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Nmm TRACON controller experienced loss of separation at approximately 6500 ft when military flight of T45's descended slower than expected and conflicted with departure aircraft.
| Attributes | |
| ACN | 701519 |
| Time | |
| Date | 200606 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : nmm.tracon |
| State Reference | MS |
| Altitude | msl bound lower : 6300 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : nmm.tracon |
| Operator | other |
| Make Model Name | Military |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : nmm.tracon |
| Operator | general aviation : personal |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 7 |
| ASRS Report | 701519 |
| Person 2 | |
| Affiliation | government : military |
| Function | oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 9000 vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
I accepted handoffs on a flight of 3 T45's inbound to mei and a C550 that had departed mei. The T45's were about 20 mi north of the airport and were given a 180 degree heading and a descent to 4000 ft. The C550 was about 5 mi north of the airport level at 7000 ft. The T45's were descending out of 8000 ft. The T45's did not descend at a normal rate and did not advise they were doing so. They leveled off at 6300 ft for approximately 2 1/2 mi. While in the process of passing the inbound strip to the next controller; I noticed they weren't going to make the descent. I then issued a corrective action turn to the northwest of the C550 and he advised his TCAS was 'going off.' I then notified my supervisor.
Original NASA ASRS Text
Title: NMM TRACON CTLR EXPERIENCED LOSS OF SEPARATION AT APPROX 6500 FT WHEN MIL FLT OF T45'S DSNDED SLOWER THAN EXPECTED AND CONFLICTED WITH DEP ACFT.
Narrative: I ACCEPTED HDOFS ON A FLT OF 3 T45'S INBOUND TO MEI AND A C550 THAT HAD DEPARTED MEI. THE T45'S WERE ABOUT 20 MI N OF THE ARPT AND WERE GIVEN A 180 DEG HDG AND A DSCNT TO 4000 FT. THE C550 WAS ABOUT 5 MI N OF THE ARPT LEVEL AT 7000 FT. THE T45'S WERE DSNDING OUT OF 8000 FT. THE T45'S DID NOT DSND AT A NORMAL RATE AND DID NOT ADVISE THEY WERE DOING SO. THEY LEVELED OFF AT 6300 FT FOR APPROX 2 1/2 MI. WHILE IN THE PROCESS OF PASSING THE INBOUND STRIP TO THE NEXT CTLR; I NOTICED THEY WEREN'T GOING TO MAKE THE DSCNT. I THEN ISSUED A CORRECTIVE ACTION TURN TO THE NW OF THE C550 AND HE ADVISED HIS TCAS WAS 'GOING OFF.' I THEN NOTIFIED MY SUPVR.
Data retrieved from NASA's ASRS site as of January 2009 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.