Controller training in progress. A C208 was climbing off runway 14 on an assigned heading of 120 degrees, an air carrier was cleared off runway 10C to climb on a 100 degree heading. The air carrier received a TCASII RA and responded due to the C208 being blown off course. Tower had 20 degrees of divergence and reporter said they had visual on both aircraft, but potential conflict less than standard separation was incurred. Reporter admits neither controller was aware of the strong south wind that existed at 3000 ft.

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Attributes
ACN	359757
Time
Date	199702
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit tower : pit
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Caravan 1 208A
Operating Under FAR Part	Part 135
Flight Phase	climbout : initial climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	359757
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

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).

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.