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RCLL  .   Runway Centerline Light
REDL  .   Runway Edge Light
RLLS  .   Runway Lead

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in Light System

RMK   .   Remark
RTS     Return to Service
RTZL  .   Runway Touchdown Zone Light(s)
RVR    Runway Visual Range
RWY   .   Runway
RX   .   Receive/Receiver

S  .   South

or

southern latitude

SA   .   Sand
SAT     Saturday
SB    Southbound
SE    Southeast
SEC     Seconds
SFC     Surface
SN   .   Snow
SR    Sunrise
SS    Sunset
SSR     Secondary surveillance radar
SSW    South

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southwest

STD     Standard
SUN    Sunday
SW  .   Southwest
SWB    Southwest bound

TAR    Terminal area surveillance radar
TAX    Taxing

or

 taxiing

TDZ    Touchdown Zone
TEMPO  .   Temporary

or

 temporarily

TFC     Traffic

THR    Threshold
THU    Thursday
TKOF  .   Takeoff
TODA  .   Take

-

off Distance Available

TORA  .   Take

-

off Run Available

TRG    Training
TUE    Tuesday
TWR    Aerodrome Control Tower
TWY   .   Taxiway
TX   .   Taxilane

U/S  .   Unserviceable
UAS    Unmanned Aircraft System
UNL    Unlimited
UNREL  .   Unreliable

VIS  .   Visibility
VOR    VHF Omni-Directional Radio Range
VORTAC    VOR and TACAN (collocated)
VOT    VOR Test Facility

W    West

 or

 western longitude

WB  .   Westbound
WDI    Wind Direction Indicator
WED   .   Wednesday
WI   .   Within
WID    Width

or

 wide

WIP     Work in progress
WNW  .   West

-

northwest

WS  .   Wind shear
WSW  .   West

-

southwest

-

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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 [1]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.

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.

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.

Preflight

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-

References

1. http://www.fly.faa.gov/