Cle local controller providing OJT described a conflict between two successive departure aircraft wh...

Attributes
ACN	864912
Time
Date	200912
Local Time Of Day	1801-2400
Place
Locale Reference	CLE.Tower
State Reference	OH
Aircraft 1
Make Model Name	Light Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict

Narrative:

Aircraft 2 was assigned heading 280 climbing to 5000 switched to departure radar. Trainee assigned heading 280 and climb to 5000 to aircraft 1; which put # 1 about 2 miles behind #2 with greater climb rate on #1. Visual separation was applied at this time as #1 was still on tower frequency. Trainee asked #1 if he had #2 in sight; pilot said 'negative'. Aircraft#1 was assigned 15 degree turn to establish diverging courses; but; in all likelihood; radar separation; nor diverging courses; were established when #1 aircraft was switched to departure (discontinuance of tower controller's visual separation). Recommendation; as instructor; I should better know the student's level of experience. I should have foreseen the upcoming error and issued appropriate instructions myself and discussed the rules with the student later.

Original NASA ASRS Text

Title: CLE local controller providing OJT described a conflict between two successive departure aircraft when the developmental failed to insure separation; adding that he/she should have taken the position sooner.

Narrative: Aircraft 2 was assigned heading 280 climbing to 5000 switched to departure radar. Trainee assigned heading 280 and climb to 5000 to Aircraft 1; which put # 1 about 2 miles behind #2 with greater climb rate on #1. Visual separation was applied at this time as #1 was still on Tower frequency. Trainee asked #1 if he had #2 in sight; pilot said 'negative'. Aircraft#1 was assigned 15 degree turn to establish diverging courses; but; in all likelihood; RADAR separation; nor diverging courses; were established when #1 aircraft was switched to departure (discontinuance of Tower Controller's visual separation). Recommendation; as instructor; I should better know the student's level of experience. I should have foreseen the upcoming error and issued appropriate instructions myself and discussed the rules with the student later.

Data retrieved from NASA's ASRS site as of April 2012 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.

Cle local controller providing OJT described a conflict between two successive departure aircraft when the developmental failed to insure separation; adding that he/she should have taken the position sooner.