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An approaching B737 flight crew misinterps their clearance, descend to 10000 ft, and receive a GPWS warning as controller alerts them to altitude deviation during a night operation 25 NM from tus, az.
| Attributes | |
| ACN | 622222 |
| Time | |
| Date | 200303 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : tus.airport |
| State Reference | AZ |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : tus.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 214 flight time total : 19000 flight time type : 1700 |
| ASRS Report | 622222 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment : gpws other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Environmental Factor |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At 14000 ft and about 45-50 mi from tus, I was on radio #2 trying to reach operations for a gate assignment. During this time, first officer took a call from tus approach to descend to what he thought was 10000 ft and did so. After I completed my call to operations, first officer briefed me on the descent clearance to 10000 ft. At about 25 mi from tus, approach told us we needed to be at 11000 ft and told us to climb. At about this same time we got one 'terrain, terrain' GPWS warning as we started our climb to 11000 ft. About 1 min after reaching 11000 ft, the controller told us to descend to 6000 ft. The remainder of the approach was normal.
Original NASA ASRS Text
Title: AN APCHING B737 FLT CREW MISINTERPS THEIR CLRNC, DSND TO 10000 FT, AND RECEIVE A GPWS WARNING AS CTLR ALERTS THEM TO ALTDEV DURING A NIGHT OP 25 NM FROM TUS, AZ.
Narrative: AT 14000 FT AND ABOUT 45-50 MI FROM TUS, I WAS ON RADIO #2 TRYING TO REACH OPS FOR A GATE ASSIGNMENT. DURING THIS TIME, FO TOOK A CALL FROM TUS APCH TO DSND TO WHAT HE THOUGHT WAS 10000 FT AND DID SO. AFTER I COMPLETED MY CALL TO OPS, FO BRIEFED ME ON THE DSCNT CLRNC TO 10000 FT. AT ABOUT 25 MI FROM TUS, APCH TOLD US WE NEEDED TO BE AT 11000 FT AND TOLD US TO CLB. AT ABOUT THIS SAME TIME WE GOT ONE 'TERRAIN, TERRAIN' GPWS WARNING AS WE STARTED OUR CLB TO 11000 FT. ABOUT 1 MIN AFTER REACHING 11000 FT, THE CTLR TOLD US TO DSND TO 6000 FT. THE REMAINDER OF THE APCH WAS NORMAL.
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.