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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier medium large transport descended below the altitude that the TRACON approach controller cleared the aircraft to fly. The flight crew believes that they received and read back 10000 ft while the controller claims that he gave them 11000 ft.
| Attributes | |
| ACN | 360428 |
| Time | |
| Date | 199702 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival star : star enroute : on vectors enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 9000 flight time type : 600 |
| ASRS Report | 360428 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 11500 flight time type : 7700 |
| ASRS Report | 360270 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
Our flight was given holding at lagrange VOR. Before we crossed the holding fix, ATC instructed us to make our turn outbound, then gave us a vector. Then we received a clearance to proceed direct tiroe and to cross 10 mi west of tiroe at 10000 ft and 250 KTS. That is the clearance I thought I heard and I read back. We were close to the fix, so it was a 'hurry up' descent. Out of 11000 ft or below, ATC asked 'where are you going?' I replied, '10000 ft.' ATC said, 'I didn't catch that, maintain 11000 ft.' we climbed to 11000 ft. I thought I understood the clearance to cross the fix at 10000 ft.
Original NASA ASRS Text
Title: AN ACR MLG DSNDED BELOW THE ALT THAT THE TRACON APCH CTLR CLRED THE ACFT TO FLY. THE FLC BELIEVES THAT THEY RECEIVED AND READ BACK 10000 FT WHILE THE CTLR CLAIMS THAT HE GAVE THEM 11000 FT.
Narrative: OUR FLT WAS GIVEN HOLDING AT LAGRANGE VOR. BEFORE WE CROSSED THE HOLDING FIX, ATC INSTRUCTED US TO MAKE OUR TURN OUTBOUND, THEN GAVE US A VECTOR. THEN WE RECEIVED A CLRNC TO PROCEED DIRECT TIROE AND TO CROSS 10 MI W OF TIROE AT 10000 FT AND 250 KTS. THAT IS THE CLRNC I THOUGHT I HEARD AND I READ BACK. WE WERE CLOSE TO THE FIX, SO IT WAS A 'HURRY UP' DSCNT. OUT OF 11000 FT OR BELOW, ATC ASKED 'WHERE ARE YOU GOING?' I REPLIED, '10000 FT.' ATC SAID, 'I DIDN'T CATCH THAT, MAINTAIN 11000 FT.' WE CLBED TO 11000 FT. I THOUGHT I UNDERSTOOD THE CLRNC TO CROSS THE FIX AT 10000 FT.
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.