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A B757 flight crew is assigned an altitude change 2 separate times that created a potential conflict with opposite direction traffic on frequency with ZOB.
| Attributes | |
| ACN | 588219 |
| Time | |
| Date | 200307 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : giber |
| State Reference | MI |
| Altitude | msl bound lower : 32000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer pilot : multi engine |
| Experience | flight time last 90 days : 150 flight time total : 12000 flight time type : 5000 |
| ASRS Report | 588219 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance controller : separated traffic flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 6000 vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor ATC Human Performance Airspace Structure |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were at FL330 cleared to FL270. Started descent. At FL320 we were told by ATC to climb to FL330 at which time we also received a TA for traffic at FL310. Promptly climbed to FL330. ATC then gave us 'descend to FL230 at no less than 2500 FPM.' we started the descent and then received an RA for FL310 traffic (2 different aircraft) to reduce our descent rate to approximately 1000 FPM followed by ATC giving climb back up to FL330 instructions which we did. ATC remarked that he realized the problem as 2 similar call signs on the frequency. We later called the ATC facility and the controller said he gave us the clrncs that he meant for the other aircraft with a similar call sign and that we responded correctly to his clrncs.
Original NASA ASRS Text
Title: A B757 FLT CREW IS ASSIGNED AN ALT CHANGE 2 SEPARATE TIMES THAT CREATED A POTENTIAL CONFLICT WITH OPPOSITE DIRECTION TFC ON FREQ WITH ZOB.
Narrative: WE WERE AT FL330 CLRED TO FL270. STARTED DSCNT. AT FL320 WE WERE TOLD BY ATC TO CLB TO FL330 AT WHICH TIME WE ALSO RECEIVED A TA FOR TFC AT FL310. PROMPTLY CLBED TO FL330. ATC THEN GAVE US 'DSND TO FL230 AT NO LESS THAN 2500 FPM.' WE STARTED THE DSCNT AND THEN RECEIVED AN RA FOR FL310 TFC (2 DIFFERENT ACFT) TO REDUCE OUR DSCNT RATE TO APPROX 1000 FPM FOLLOWED BY ATC GIVING CLB BACK UP TO FL330 INSTRUCTIONS WHICH WE DID. ATC REMARKED THAT HE REALIZED THE PROB AS 2 SIMILAR CALL SIGNS ON THE FREQ. WE LATER CALLED THE ATC FACILITY AND THE CTLR SAID HE GAVE US THE CLRNCS THAT HE MEANT FOR THE OTHER ACFT WITH A SIMILAR CALL SIGN AND THAT WE RESPONDED CORRECTLY TO HIS CLRNCS.
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.