What does a trouble T indicate in an approach procedure?

A trouble T indicates that there are non-standard takeoff (T/O) minimums or that a departure procedure exists for that approach procedure. This symbol is used to alert pilots that they should be aware of specific requirements that differ from standard operations. Non-standard takeoff minimums often arise due to factors like obstacles in the flight path or other safety considerations, and the associated departure procedure will provide guidance on how to safely take off given those considerations. By recognizing the trouble T, pilots can ensure they are following the correct protocols and minimizing risks associated with their departure, leading to safer flight operations.