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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Believing their clearance for a visual approach to oak was without restr other than to remain clear of reported traffic, B737 crew begins descent. The approach controller had expected them to maintain altitude.
| Attributes | |
| ACN | 523870 |
| Time | |
| Date | 200109 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : oak.airport |
| State Reference | CA |
| Altitude | msl bound lower : 5800 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sjc.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 4500 flight time type : 450 |
| ASRS Report | 523870 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Oak approach told us to maintain clear of the B777 and then he cleared us for the visual to runway 29. From 7000 ft we started descending and reaching 5800 ft oak approach said 'XXX #### what are you doing, go back to 6000 ft. You were supposed to be at 7000 ft.' so we went back up to 6000 ft and approach switched us off to another oak approach and they said not to worry about it.
Original NASA ASRS Text
Title: BELIEVING THEIR CLRNC FOR A VISUAL APCH TO OAK WAS WITHOUT RESTR OTHER THAN TO REMAIN CLR OF RPTED TFC, B737 CREW BEGINS DSCNT. THE APCH CTLR HAD EXPECTED THEM TO MAINTAIN ALT.
Narrative: OAK APCH TOLD US TO MAINTAIN CLR OF THE B777 AND THEN HE CLRED US FOR THE VISUAL TO RWY 29. FROM 7000 FT WE STARTED DSNDING AND REACHING 5800 FT OAK APCH SAID 'XXX #### WHAT ARE YOU DOING, GO BACK TO 6000 FT. YOU WERE SUPPOSED TO BE AT 7000 FT.' SO WE WENT BACK UP TO 6000 FT AND APCH SWITCHED US OFF TO ANOTHER OAK APCH AND THEY SAID NOT TO WORRY ABOUT IT.
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.