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Flight crew of a B737 descended back to original assigned altitude in response to a TCASII RA caused by an MD80 level at a flight level through which they were climbing.
| Attributes | |
| ACN | 470693 |
| Time | |
| Date | 200004 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | MD |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc tracon : t75.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.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 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller military : 10 controller radar : 7 controller supervisory : 2 |
| ASRS Report | 470693 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller limited radar : 13 controller radar : 13 controller time certified in position1 : 0.3 |
| ASRS Report | 470495 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : radar other flight crewa |
| Resolutory Action | flight crew : took precautionary avoidance action none taken : anomaly accepted none taken : detected after the fact |
| Miss Distance | horizontal : 15000 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The sector was very busy at the time. Aircraft a was northbound, level FL290. Aircraft B was sbound, level FL280, but requesting FL310. The radar controller had vectored aircraft west of course for other traffic, therefore, she missed him in her scan and climbed aircraft B through his altitude. Aircraft a advised ATC he had responded to an RA and was now going back to FL290, but separation had already been lost. Busy traffic and new control equipment were contributing factors.
Original NASA ASRS Text
Title: FLC OF A B737 DSNDED BACK TO ORIGINAL ASSIGNED ALT IN RESPONSE TO A TCASII RA CAUSED BY AN MD80 LEVEL AT A FLT LEVEL THROUGH WHICH THEY WERE CLBING.
Narrative: THE SECTOR WAS VERY BUSY AT THE TIME. ACFT A WAS NBOUND, LEVEL FL290. ACFT B WAS SBOUND, LEVEL FL280, BUT REQUESTING FL310. THE RADAR CTLR HAD VECTORED ACFT W OF COURSE FOR OTHER TFC, THEREFORE, SHE MISSED HIM IN HER SCAN AND CLBED ACFT B THROUGH HIS ALT. ACFT A ADVISED ATC HE HAD RESPONDED TO AN RA AND WAS NOW GOING BACK TO FL290, BUT SEPARATION HAD ALREADY BEEN LOST. BUSY TFC AND NEW CTL EQUIP WERE CONTRIBUTING FACTORS.
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.