Narrative:

Received TCASII TA at FL330. ATC instructed us to turn left 30 degrees. Next received RA to descend. We followed TCASII command bars and observed F15 in trouble from left to right descending through our previous altitude. Later we called ZAB supervisor and he confirmed that the F15 declared emergency and had to descend from FL390 to lower altitude. TCASII worked normally and no one hurt. We descended to FL310 and after RA climbed back to FL330. Operations normal.

Google
 

Original NASA ASRS Text

Title: AN ACR FLT RECEIVES AND ACTS UPON A TCASII RA TO AVOID A DSNDING F15 IN EMER DSCNT.

Narrative: RECEIVED TCASII TA AT FL330. ATC INSTRUCTED US TO TURN L 30 DEGS. NEXT RECEIVED RA TO DSND. WE FOLLOWED TCASII COMMAND BARS AND OBSERVED F15 IN TROUBLE FROM L TO R DSNDING THROUGH OUR PREVIOUS ALT. LATER WE CALLED ZAB SUPVR AND HE CONFIRMED THAT THE F15 DECLARED EMER AND HAD TO DSND FROM FL390 TO LOWER ALT. TCASII WORKED NORMALLY AND NO ONE HURT. WE DSNDED TO FL310 AND AFTER RA CLBED BACK TO FL330. OPS NORMAL.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.