ZMP controller while instructing has an aircraft climbing faster than previous aircraft; development...

Attributes
ACN	1232230
Time
Date	201501
Local Time Of Day	1801-2400
Place
Locale Reference	ZMP.ARTCC
State Reference	MN
Environment
Light	Night
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport Low Wing 2 Turboprop Eng
Flight Phase	Cruise Initial Climb
Route In Use	SID ZMBRO
Flight Plan	IFR
Person 1
Function	Instructor Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 7
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Narrative:

I was the instructor providing ojti at sector 21. I had not trained with developmental in a week or two and was told he was ready for certification. Faster jet traffic was climbing out behind aircraft Y traffic on the zmbro departure. Aircraft Y's final altitude was FL230 and they were cleared to it. Developmental 'got higher' for the aircraft X jet to make sure they kept climbing through FL230 and did not level. As aircraft X was approaching FL230 climbing he transferred communications to the next sector before ensuring separation. I did not react fast enough and could not stop the frequency change. The next sector issued a slight turn and aircraft X ended up topping aircraft Y by 1000 ft with not much room to spare. Always make sure you are ready to step in as an instructor and take the frequency. Your developmental may just do the dumbest thing possible at any time. A turn further to the right should have been issued to aircraft X jet sooner and none of this would have been a problem.

Original NASA ASRS Text

Title: ZMP Controller while instructing has an aircraft climbing faster than previous aircraft; Developmental gives higher for faster climbing aircraft. Developmental transfers communication on faster climbing aircraft before separation is ensured.

Narrative: I was the instructor providing OJTI at sector 21. I had not trained with developmental in a week or two and was told he was ready for certification. Faster jet traffic was climbing out behind Aircraft Y traffic on the ZMBRO departure. Aircraft Y's final altitude was FL230 and they were cleared to it. Developmental 'Got higher' for the Aircraft X jet to make sure they kept climbing through FL230 and did not level. As Aircraft X was approaching FL230 climbing he transferred communications to the next sector before ensuring separation. I did not react fast enough and could not stop the frequency change. The next sector issued a slight turn and Aircraft X ended up topping Aircraft Y by 1000 FT with not much room to spare. Always make sure you are ready to step in as an instructor and take the frequency. Your developmental may just do the dumbest thing possible at any time. A turn further to the right should have been issued to Aircraft X jet sooner and none of this would have been a problem.

Data retrieved from NASA's ASRS site 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.

ZMP controller while instructing has an aircraft climbing faster than previous aircraft; developmental gives higher for faster climbing aircraft. Developmental transfers communication on faster climbing aircraft before separation is ensured.