RCLL . REDL . RLLS . RMK . RTS RTZL . RVR RWY . Runway Centerline Light Receive/Receiver Runway Lead-in Light System Remark Return to Service Runway Touchdown Zone Light(s) Runway Visual Range Runway S ............. SA . SAT SB SE SEC SFC SN . SR SS SSR SSW STD SUN SW . SWB South or southern latitude Sand Saturday Southbound Southeast Seconds Surface Snow Sunrise Sunset Secondary surveillance radar South-southwest Standard Sunday Southwest Southwest bound TAR TAX TDZ TEMPO . TFC Terminal area surveillance radar Taxing or taxiing Touchdown Zone Temporary or temporarily Traffic THR THU TKOF . TODA . TORA . TRG TUE TWR TWY . TX . Threshold Thursday Takeoff Take-off Distance Available Take-off Run Available Training Tuesday Aerodrome Control Tower Taxiway Taxilane U/S . UAS UNL UNREL . Unserviceable Unmanned Aircraft System Unlimited Unreliable VIS . VOR VORTAC VOT Visibility VHF Omni-Directional Radio Range VOR and TACAN (collocated) VOR Test Facility W ............ WB . WDI WED . WI . WID WIP WNW . WS . WSW . West or western longitude Westbound Wind Direction Indicator Wednesday Within Width or wide Work in progress West-northwest Wind shear West-southwest 5-1-4. Operational Information System (OIS) a. The FAA"s Air Traffic Control System Command Center (ATCSCC) maintains a website with near real-time National Airspace System (NAS) status information. NAS operators are encouraged to access the website at http://www.fly.faa.gov prior to filing their flight plan. b. The website consolidates information from advisories. An advisory is a message that is disseminated electronically by the ATCSCC that contains information pertinent to the NAS. 1. Advisories are normally issued for the following items: (a) Ground Stops. (b) Ground Delay Programs. (c) Route Information. (d) Plan of Operations. (e) Facility Outages and Scheduled Facility Outages. (f) Volcanic Ash Activity Bulletins. (g) Special Traffic Management Programs. 2. This list is not all-inclusive. Any time there is information that may be beneficial to a large number of people, an advisory may be sent. Additionally, there may be times when an advisory is not sent due to workload or the short length of time of the activity. 3. Route information is available on the website and in specific advisories. Some route information, subject to the 56-day publishing cycle, is located on the "OIS" under "Products," Route Management Tool (RMT), and Preflight 5-1-9