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An MD80 crew is subjected to a potential conflict when the ZME controller misjudges traffic at their co-altitude 50 mi southeast of bna, tn.
| Attributes | |
| ACN | 455765 |
| Time | |
| Date | 199911 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | TN |
| Altitude | msl single value : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 280 flight time total : 11000 flight time type : 1800 |
| ASRS Report | 455765 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 280 flight time total : 3800 flight time type : 280 |
| ASRS Report | 456875 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance controller : separated traffic |
| Miss Distance | horizontal : 12000 vertical : 0 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Heading 145 degrees on radar vector at FL290 approximately 55 NM southeast of bna. Center issued clearance to immediately descend to FL240 and turn left to 090 degree heading. We then got a TA which showed the other aircraft 2 NM at our 4 O'clock position. Leveled out at FL260 and when clear, was cleared on course back up to FL330. Supplemental information from acn 456875: while at FL290 50 NM southeast of bna on a heading of 145 degrees assigned by center, we were told to descend immediately to FL240. We got a TA on the TCASII showing an aircraft at our 4 O'clock position at our altitude and 2 mi away.
Original NASA ASRS Text
Title: AN MD80 CREW IS SUBJECTED TO A POTENTIAL CONFLICT WHEN THE ZME CTLR MISJUDGES TFC AT THEIR CO-ALT 50 MI SE OF BNA, TN.
Narrative: HDG 145 DEGS ON RADAR VECTOR AT FL290 APPROX 55 NM SE OF BNA. CTR ISSUED CLRNC TO IMMEDIATELY DSND TO FL240 AND TURN L TO 090 DEG HDG. WE THEN GOT A TA WHICH SHOWED THE OTHER ACFT 2 NM AT OUR 4 O'CLOCK POS. LEVELED OUT AT FL260 AND WHEN CLR, WAS CLRED ON COURSE BACK UP TO FL330. SUPPLEMENTAL INFO FROM ACN 456875: WHILE AT FL290 50 NM SE OF BNA ON A HDG OF 145 DEGS ASSIGNED BY CTR, WE WERE TOLD TO DSND IMMEDIATELY TO FL240. WE GOT A TA ON THE TCASII SHOWING AN ACFT AT OUR 4 O'CLOCK POS AT OUR ALT AND 2 MI AWAY.
Data retrieved from NASA's ASRS site as of July 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.