight characteristics of that type of aircraft are realistically simulated. 

A flight procedures trainer, which provides a realistic flight deck environment, and which simulates instrument responses, simple control function of mechanical, electrical, electronic, etc. aircraft system, and the performance flight characteristics of aircraft of a particular class. 

A basic instrument flight trainer, Which is equipped with appropriate instruments, and which simulates the flight deck environment of an aircraft in flight in instrument flight condition.