TWDL

(1) Two Way Data Link. (2) In this mode the DME transmits a reduced pulse pair rate after acquiring lock-on (DME). (3) Terminal Weather Data Link. (4) Thrust Asymetry Compensation. (5) Thrust Reduction Altitude. (6) To Be Specified. (7) Traffic Management System. (8) Transceiver (see RT). (9) True. (10) True Air Temperature. (11) Estimated poisition and velocity of a single aircraft based on correlated surveillance data reports (TCAS). (12) Receiver - Transmitter.