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Air carrier FK10 flight crew deviates from clearance, descending across other protected airspace of an adjoining control zone.
| Attributes | |
| ACN | 425379 |
| Time | |
| Date | 199901 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dal |
| State Reference | TX |
| Altitude | msl bound lower : 2700 msl bound upper : 3000 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Navigation In Use | Other |
| Flight Phase | descent other other |
| Route In Use | approach : visual arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 425379 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| ASRS Report | 425380 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude |
| Independent Detector | other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On left downwind for runway 13L at dal, approach cleared us to remain above 3000 ft till on final. We began our turn to base and approach pointed out traffic to runway 13R. We were high and tight, so we began our descent out of 3000 ft on base. At 2700 ft, approach asked if we had copied his clearance to remain at 3000 ft till on final. I responded yes, but thought the restr was for noise abatement and we started down with engines at idle. Approach informed the restr is for possible traffic off of addison field. He stated there was no conflict. I talked to approach on the phone after landing and he said there was no conflict. I think the note on approach chart page should be changed to read assignment to remain at 3000 ft till final by approach control is due to possible traffic conflict with addison field. Supplemental information from acn 425380: this was third leg into dal that day, and the 2 previous legs we were cleared for visual approachs to runway 13L but were cleared to descend out of 3000 ft on the base leg. That was what I thought the clearance was 'maintain 3000 ft until base leg' and thus started my descent on base leg instead of until final. Regardless of past procedures for the day's flying, each approach has its own specific clearance.
Original NASA ASRS Text
Title: ACR FK10 FLC DEVIATES FROM CLRNC, DSNDING ACROSS OTHER PROTECTED AIRSPACE OF AN ADJOINING CTL ZONE.
Narrative: ON L DOWNWIND FOR RWY 13L AT DAL, APCH CLRED US TO REMAIN ABOVE 3000 FT TILL ON FINAL. WE BEGAN OUR TURN TO BASE AND APCH POINTED OUT TFC TO RWY 13R. WE WERE HIGH AND TIGHT, SO WE BEGAN OUR DSCNT OUT OF 3000 FT ON BASE. AT 2700 FT, APCH ASKED IF WE HAD COPIED HIS CLRNC TO REMAIN AT 3000 FT TILL ON FINAL. I RESPONDED YES, BUT THOUGHT THE RESTR WAS FOR NOISE ABATEMENT AND WE STARTED DOWN WITH ENGS AT IDLE. APCH INFORMED THE RESTR IS FOR POSSIBLE TFC OFF OF ADDISON FIELD. HE STATED THERE WAS NO CONFLICT. I TALKED TO APCH ON THE PHONE AFTER LNDG AND HE SAID THERE WAS NO CONFLICT. I THINK THE NOTE ON APCH CHART PAGE SHOULD BE CHANGED TO READ ASSIGNMENT TO REMAIN AT 3000 FT TILL FINAL BY APCH CTL IS DUE TO POSSIBLE TFC CONFLICT WITH ADDISON FIELD. SUPPLEMENTAL INFO FROM ACN 425380: THIS WAS THIRD LEG INTO DAL THAT DAY, AND THE 2 PREVIOUS LEGS WE WERE CLRED FOR VISUAL APCHS TO RWY 13L BUT WERE CLRED TO DSND OUT OF 3000 FT ON THE BASE LEG. THAT WAS WHAT I THOUGHT THE CLRNC WAS 'MAINTAIN 3000 FT UNTIL BASE LEG' AND THUS STARTED MY DSCNT ON BASE LEG INSTEAD OF UNTIL FINAL. REGARDLESS OF PAST PROCS FOR THE DAY'S FLYING, EACH APCH HAS ITS OWN SPECIFIC CLRNC.
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.