Narrative:

I was training a radar developmental on arrival/departure west. The controller working the handoff position had coordinated a non standard departure heading for 2 aircraft and didn't tell us. Corp X was being vectored for a visibility approach to runway 32 at 4000'. Commuter Y departed runway 32 and turned left as assigned to heading 180 degrees climbing to 3000'. A previous non standard departure had departed 2 mins earlier and had our attention. Aircraft Y was radar idented and instructed to climb to 6000' and to expedite climb. I thought that aircraft Y type in the climb would be much slower than corp X on vectors at 4000', but X had already reduced to its approach speed. I instructed the trnee to turn X to a 140 degree heading from its assigned heading of 110 degrees. That was not enough to ensure sep, so I overrode the frequency and turned Y right to 230 degrees to pass behind X. I should have acted sooner, but I thought it might have worked, especially if X was flying a normal expected downwind speed. Also, had the handoff controller informed us of the game plan we wouldn't have been caught off guard. Traffic at the time was moderate. Our radar is the tpx-42, which is non programmable and doesn't have C/a or ground speed, both of which would have been a big help. Both aircraft were on IFR flight plans and deserved better service than this.

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Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN CORP JET ARR AND COMMUTER DEP. OPERATIONAL ERROR.

Narrative: I WAS TRNING A RADAR DEVELOPMENTAL ON ARR/DEP W. THE CTLR WORKING THE HDOF POS HAD COORDINATED A NON STANDARD DEP HDG FOR 2 ACFT AND DIDN'T TELL US. CORP X WAS BEING VECTORED FOR A VIS APCH TO RWY 32 AT 4000'. COMMUTER Y DEPARTED RWY 32 AND TURNED LEFT AS ASSIGNED TO HDG 180 DEGS CLBING TO 3000'. A PREVIOUS NON STANDARD DEP HAD DEPARTED 2 MINS EARLIER AND HAD OUR ATTN. ACFT Y WAS RADAR IDENTED AND INSTRUCTED TO CLB TO 6000' AND TO EXPEDITE CLB. I THOUGHT THAT ACFT Y TYPE IN THE CLB WOULD BE MUCH SLOWER THAN CORP X ON VECTORS AT 4000', BUT X HAD ALREADY REDUCED TO ITS APCH SPD. I INSTRUCTED THE TRNEE TO TURN X TO A 140 DEG HDG FROM ITS ASSIGNED HDG OF 110 DEGS. THAT WAS NOT ENOUGH TO ENSURE SEP, SO I OVERRODE THE FREQ AND TURNED Y RIGHT TO 230 DEGS TO PASS BEHIND X. I SHOULD HAVE ACTED SOONER, BUT I THOUGHT IT MIGHT HAVE WORKED, ESPECIALLY IF X WAS FLYING A NORMAL EXPECTED DOWNWIND SPD. ALSO, HAD THE HDOF CTLR INFORMED US OF THE GAME PLAN WE WOULDN'T HAVE BEEN CAUGHT OFF GUARD. TFC AT THE TIME WAS MODERATE. OUR RADAR IS THE TPX-42, WHICH IS NON PROGRAMMABLE AND DOESN'T HAVE C/A OR GND SPD, BOTH OF WHICH WOULD HAVE BEEN A BIG HELP. BOTH ACFT WERE ON IFR FLT PLANS AND DESERVED BETTER SVC THAN THIS.

Data retrieved from NASA's ASRS site as of August 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.