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SA: Shipyard Agreement (MARAD4)

SAAM: Special Assignment Airlift & Mission (MTMC1)

Saddle Tank: Fuel storage area on a tractor. (ATA1)

Saddle-Mount: (See also King-Pin Saddle-Mount, Lower-Half of Saddle Mount, Upper-Half of Saddle Mount) A device, designed and constructed as to be readily demountable, used in driveaway-towaway operations to perform the functions of a conventional fifth wheel. (49CFR393)

SAE: Society of Automotive Engineers (49CFR571) (NHTSA5)

SAFER: Safety and Fitness Electronic Records System (FHWA15)

Safety Alert: A safety alert issued by Air Traffic Control (ATC) to aircraft under their control. (FAA8)

Safety Defect: A defect in a product subject to the provisions of the 46 U.S.C. Chapter 43, which creates a substantial risk of personal injury to the public. The defective part or area may be under the provisions of 46 (U.S.C.) Chapter 43, and if so regulated, may or may not be in compliance with that standard. (USCG1)

Safety Harbor: An area which has been cleared of tree stumps before impoundment of the pool and in which a safe project depth is guaranteed for the mooring of vessels. First-class safety harbors are marked with orange boards. A second-class harbor has project depth only at pool stage, whereas the first class harbor maintains project depth even at drawn down winter levels of the pool. (Term peculiar to the Tennessee River.) (TNDOT1)

Safety Harbor Landing Markers: White arrow shaped boards pointing in the direction of cleared areas safe for mooring in demand reservoirs (used only on the Tennessee River). They indicate that the site has been cleared of tree stumps to a specified depth. (TNDOT1)

Safety Landing: Similar to safety harbor except that it consists of a small cleared area along the bank. (Found only on the Tennessee River at present). (TNDOT1)

SAFI: Semi Automatic Flight Inspection (FAA7)

Sailboat: Craft intended to be propelled primarily by sail, regardless of size or type. (USCG2)

Sailing Line: A printed course line appearing on river charts showing the recommended general course at the time the chart was issued. Usually out of date for open rivers; the navigator should consult the latest channel reports. (TNDOT1)

Saint Lawrence Seaway Development Corporation (SLSDC): The Saint Lawrence Seaway Development Corporation was established by act of May 13, 1954 (33 U.S.C. 981-990), as an operating administration of the Department of Transportation. The Corporation, a wholly Government owned enterprise, is responsible for the development, operation, and maintenance of that part of the St. Lawrence Seaway between the port of Montreal and Lake Erie, within the territorial limits of the United States. The function of the Seaway Corporation is to provide a safe, efficient, and effective water artery for maritime commerce, both in peacetime and in time of national emergency. (OFR1)

Sales-Weighted Miles Per Gallon: Calculation of a composite vehicle fuel economy based on the distribution of vehicle sales. (DOE6)

SALS: Short Approach Light System (14CFR1)

SAM: South American Region (USTTA1)

SAMIS: Safety Management Information Statistics (FTA3)

Sampling: A statistical technique for the collection of passenger mile data. The sampling technique may be one of the FTA approved procedures or an alternative methodology which meets FTA's requirements for the statistical reliability (95% confidence and 10% precision). (FTA1)

SAMS/MAMS: Special Airspace Management System/Military Airspace Management System (FAA7)

SAN: San Diego International Airport - Lindbergh Field (FAA11)

Sand Digger: A dredge engaged in obtaining sand and gravel from the riverbed. (TNDOT1)

SANPRM: Supplemental Advance Notice of Proposed Rulemaking (RSPA1)

SAR: Search and Rescue (FAA8)

SAR Facility: (See also Search and Rescue) A regular Reserve operated or augmented, or Auxiliary operated Coast Guard unit, such as an air station, small boat station, base (or support center), group/section, or other shore unit which has search and rescue as a primary mission. (USCG3)

SARMIS: Search and Rescue Management Information System (BTS7)

SARPS: Standards and Recommended Practices (FAA17) (FAA1)

SARSAT: Search and Rescue Satellite (FAA8)

SAS: Scandinavian Airlines System (FAA18)

SAS: Special Airlift Summary (MTMC1)

SAT: San Antonio International Airport (FAA11)

SATCOM: Satellite Communications (FAA17) (FAA7)

Satellite: A body that revolves around a larger body, such as the moon revolving around the earth, or a man-made object revolving about any body such as the sun, earth or moon. (AIA1)

SBIR: Small Business Innovation Research (FTA4)

SBRP: Special Bridge Replacement Program - 1970 (MTMC1)

SBT: Segregated Ballast Tanks (FHWA12)

SCATS: Sydney Coordinated Adaptive Traffic System (FHWA15)

