Narrative:

C208 departed runway 14 assigned heading 120 degrees. Turbojet departed runway 10L immediately after C208, assigned heading 100 degrees. Strong south wind took C208 north of expected course. (Aircraft were visual from the tower.) turbojet received a TCASII RA due to close proximity of C208 even though 20 degree course divergence separation existed. Situation was aggravated by 2 factors: 1) trainee was working position and did not instantly recognize close proximity of subject aircraft. 2) first departure period of the day and neither I nor the trainee was aware of the strong south wind at 3000 ft (surface winds were calm).

Google
 

Original NASA ASRS Text

Title: CTLR TRAINING IN PROGRESS. A C208 WAS CLBING OFF RWY 14 ON AN ASSIGNED HDG OF 120 DEGS, AN ACR WAS CLRED OFF RWY 10C TO CLB ON A 100 DEG HDG. THE ACR RECEIVED A TCASII RA AND RESPONDED DUE TO THE C208 BEING BLOWN OFF COURSE. TWR HAD 20 DEGS OF DIVERGENCE AND RPTR SAID THEY HAD VISUAL ON BOTH ACFT, BUT POTENTIAL CONFLICT LTSS WAS INCURRED. RPTR ADMITS NEITHER CTLR WAS AWARE OF THE STRONG S WIND THAT EXISTED AT 3000 FT.

Narrative: C208 DEPARTED RWY 14 ASSIGNED HDG 120 DEGS. TURBOJET DEPARTED RWY 10L IMMEDIATELY AFTER C208, ASSIGNED HDG 100 DEGS. STRONG S WIND TOOK C208 N OF EXPECTED COURSE. (ACFT WERE VISUAL FROM THE TWR.) TURBOJET RECEIVED A TCASII RA DUE TO CLOSE PROX OF C208 EVEN THOUGH 20 DEG COURSE DIVERGENCE SEPARATION EXISTED. SIT WAS AGGRAVATED BY 2 FACTORS: 1) TRAINEE WAS WORKING POS AND DID NOT INSTANTLY RECOGNIZE CLOSE PROX OF SUBJECT ACFT. 2) FIRST DEP PERIOD OF THE DAY AND NEITHER I NOR THE TRAINEE WAS AWARE OF THE STRONG S WIND AT 3000 FT (SURFACE WINDS WERE CALM).

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.