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S/DBE: Small and Disadvantaged Business Enterprise (FTA5)

S/S: Sector Suite (FAA20)

SA: Selective Availability (BTS10)

SA: System Administrator (FAA20)

SA: Shipyard Agreement (MARAD4)

SAA: Senior Associate Administrator (NHTSA7)

SAAM: Special Assignment Airlift & Mission (MTMC1)

SAB: Side Air Bag (NHTSA7)

SAC: Strategic Air Command (FAA20)

SAC: Structures Advisory Council (FHWA18)

SAC: Suburban Activity Center (FHWA19)

SADC: Southern African Development Community (FHWA20)

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

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)

SaDIP: Safety Data Improvement Program (FMCSA1)

SAE: Society of Automotive Engineers (FHWA18)

SAFER: Special Aviation Fire and Explosion Reduction (BTS10)

SAFER: Safety and Fitness Electronic Records System (FHWA15)

SAFETEA: Safe, Accountable, Flexible & Efficient Transportation Equity Act of 2005 (NHTSA7)

SAFETEA-LU: Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (DOT1)

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)

Safety Management System: A systematic process that has the goal of reducing the number and severity of transportation related accidents by ensuring that all opportunities to improve safety are identified, considered and implemented as appropriate. (FHWA21)

SafetyX Power: Exponential Safety Power (FMCSA1)

SAFI: Semi Automatic Flight Inspection (FAA20)

SAGA: System Safety Approach for General Aviation (FAA20)

SAI: Safety Attribute Inspection (FAA20)

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: 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 Lighting System (FAA20)

SAM: South American Region (USTTA1)

SAMIS: Safety Management Information Statistics (BTS11)

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)

Sampling Error: The estimated inaccuracy of the results of a study when a population sample, rather than a census, is used to explain the behavior of the total population. (Also referred to as margin of error and standard error.) (BTS11)

SAMS: Special Use Airspace Management System (FAA20)

SAMS/MAMS: Special Airspace Management System (FAA7)

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

SAN: Storage Area Network (FAA20)

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

SANPRM: Supplemental Advance Notice of Proposed Rulemaking (RSPA1)

SAP: Sampling and Analysis Plan (FHWA18)

SAP: Substance Abuse Program (NHTSA7)

SAPS: Staffing and Personnel System (FAA20)

SAR: Search and Rescue (FAA20)

SAR Facility: 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)

SARA: Superfund Amendments and Reauthorization Act (FHWA18)

SARMIS: Search and Rescue Management Information System (BTS7)

SARP: Standards and Recommended Practices (FAA20)

SARSAT: Search and Rescue Satellite (FAA8)

SAS: Statement on Auditing Standards (DOT1)

SAS: Scandinavian Airlines System (FAA18)

SAS: Safety Assurance System (FAA20)

SAS: Statistical Analysis System (FHWA18)

SAS: Special Airlift Summary (MTMC1)

SAS: Statistical analysis software produced by SAS Institute, Inc. (NHTSA7)

SASHTO: Southeastern Association of State Highway and Transp. Officials (FHWA19)

SASO: System Approach for Safety Oversight (FAA20)

SAT: San Antonio International Airport (FAA11)

SAT: Security, Awareness, and Training System (FAA20)

SAT: SEOAT Analytical Team (FAA20)

SATCOM: Satellite Communications (FAA20)

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)

SAVE: Society of American Value Engineers (FTA5)

SAVE: System for the Effective Assessment of the Driver State and Vehicle Control in Emergency Situations (NHTSA7)

SAVE-IT: Safety Vehicle Using Adaptive Interface Technology (NHTSA7)

SAVES: Strategic Sourcing for the Acquisition of Various Equipment and Supplies (FAA20)

SAW: Surface Acoustic Wave (FHWA19)

SAWRS: Supplemental Aviation Weather Reporting Service (FAA20)

SBA: Small Business Administration (FHWA18)

SBGP: State Block Grant Program (FAA20)

SBI: Screening and Brief Intervention (NHTSA7)

SBIR: Small Business Innovation Research (FAA20)

SBIRT: Screening, Brief Intervention and Referral to Treatment (NHTSA7)

SBL: Secondary Belt Law (NHTSA7)

SBR: Statement of Budgetary Resources (NHTSA7)

SBRP: Special Bridge Replacement Program - 1970 (MTMC1)

SBS: Surveillance Broadcast Services (FAA20)

SBT: Scenario Based Training (FAA20)

SBT: Segregated Ballast Tanks (FHWA12)

SC: Safety Certification (FTA5)

SC: Safe Communities (NHTSA7)

SCA: Statement of Custodial Activity (DOT1)

SCAC: Standard Carrier Alpha Code (FMCSA2)

SCADA: Supervisory Control and Data Acquisition (FAA20)

SCAP: System Certification and Accreditation Package (FAA20)

SCAT: Staffing and Cost Analysis Tool (FAA20)

SCATS: Sydney Coordinated Adaptive Traffic System (FHWA15)

SCC: System Command Center (FAA20)

SCCTD: Santa Clara County Transit District (FTA5)

SCD: Steering Control Devices (NHTSA7)

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)


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