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Flight crew of a B737 were assigned and acknowledged a descent altitude during vectors to a final approach. Upon reaching the assigned altitude, ATC advised that it was not the altitude given. However, there was no conflict and approach clearance was given from that altitude with no further problems.
| Attributes | |
| ACN | 384812 |
| Time | |
| Date | 199711 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ind |
| State Reference | IN |
| Altitude | msl bound lower : 4000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : ind |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 500 flight time total : 15000 flight time type : 12000 |
| ASRS Report | 384812 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | other other : other pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 20000 flight time type : 5000 |
| ASRS Report | 384820 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Deviation other |
Narrative:
We were talking to ind approach control and we heard them clear us to 4000 ft and acknowledge them descending to 4000 ft. Approximately 30 seconds after leveling off at 4000 ft on a heading of 270 degrees, we were told to immediately turn left to a heading of 180 degrees by a different controller. We began the turn immediately and we asked, 'why the turn?' they said we should have been at 5000 ft. We told them we acknowledged a clearance to 4000 ft and ind approach responded that they had acknowledged us going to 4000 ft but we should have been at 5000 ft. Subsequent to this, approach told us that separation was assured. We had no TCASII alert during all of this. We believe that there was controller training in progress at ind approach.
Original NASA ASRS Text
Title: FLC OF A B737 WERE ASSIGNED AND ACKNOWLEDGED A DSCNT ALT DURING VECTORS TO A FINAL APCH. UPON REACHING THE ASSIGNED ALT, ATC ADVISED THAT IT WAS NOT THE ALT GIVEN. HOWEVER, THERE WAS NO CONFLICT AND APCH CLRNC WAS GIVEN FROM THAT ALT WITH NO FURTHER PROBS.
Narrative: WE WERE TALKING TO IND APCH CTL AND WE HEARD THEM CLR US TO 4000 FT AND ACKNOWLEDGE THEM DSNDING TO 4000 FT. APPROX 30 SECONDS AFTER LEVELING OFF AT 4000 FT ON A HDG OF 270 DEGS, WE WERE TOLD TO IMMEDIATELY TURN L TO A HDG OF 180 DEGS BY A DIFFERENT CTLR. WE BEGAN THE TURN IMMEDIATELY AND WE ASKED, 'WHY THE TURN?' THEY SAID WE SHOULD HAVE BEEN AT 5000 FT. WE TOLD THEM WE ACKNOWLEDGED A CLRNC TO 4000 FT AND IND APCH RESPONDED THAT THEY HAD ACKNOWLEDGED US GOING TO 4000 FT BUT WE SHOULD HAVE BEEN AT 5000 FT. SUBSEQUENT TO THIS, APCH TOLD US THAT SEPARATION WAS ASSURED. WE HAD NO TCASII ALERT DURING ALL OF THIS. WE BELIEVE THAT THERE WAS CTLR TRAINING IN PROGRESS AT IND APCH.
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.