Atx Y overtook small aircraft X after departure resulting in less than standard separation.

Attributes
ACN	113691
Time
Date	198906
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mht
State Reference	NH
Altitude	msl bound lower : 3000 msl bound upper : 3100
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mht
Operator	common carrier : air taxi
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	113691
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 9000 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

At approximately XX30, tower requested headings for successive departures on runway 35. I approved headings 290 through 060. Tower released an small aircraft heading 060 degree, 2 mi in trail an small aircraft on heading 030 degree, and a third small aircraft X on heading 360 degree, all climbing to 3000'. None of the 3 small aircraft's automatically 'acquired'. Meanwhile, I advised my flight data man to force the 3 small aircraft's into the ARTS and finally I had him manually 'dm' the aircraft in the fdio. While he was doing that, I had manually coordinated with psm approach on the small aircraft's. The first small aircraft I left on the 060 degree heading for ene and climbed him to 9000. The second small aircraft, using divergence, was turned to 090 degree heading, vectors to intercept V106 and climbed to 7000. The third small aircraft X was turned to a 120 degree heading climbing to 5000' when he was 3 miles north of the runway. Local had released atx Y on a 060 degree heading climbing to 3000. I was coordinating handing off with psm approach about the small aircraft's and missed atx Y's 'check-on'. Seconds later atx Y 'acquired' at 3000'. I immediately issued a traffic alert to the small aircraft X and turned him 090 degree to maintain 3000. I then issued an immediate climb to 5000 and a 140 degree heading to atx Y. There was 100' and 1 1/2 mi separation.

Original NASA ASRS Text

Title: ATX Y OVERTOOK SMA X AFTER DEP RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: AT APPROX XX30, TWR REQUESTED HDGS FOR SUCCESSIVE DEPS ON RWY 35. I APPROVED HDGS 290 THROUGH 060. TWR RELEASED AN SMA HDG 060 DEG, 2 MI IN TRAIL AN SMA ON HDG 030 DEG, AND A THIRD SMA X ON HDG 360 DEG, ALL CLIMBING TO 3000'. NONE OF THE 3 SMA'S AUTOMATICALLY 'ACQUIRED'. MEANWHILE, I ADVISED MY FLT DATA MAN TO FORCE THE 3 SMA'S INTO THE ARTS AND FINALLY I HAD HIM MANUALLY 'DM' THE ACFT IN THE FDIO. WHILE HE WAS DOING THAT, I HAD MANUALLY COORDINATED WITH PSM APCH ON THE SMA'S. THE FIRST SMA I LEFT ON THE 060 DEG HDG FOR ENE AND CLIMBED HIM TO 9000. THE SECOND SMA, USING DIVERGENCE, WAS TURNED TO 090 DEG HDG, VECTORS TO INTERCEPT V106 AND CLIMBED TO 7000. THE THIRD SMA X WAS TURNED TO A 120 DEG HDG CLIMBING TO 5000' WHEN HE WAS 3 MILES NORTH OF THE RWY. LOCAL HAD RELEASED ATX Y ON A 060 DEG HDG CLIMBING TO 3000. I WAS COORDINATING HANDING OFF WITH PSM APCH ABOUT THE SMA'S AND MISSED ATX Y'S 'CHECK-ON'. SECONDS LATER ATX Y 'ACQUIRED' AT 3000'. I IMMEDIATELY ISSUED A TFC ALERT TO THE SMA X AND TURNED HIM 090 DEG TO MAINTAIN 3000. I THEN ISSUED AN IMMEDIATE CLIMB TO 5000 AND A 140 DEG HDG TO ATX Y. THERE WAS 100' AND 1 1/2 MI SEPARATION.

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.