AIM 

4/20/23 

1. 

The aircraft has returned to its assigned altitude and course. 

2. 

Alternate ATC instructions have been issued. 

3. 

A crew member informs ATC that the TCAS maneuver has been completed. 

NOTE

−

 

TCAS does not alter or diminish the pilot’s basic authority and responsibility to ensure safe flight. Since TCAS does not 

respond to aircraft which are not transponder equipped or aircraft with a transponder failure, TCAS alone does not ensure 

safe separation in every case. At this time, no air traffic service nor handling is predicated on the availability of TCAS 

equipment in the aircraft. 

4

−

4

−

17.  Traffic Information Service (TIS) 

a. 

TIS provides proximity warning only, to assist the pilot in the visual acquisition of intruder aircraft. No 

recommended avoidance maneuvers are provided nor authorized as a direct result of a TIS intruder display or 

TIS alert. It is intended for use by aircraft in which TCAS is not required. 

b. 

TIS does not alter or diminish the pilot’s basic authority and responsibility to ensure safe flight. Since TIS 

does not respond to aircraft which are not transponder equipped, aircraft with a transponder failure, or aircraft 

out of radar coverage, TIS alone does not ensure safe separation in every case. 

c. 

At this time, no air traffic service nor handling is predicated on the availability of TIS equipment in the 

aircraft. 

d. 

Presently, no air traffic services or handling is predicated on the availability of an ADS

−

B cockpit display. 

A “traffic

−

in

−

sight” reply to ATC must be based on seeing an aircraft out

−

the

−

window, NOT on the cockpit 

display. 

4

−

4

−

14 

ATC Clearances and Aircraft Separation