Question

What does the "T221" mean on the V149 airway?

1) It is the Terminal Route 221, which is only used when flying into Class B airports.
2) An airway number preceded by a "T" means it is an RNAV route.
3) It is a special route used by helicopters and fixed wing aircraft.
4) On T221, just west of Mount Pocono airport, it is 4,000 feet to the ground if you are at the MEA.

Answer 1

The 'T221' on the V149 airway indicates that it is an RNAV route, which allows aircraft to fly on any desired path within navigation aid coverage and it's not specific to Class B airports or certain types of aircraft. The altitude reference near Mount Pocono is unrelated.

Step-by-step explanation:

The 'T221' on the V149 airway indicates that it is an RNAV route, which allows aircraft to fly on any desired path within navigation aid coverage and it's not specific to Class B airports or certain types of aircraft. The altitude reference near Mount Pocono is unrelated. The designation "T221" on the V149 airway represents an RNAV route. RNAV stands for Area Navigation, which is a method of navigation that allows an aircraft to fly on any desired flight path within the coverage of ground- or space-based navigation aids, within the limits of the capability of the self-contained systems, or a combination of both.

The 'T' in T221 indicates that it's an RNAV route specific to aircraft with that navigation capability, and it is not limited to Class B airports nor is it a special route used exclusively by helicopters and fixed-wing aircraft. In addition, the given statement about the altitude in relation to Mount Pocono airport is not relevant to the meaning of T221.