SCF: Standard Cubic Foot (49CFR171)

Scheduled Air Transportation: Establishments primarily engaged in furnishing air transportation over regular routes and on regular schedules. This industry includes Alaskan carriers operating over regular or irregular routes. (BOC1)

Scheduled Aircraft Miles Completed: The aircraft miles completed on scheduled flights, computed between only those scheduled points actually served. (BTS5)

Scheduled Airlines, U.S.: Carriers certificated by the Federal government under Section 401 of the Federal Aviation Act permitting the operation of large aircraft larger than 60 seats. (ATAB1)

Scheduled Revenue Service: The total service scheduled to be provided for picking up and discharging passengers. Scheduled revenue service is computed from internal transit agency planning documents (e.g., run paddles, trip tickets and public timetables), and includes the whole trip (e.g., deadhead, layover/recovery, and actual picking up and discharging of passengers). Schedule service excludes service interruptions and special additional services. (FTA1)

Scheduled Service: Transport service operated pursuant to published flight schedules, including extra sections and related nonrevenue flights. (BTS4) (BTS5) (BTS6)

Scheduled Service: Transport service operated over an air carrier's routes, based on published flight schedules, including extra sections. (ATAB1) (FAA15)

Scheduled Service: Transport service operated over routes pursuant to published flight schedules which are openly advertised with dates or times (or both) or otherwise made readily available to the general public or pursuant to mail contracts with U.S. Postal services. (FAA11)

Scheduled Service: A scheduled commercial passenger vehicle trip. The scheduled trip is generally offered at preestablished times between designated locations. (FHWA2)

Scheduled Service: Total service scheduled computed from schedules. Scheduled service excludes service interruptions and special additional services. (FTA1)

School and Other Nonrevenue Bus: (See also Intercity Bus, Motor Bus, Motorbus, Transit Bus) Bus services for which passengers are not directly charged for transportation, either on a per passenger or per vehicle basis. (DOE6)

School Bus: See also Public School Transportation.

School Bus: A passenger motor vehicle which is designed or used to carry more than 10 passengers in addition to the driver, and which the Secretary [of Transportation] determines is likely to be significantly used for the purpose of transporting preprimary, primary, or secondary school students to such schools from home or from such schools to home. (49CFR390)

School Bus: Includes county school buses, private school buses, and buses chartered from private companies for the express purposes of carrying students to or from school and/or school-related activities. (FHWA3)

School Bus Hours: The vehicle hours of travel by a revenue vehicle while serving as a school bus. School bus hours are only hours where a bus is primarily or soley dedicated to carrying school passengers. (FTA1)

School Bus Operation: The use of a school bus to transport only school children and/or school personnel from home to school and from school to home. (49CFR390)

School Bus Related Crash: Any crash in which a vehicle, regardless of body design, used as a school bus is directly or indirectly involved, such as a crash involving school children alighting from a vehicle. (NHTSA3)

School Bus Service: The operation of buses exclusively to carry school passengers to and from their schools. (FTA1)

School Buses: Establishments primarily engaged in operating buses to transport pupils to and from school. School bus establishments operated by educational institutions should be treated as auxiliaries. (BOC1)

School Buses: Type I and Type II school vehicles as defined in Highway Safety Program Standard No. 17, used exclusively to transport school students, personnel, and equipment. (FTA1)

SCIA: Simultaneous Converging Instrument Approaches (FAA17)

SCOOT: Split Cycle and Offset Optimization Technique (FHWAII)

SCR: Shipboard Census Report (FHWA13)

Scrappage Rate: As applied to motor vehicles, it is usually expressed as the percentage of vehicles of a certain type in a given age class that are retired from use (lacking registration) in a given year. (DOE6)

SCSI: Small Computer System Interface (BTS)

SCUBA: Self Contained Underwater Breathing Apparatus

SDAT: Sector Design and Analysis Tool (FAA7)

SDF: Simplified Direction Finding (FAA7)

SDF: Standiford Field (FAA11)

SDR: Service Difficulty Report (FAA6)

SDRS: Standardized Delay Reporting System (FAA17)

SEA: Seattle - Tacoma International Airport (FAA11)

Sea Level Engine: A reciprocating aircraft engine having a rated takeoff power that is producible only at sea level. (14CFR1)

Sea-Bee Vessels: Ocean vessels constructed with heavy-duty submersible hydraulic lift or elevator system at the stern of the vessel. The Sea-Bee system facilitates forward transfer and positioning of barges. (MARAD2)

Sea-Land Barge: Barge designed as a container that can be moved directly from the inland waterway to a truck or train and then moved to destination. (TNDOT1)

