1. EATMP HMI TCAS RA DRAFT 11 December 2002
Eurocontrol Human Machine Interface Service

2. Principles TCAS HMI must be consistent with current EATMP HMI.
There might be a need to combine some of the TCAS warnings for simplicity.
Usefulness of particular warnings must be examined.
Voice prompts are introduced to increase controller’s alertness.
For clarity, TCAS warning examples are shown without STCA or MTCD warnings. Flight levels are shown for illustration purposes only.

3. Voice Prompts Types Voice – alert announced once, female voice
Voice plus – alert announced twice, higher volume, male voice

4. Voice Prompts
TCAS – “voice plus” announced once immediately after alert is generated, repeated only if RA sense is reversed; suppresses STCA voice announcements for that conflict
STCA – “voice” announced once immediately after STCA is generated, “voice plus” announced after 15 sec., repeated every 15 sec. until clear of conflict

5. Existing HMI Normal Situation
BAW362 NS
330

6. Existing HMI MTCD Warning
BAW NS
330

7. Existing HMI MTCD and STCA Warnings
BAW NS
330

8. MTCD, STCA and TCAS RA
TCAS 
BAW NS
330

9. MTCD and TCAS RA (no STCA)
BAW NS
330

10. TCAS RA with direction indication (no STCA and MTCD)
BAW NS
330

11. TCAS RA Alternative solution RA in Line O
BAW NS
330
Considerations:
STCA and TCAS are anagrams - might be confusing under stress
For that reason displaying “RA” instead of “TCAS” in line 0 might be better
However, “RA” will inconsistent with ATC phraseology (“TCAS descend/climb”)

12. TCAS RA Alternative solution No RA type
BAW NS
330
No indication of RA type given

13. All VSLs TCAS VSL BAW362 NS 325  330 TCAS - All VSLs:
Monitor vertical speed
Adjust vertical speed, adjust
Maintain vertical speed, maintain
Maintain vertical speed, crossing maintain

14. Descend
TCAS 
BAW NS
330
TCAS: Descend, descend

15. Crossing descend TCAS X BAW362 NS 330
TCAS: Descend, crossing descend…
Consideration:
Controllers may associate the word crossing with crossing tracks.

16. Climb
TCAS 
BAW NS
330
TCAS: Climb, climb

17. Crossing climb TCAS X BAW362 NS 330 TCAS: Climb, crossing climb…
Consideration:
Controllers may associate the word crossing with crossing tracks.

18. Increase descend TCAS   BAW362 NS 324  330
TCAS: Increase descend, increase descend

19. Increase climb TCAS   BAW362 NS 335  330
TCAS: Increase climb, increase climb

20. Descend NOW (reverse sense RA)
TCAS
BAW NS
335  330
TCAS: Descend, descend NOW

21. Descend NOW (reverse sense RA) Alternative Solution - different icon
BAW NS
335  330
TCAS () 
TCAS: Descend, descend NOW
Alternative solution - if the icon on the previous slide cannot be implemented.

22. Climb NOW (reverse sense RA)
TCAS
BAW NS
324  330
TCAS: Climb, climb NOW

23. Climb NOW (reverse sense RA) Alternative Solution - different icon
TCAS ()  BAW NS
324  330
TCAS: Climb, climb NOW
Alternative solution - if the icon on the previous slide cannot be implemented.

24. Intruder with no TCAS, no RA generated or TCAS in TA mode only
LOT467 NS
330
TCAS 
BAW NS
330
Intruder with no TCAS, no RA generated or TCAS in TA mode only
Consideration:
Controllers have no means knowing which aircraft are not TCAS equipped or TCAS in-op.

25. Clear of Conflict
TCAS CLEAR
BAW362 NS
330
TCAS: Clear of conflict

26. Alert Window
TCAS LOT282  SAS751 