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A B757 departure bda is given climb clearance while near a descending, maneuvering westwind. ATC had given the westwind permission to deviate but had not taken the climb of the B757 into consideration.
| Attributes | |
| ACN | 416110 |
| Time | |
| Date | 199810 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bda |
| State Reference | FO |
| Altitude | msl bound lower : 3700 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other enroute : atlantic enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | IAI1123 Westwind |
| Operating Under FAR Part | other : unknown |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 416110 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 416111 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : weather non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
ZNY, bda 336 degree radial, 10 DME. Level 4000 ft, departing bda. Cleared direct targa. Cleared to climb by ZNY. We had a TCASII target just in front of us and 1000 ft above. Asked ZNY if he was sure he wanted us to climb due to our observed traffic. He responded, 'maintain 4000 ft,' and told other traffic to turn left immediately. Traffic continued to descend, which gave us an RA and directed a descent. We followed TCASII RA directive for a 1500 FPM descent, for 300 ft. Then it advised 'monitor vertical speed.' when clear of traffic, we returned to 4000 ft. We advised ATC of our deviation when we did it and of our return to 4000 ft when complete. Supplemental information from acn 416111: at approximately 1500 ft on takeoff, received amended altitude clearance to maintain 4000 ft. ATC then directed conflicting traffic, a westwind, to make an immediate left turn. On return to bos, called center and was advised that the westwind had been cleared to deviate but had made an unexpected 100 degree turn.
Original NASA ASRS Text
Title: A B757 DEP BDA IS GIVEN CLB CLRNC WHILE NEAR A DSNDING, MANEUVERING WESTWIND. ATC HAD GIVEN THE WESTWIND PERMISSION TO DEVIATE BUT HAD NOT TAKEN THE CLB OF THE B757 INTO CONSIDERATION.
Narrative: ZNY, BDA 336 DEG RADIAL, 10 DME. LEVEL 4000 FT, DEPARTING BDA. CLRED DIRECT TARGA. CLRED TO CLB BY ZNY. WE HAD A TCASII TARGET JUST IN FRONT OF US AND 1000 FT ABOVE. ASKED ZNY IF HE WAS SURE HE WANTED US TO CLB DUE TO OUR OBSERVED TFC. HE RESPONDED, 'MAINTAIN 4000 FT,' AND TOLD OTHER TFC TO TURN L IMMEDIATELY. TFC CONTINUED TO DSND, WHICH GAVE US AN RA AND DIRECTED A DSCNT. WE FOLLOWED TCASII RA DIRECTIVE FOR A 1500 FPM DSCNT, FOR 300 FT. THEN IT ADVISED 'MONITOR VERT SPD.' WHEN CLR OF TFC, WE RETURNED TO 4000 FT. WE ADVISED ATC OF OUR DEV WHEN WE DID IT AND OF OUR RETURN TO 4000 FT WHEN COMPLETE. SUPPLEMENTAL INFO FROM ACN 416111: AT APPROX 1500 FT ON TKOF, RECEIVED AMENDED ALT CLRNC TO MAINTAIN 4000 FT. ATC THEN DIRECTED CONFLICTING TFC, A WESTWIND, TO MAKE AN IMMEDIATE L TURN. ON RETURN TO BOS, CALLED CTR AND WAS ADVISED THAT THE WESTWIND HAD BEEN CLRED TO DEVIATE BUT HAD MADE AN UNEXPECTED 100 DEG TURN.
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.