Aviation Maintenance Terms beginning with T

TA

Traffic Advisory (TCAS II)

TAS

Traffic Advisory System

TC

Type Certificate

TCAS

Traffic Alert and Collision Avoidance System

TCAS II

The second and current generation of instrument warning TCAS. It offers all the benefits of TCAS I, but also offers the pilot direct, vocalized instructions to avoid danger, known as a "Resolution Advisory" (RA). TCAS II systems coordinate their resolution advisories before issuing commands to the pilots, so that if one aircraft is instructed to descend, the other will typically be told to climb — maximizing the separation between the two aircraft.

TIS-B

Traffic Information Service - Broadcast

TOM

Time of Measurement

TSO

Technical Standard Order

TSOA

Technical Standard Order Authorization