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B757-200 flight crew followed the ATC clearance for another aircraft. Clarification of the clearance was obtained before a traffic conflict occurred.
| Attributes | |
| ACN | 784610 |
| Time | |
| Date | 200805 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : jfk.airport |
| State Reference | NY |
| Altitude | msl single value : 6500 |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time total : 25000 flight time type : 6000 |
| ASRS Report | 784610 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 784609 |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
1) new assigned heading and frequency change plus a request to expedite descent; from new york approach. 2) readback was not confirmed of above; as PNF only heard 'expedite descent.' 3) after a call to approach to confirm if there was a clearance; new clearance was issued to level off and stop turn. 4) PF queried with PNF 'check cleared heading' to ensure both crew had heard correct clearance. 5) time delay until recall caused a possible conflict with a B747; and approach gave new clearance which was followed -- no conflict was observed; but a conflict was certainly possible. Causal factors: 1) PNF had just returned to use of radio after PA announcement to have flight attendants prepare for landing statement. 2) PF was not sure if PNF had heard clearance and was hand flying and expediting descent. 3) the noise level in the B757 cockpit; with both packs and recirculation fans on; makes ATC communications difficult in the lower levels due to excessive cockpit noise.
Original NASA ASRS Text
Title: B757-200 FLT CREW FOLLOWED THE ATC CLRNC FOR ANOTHER ACFT. CLARIFICATION OF THE CLRNC WAS OBTAINED BEFORE A TFC CONFLICT OCCURRED.
Narrative: 1) NEW ASSIGNED HDG AND FREQ CHANGE PLUS A REQUEST TO EXPEDITE DSCNT; FROM NEW YORK APCH. 2) READBACK WAS NOT CONFIRMED OF ABOVE; AS PNF ONLY HEARD 'EXPEDITE DSCNT.' 3) AFTER A CALL TO APCH TO CONFIRM IF THERE WAS A CLRNC; NEW CLRNC WAS ISSUED TO LEVEL OFF AND STOP TURN. 4) PF QUERIED WITH PNF 'CHK CLRED HDG' TO ENSURE BOTH CREW HAD HEARD CORRECT CLRNC. 5) TIME DELAY UNTIL RECALL CAUSED A POSSIBLE CONFLICT WITH A B747; AND APCH GAVE NEW CLRNC WHICH WAS FOLLOWED -- NO CONFLICT WAS OBSERVED; BUT A CONFLICT WAS CERTAINLY POSSIBLE. CAUSAL FACTORS: 1) PNF HAD JUST RETURNED TO USE OF RADIO AFTER PA ANNOUNCEMENT TO HAVE FLT ATTENDANTS PREPARE FOR LNDG STATEMENT. 2) PF WAS NOT SURE IF PNF HAD HEARD CLRNC AND WAS HAND FLYING AND EXPEDITING DSCNT. 3) THE NOISE LEVEL IN THE B757 COCKPIT; WITH BOTH PACKS AND RECIRCULATION FANS ON; MAKES ATC COMS DIFFICULT IN THE LOWER LEVELS DUE TO EXCESSIVE COCKPIT NOISE.
Data retrieved from NASA's ASRS site as of May 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.