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B757 flight crew described excursion from assigned altitude during similar call sign event; no loss of separation occurred.
| Attributes | |
| ACN | 727349 |
| Time | |
| Date | 200702 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : vhp.vortac |
| State Reference | IN |
| Altitude | msl single value : 37000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 125 flight time total : 9000 flight time type : 2700 |
| ASRS Report | 727349 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 14000 flight time type : 450 |
| ASRS Report | 727647 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
At cruise at FL370; the captain had just hung up with the purser when I heard ATC say '--?-- descend to FL350 with at least 2000 FPM.' the captain keyed the microphone and said; 'verify that was for air carrier X expedite down to FL350?' she replied; 'affirmative.' I used vertical speed to begin the descent. Passing FL367; the controller said; 'air carrier Y continue the expedited descent to FL330.' he responded as the captain and I looked at each other and I began to stop the descent. Before he could key the microphone; the controller said; 'air carrier X verify level FL370.' we responded that we had taken the clearance and were now climbing back to FL370. She responded 'roger; be advised; air carrier Y also on frequency.'
Original NASA ASRS Text
Title: B757 FLT CREW DESCRIBED EXCURSION FROM ASSIGNED ALT DURING SIMILAR CALL SIGN EVENT; NO LOSS OF SEPARATION OCCURRED.
Narrative: AT CRUISE AT FL370; THE CAPT HAD JUST HUNG UP WITH THE PURSER WHEN I HEARD ATC SAY '--?-- DSND TO FL350 WITH AT LEAST 2000 FPM.' THE CAPT KEYED THE MIKE AND SAID; 'VERIFY THAT WAS FOR ACR X EXPEDITE DOWN TO FL350?' SHE REPLIED; 'AFFIRMATIVE.' I USED VERT SPD TO BEGIN THE DSCNT. PASSING FL367; THE CTLR SAID; 'ACR Y CONTINUE THE EXPEDITED DSCNT TO FL330.' HE RESPONDED AS THE CAPT AND I LOOKED AT EACH OTHER AND I BEGAN TO STOP THE DSCNT. BEFORE HE COULD KEY THE MIKE; THE CTLR SAID; 'ACR X VERIFY LEVEL FL370.' WE RESPONDED THAT WE HAD TAKEN THE CLRNC AND WERE NOW CLBING BACK TO FL370. SHE RESPONDED 'ROGER; BE ADVISED; ACR Y ALSO ON FREQ.'
Data retrieved from NASA's ASRS site as of January 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.