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A B757-200 starts a descent on a clearance to FL310 from FL390 that was meant for another aircraft on another frequency. First officer says that he had received an affirmation of his readback from the controller.
| Attributes | |
| ACN | 423351 |
| Time | |
| Date | 199812 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : mod |
| State Reference | CA |
| Altitude | msl bound lower : 38200 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 210 flight time total : 15000 flight time type : 3200 |
| ASRS Report | 423351 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 9000 flight time type : 400 |
| ASRS Report | 423107 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | vertical : 1200 |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation Operational Deviation |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Operating flight cvg-sfo on the modesto 2 arrival into sfo. ZOA said, 'cleared out FL390 for FL310.' we acknowledged 'air carrier xy leaving FL390 for FL310.' at about FL384 ZOA asked 'are you out of FL390?' we replied that we were passing FL384 for FL310. ZOA said to climb back to FL390 that the clearance was for another aircraft on another frequency. As we started to climb he gave us a 50 degree turn to 200 degrees. I disconnected the autoplt to climb and turn more quickly. We received 2 traffic alerts as we climbed and turned. We did not see the other traffic. Lowest altitude was FL382. ZOA was very busy at the time with many xmissions being stepped upon. Controllers working 2 frequencys always causes confusion. Supplemental information from acn 423107: I transmitted, 'out of FL390 for FL310 now.' I received an affirmative reply to my transmission.
Original NASA ASRS Text
Title: A B757-200 STARTS A DSCNT ON A CLRNC TO FL310 FROM FL390 THAT WAS MEANT FOR ANOTHER ACFT ON ANOTHER FREQ. FO SAYS THAT HE HAD RECEIVED AN AFFIRMATION OF HIS READBACK FROM THE CTLR.
Narrative: OPERATING FLT CVG-SFO ON THE MODESTO 2 ARR INTO SFO. ZOA SAID, 'CLRED OUT FL390 FOR FL310.' WE ACKNOWLEDGED 'ACR XY LEAVING FL390 FOR FL310.' AT ABOUT FL384 ZOA ASKED 'ARE YOU OUT OF FL390?' WE REPLIED THAT WE WERE PASSING FL384 FOR FL310. ZOA SAID TO CLB BACK TO FL390 THAT THE CLRNC WAS FOR ANOTHER ACFT ON ANOTHER FREQ. AS WE STARTED TO CLB HE GAVE US A 50 DEG TURN TO 200 DEGS. I DISCONNECTED THE AUTOPLT TO CLB AND TURN MORE QUICKLY. WE RECEIVED 2 TFC ALERTS AS WE CLBED AND TURNED. WE DID NOT SEE THE OTHER TFC. LOWEST ALT WAS FL382. ZOA WAS VERY BUSY AT THE TIME WITH MANY XMISSIONS BEING STEPPED UPON. CTLRS WORKING 2 FREQS ALWAYS CAUSES CONFUSION. SUPPLEMENTAL INFO FROM ACN 423107: I XMITTED, 'OUT OF FL390 FOR FL310 NOW.' I RECEIVED AN AFFIRMATIVE REPLY TO MY XMISSION.
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.