Line 1 of the tower cab LLWAS display panel shows averaged Airport Wind (AW), _______________ and audible alarm status. Which time standard is used?

• A. Pacific Standard Time
• B. Coordinated Universal Time
• C. Greenwich Mean Time
• D. Local Time

Answer: (B)

The main idea here is using a single, universal time reference in aviation displays so everyone in the system talks about the same moment no matter where they are. In aviation, that reference is Coordinated Universal Time, which pilots and controllers often call UTC or Zulu time. Using UTC on the LLWAS display means the averaged Airport Wind value, the time reference, and the audible alarm status all line up with other ATC and weather systems worldwide, avoiding confusion from time zones or daylight saving.

Local times like Pacific Standard Time depend on location and can change with seasons, so they’re not suitable for a global, standardized display. Greenwich Mean Time is an older term that corresponds to UTC but today the standard term used in aviation is UTC. Local Time would vary by site, defeating the purpose of a consistent reference. So the time standard used is Coordinated Universal Time.