Seabee: A type of barge carrying ship, similar to the LASH vessel except it employs a heavy-lift elevator at the stern-end of the ship to lift barges on and off. (MARAD1)

SEABEE: Sea Barge Carrying Ships (MARAD1) (MTMC1)

Seabee System: (See also Lighter-Aboard-Ship) Designed by Lykes Bros. Steamship Co., the system requires a SEABEE lighter or barge and a SEABEE carrier vessel or mother ship. The barges are 97.5 feet long and 35 feet side and have a hatch opening of 85 by 35 feet. The barges are moved down the inland waterway to the mother ship and brought on board by a 2,000-ton immersible elevator which is an integral part of the mother ship. Wheel dollies then transport the barges from the elevator to the point of rest on the ship. (TNDOT1)

Seaplane Base: Facility used primarily by seaplanes. (DOI3)

Seaplane Landing/Take-Off: Water area used for seaplanes landing and takeoff. (DOI3)

Search: The effort expended to locate a distressed unit by a reporting unit in terms of time and distance. (USCG3)

Search and Rescue (SAR): (See also SAR Facility) A service which seeks missing aircraft and assists those found to be in need of assistance. It is a cooperative effort using the facilities and services of available Federal, state, and local agencies. (FAA8)

Seat Offered Kilometer: Unit of measure representing the movement over one kilometer or one seat available in an Inland Waterways Transport (IWT) passenger vessel when performing the services for which it is primarily intended over one kilometer. (TNDOT1)

Seat-Miles: The aircraft miles flown in each inter-airport hop multiplied by the number of seats available on that hop for revenue passenger use. (FAA11)

Seating Capacity: The number of seats that are actually installed in the vehicle. (FTA1)

Seating Position: The location of the occupants in the vehicle. More than one can be assigned the same seat position; however, this is allowed only when a person is sitting on someone's lap. (NHTSA3)

Seating Reference Point (SGRP): The unique design H-point, as defined in Society of Automotive Engineers (SAE) J1100 (June 1984), which: 1) Establishes the rearmost normal design driving or riding position of each designated seating position, which includes consideration of all modes of adjustment, horizontal, vertical, and tilt in a vehicle; 2) Has X, Y, and Z coordinates, as defined in SAE J1100 (June 1984), established relative to the designed vehicle structure; 3) Simulates the position of the pivot center of the human torso and thigh; and 4) Is the reference point employed to position the two-dimensional drafting template with the 95th percentile leg described in SAE J826 (May 1987), or, if the drafting template with the 95th percentile leg cannot be positioned in the seating position, is located with the seat in its most rearward adjustment position. (49CFR571)

Second In Command: A pilot who is designated to be second in command of an aircraft during flight time. (14CFR1)

Secondary Airport: An airport receiving approach control service as a satellite to a primary approach control facility, or one at which control is exercised by the approach control facility under tower en route control procedure. (FAA14)

Secondary Separation Assurance: A backup to the primary means for maintaining aircraft separation. (FAA7)

Section 15: See National Transit Database.

Section Modulus: A measure of the strength of frame side rails, determined by the cross-section area and shape of the side rails. Section modulus is not affected by the material from which the side rail is made, only by the shape and position of the rail. (TII1) (TII2)

Sectional Aeronautical Charts: Designed for visual navigation of slow or medium speed aircraft. Topographic information on these charts features the portrayal of relief and a judicious selection of visual check points for Visual Flight Rules (VFR) flight. Aeronautical information includes visual and radio aids to navigation, airports, controlled airspace, restricted areas, obstructions and related data. (FAA4)

Sectionalizing Switch: A switch for disconnecting a section of a power line from the source of energy. (49CFR236)

Sector Suite (S/S): Refers to the composition of functions which directly comprise either the Controller or Sector Suite Console/Support processing elements. (FAA8)

Sector Suite Work Station: A group of consoles containing displays and input devices whereby Air Traffic Control (ATC) Specialists, Controllers or Supervisors interface with the ACF. (FAA8)

SECUTC: Southeastern Consortium of University Transportation Centers (MTMC1)

SED: Shipper's Export Document (FHWA13)

Self-Propelled Barge: Freight vessel having its own means of mechanical propulsion. (TNDOT1)

Self-Propelled Pusher Barge: Self-propelled barge designed or fitted to push pushed or pushed-towed barges. (TNDOT1)

Self-Propelled Pusher Tanker Barge: Self-propelled pusher barge for the bulk transport of liquids or gases. (TNDOT1)

Self-Propelled River-Sea Navigation Vessel: Inland Waterways Transport (IWT) freight vessel having a carrying capacity of at least 20 tons also designed for the transport of goods by sea and equipped with their own means of propulsion developing at least 37 kilowatts (KW). (TNDOT1)


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