background image

AIM 

6/17/21 

terrain, or obstructions after an RA maneuver until 
one of the following conditions exists: 

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

12 

ATC Clearances and Aircraft Separation