Approach controller; providing on the job training; described separation event at 3000 ft; when stud...

Attributes
ACN	834678
Time
Date	200905
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Military Transport
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Military Transport
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	Approach Departure Instructor
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Non Radar 5.5 Air Traffic Control Radar 14.5 Air Traffic Control Time Certified In Pos 1 (yrs) 12
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict
Miss Distance	Horizontal 10560 Vertical 0

Narrative:

I am a fully certified air traffic control specialist that was providing on-the-job training to a developmental (trainee) with no previous radar experience. Aircraft X departs military base on runway heading to the southwest and contacts departure climbing to 3;000. Aircraft X requests IFR approaches at nearby civilian airport which is about a dozen miles to the southeast. Trainee turns aircraft X left to a heading of 090. Aircraft X makes a sharp turn to the east. Aircraft Y departs military base on same heading also climbing rapidly to 3;000. The climb of aircraft Y is so rapid that it comes within 2 miles of aircraft X both now level at 3;000. Evasive vectors and traffic alerts are issued. Aircraft X reports aircraft Y in sight and is told to maintain visual separation. In retrospect; I should have advised the trainee to let aircraft X run to the south for just a mile or so before starting the turn to the east. Most of the time; the departures off of the military base climb slowly and turn at a standard rate; so this is not usually a factor; but this time was the exception; and proved to be a valuable learning experience for the developmental (and for me).

Original NASA ASRS Text

Title: Approach Controller; providing on the job training; described separation event at 3000 FT; when Student Controller working two military aircraft issued early turn; resulting in a conflict.

Narrative: I am a fully certified Air Traffic Control Specialist that was providing on-the-job training to a Developmental (trainee) with no previous radar experience. Aircraft X departs military base on runway heading to the southwest and contacts departure climbing to 3;000. Aircraft X requests IFR approaches at nearby civilian airport which is about a dozen miles to the southeast. Trainee turns Aircraft X left to a heading of 090. Aircraft X makes a sharp turn to the east. Aircraft Y departs military base on same heading also climbing rapidly to 3;000. The climb of Aircraft Y is so rapid that it comes within 2 miles of Aircraft X both now level at 3;000. Evasive vectors and traffic alerts are issued. Aircraft X reports Aircraft Y in sight and is told to maintain visual separation. In retrospect; I should have advised the trainee to let Aircraft X run to the south for just a mile or so before starting the turn to the east. Most of the time; the departures off of the military base climb slowly and turn at a standard rate; so this is not usually a factor; but this time was the exception; and proved to be a valuable learning experience for the developmental (and for me).

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.

Approach controller; providing on the job training; described separation event at 3000 ft; when student controller working two military aircraft issued early turn; resulting in a conflict.