Tower controller described a conflict event between two successive IFR departure aircraft during red...

Attributes
ACN	1008052
Time
Date	201205
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	Caravan 208A
Operating Under FAR Part	Part 135
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Instructor Local
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Supervisor / CIC
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

The following occurred while providing OJT in solid IFR conditions. A caravan was cleared for an intersection take off from runway xxl at taxiway south. Pilot was instructed to make a close right turn heading 030; and to advise when established on the assigned heading. Pilot was also informed of traffic holding in position; with additional traffic on final. Asde-X display indicated aircraft in a right turn. After the caravan reported on the 030 heading; an MD80 was instructed to fly runway heading and cleared for take-off runway xxl; full length. By this time; the asde-X tag for the caravan dropped; further indicating aircraft was on assigned heading. While the MD80 was on take off roll or possibly airborne; asde-X tag for the caravan reacquired and appeared to be moving in a northwest direction towards the xxl departure end. A partial data block was then acquired on the d-brite very close off the departure end of runway xxl. The MD80 was then instructed to make an immediate left turn heading 300.

Original NASA ASRS Text

Title: Tower Controller described a conflict event between two successive IFR departure aircraft during reduced visibility when the first aircraft failed to turn as cleared. A supervisory report on the event provided an additional perspective.

Narrative: The following occurred while providing OJT in solid IFR conditions. A Caravan was cleared for an intersection take off from Runway XXL at Taxiway S. Pilot was instructed to make a close right turn heading 030; and to advise when established on the assigned heading. Pilot was also informed of traffic holding in position; with additional traffic on final. ASDE-X display indicated aircraft in a right turn. After the Caravan reported on the 030 heading; an MD80 was instructed to fly runway heading and cleared for take-off Runway XXL; full length. By this time; the ASDE-X tag for the Caravan dropped; further indicating aircraft was on assigned heading. While the MD80 was on take off roll or possibly airborne; ASDE-X tag for the Caravan reacquired and appeared to be moving in a northwest direction towards the XXL departure end. A partial Data Block was then acquired on the D-BRITE very close off the departure end of Runway XXL. The MD80 was then instructed to make an immediate left turn heading 300.

Data retrieved from NASA's ASRS site as of July 2013 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.

Tower controller described a conflict event between two successive IFR departure aircraft during reduced visibility when the first aircraft failed to turn as cleared. A supervisory report on the event provided an additional perspective.