Prior to entering Whiting Class-C airspace, which elements are included in the TBAST sequence?

• A. TAWS/Traffic Audio, Base, ATIS, Squawk, Tower; Prior to entering Whiting Class-C airspace.
• B. TAWS/Traffic Advisory, Base, ATIS, Squawk; Upon departure
• C. Traffic Broadcast and Surveillance; Before takeoff
• D. Tower, Base, ATIS, Squawk, TAWS; After entering airspace

Answer: (A)

Entering Whiting Class-C airspace relies on a pre-entry sequence that ensures you’re aware of traffic, properly positioned, informed about current conditions, identifiable on radar, and coordinated with ATC. The sequence begins with TAWS or Traffic Audio so you can hear and anticipate other aircraft and terrain, giving you immediate situational awareness. Next comes establishing the base leg in the pattern, which helps you align for a safe, predictable entry path. Then you obtain the latest information via ATIS, so you know weather, winds, altimeter, and runway—crucial for planning and safe operation. After that, you set a discrete transponder code (squawk) to enable ATC to identify and track you on radar. Finally, you contact Tower to receive entry instructions and clearance into the Class-C airspace. This order maximizes safety and compliance by ensuring traffic awareness, correct pattern position, current information, radar identification, and explicit ATC coordination before you cross the boundary.