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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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During climb out from sfo, flight crew leveled at assigned altitude and observed traffic visually and on TCASII with a TA. The ARTCC radar controller advised the flight should have been at a lower altitude. The crew insisted they had acknowledged the altitude they had been assigned.
| Attributes | |
| ACN | 405142 |
| Time | |
| Date | 199806 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sfo |
| State Reference | CA |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 2700 flight time type : 175 |
| ASRS Report | 405142 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 9500 flight time type : 1100 |
| ASRS Report | 405477 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance none taken : unable other |
| Consequence | Other |
| Miss Distance | horizontal : 2000 vertical : 1200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was the copilot (first officer) on airline flight air carrier X from sfo to sea. On climb out, ZOA 'cleared us to FL280 will have higher later after crossing traffic ahead.' level at FL280 oakland said 'air carrier X cleared to FL290 for higher later, crossing traffic at FL310.' as PNF I responded, 'roger air carrier X climbing to FL290.' leveling off at FL290 we had visual contact on the crossing aircraft at our 1-2 O'clock position, and a few mi. Our TCASII showed the aircraft at FL300 with a TA. With the aircraft still in sight we received an RA with a verbal descend command. The captain then clicked off the autoplt to begin a descent when TCASII reported to 'monitor vertical speed.' we maintained FL290 and the other aircraft appeared to turn away. At this time oakland said 'air carrier X I think your clearance was to FL280.' I responded and said 'we were originally cleared to FL280 then you (ATC) cleared us up to FL290 with higher after crossing traffic and I read back cleared to FL290.'
Original NASA ASRS Text
Title: DURING CLBOUT FROM SFO, FLC LEVELED AT ASSIGNED ALT AND OBSERVED TFC VISUALLY AND ON TCASII WITH A TA. THE ARTCC RADAR CTLR ADVISED THE FLT SHOULD HAVE BEEN AT A LOWER ALT. THE CREW INSISTED THEY HAD ACKNOWLEDGED THE ALT THEY HAD BEEN ASSIGNED.
Narrative: I WAS THE COPLT (FO) ON AIRLINE FLT ACR X FROM SFO TO SEA. ON CLBOUT, ZOA 'CLRED US TO FL280 WILL HAVE HIGHER LATER AFTER XING TFC AHEAD.' LEVEL AT FL280 OAKLAND SAID 'ACR X CLRED TO FL290 FOR HIGHER LATER, XING TFC AT FL310.' AS PNF I RESPONDED, 'ROGER ACR X CLBING TO FL290.' LEVELING OFF AT FL290 WE HAD VISUAL CONTACT ON THE XING ACFT AT OUR 1-2 O'CLOCK POS, AND A FEW MI. OUR TCASII SHOWED THE ACFT AT FL300 WITH A TA. WITH THE ACFT STILL IN SIGHT WE RECEIVED AN RA WITH A VERBAL DSND COMMAND. THE CAPT THEN CLICKED OFF THE AUTOPLT TO BEGIN A DSCNT WHEN TCASII RPTED TO 'MONITOR VERT SPD.' WE MAINTAINED FL290 AND THE OTHER ACFT APPEARED TO TURN AWAY. AT THIS TIME OAKLAND SAID 'ACR X I THINK YOUR CLRNC WAS TO FL280.' I RESPONDED AND SAID 'WE WERE ORIGINALLY CLRED TO FL280 THEN YOU (ATC) CLRED US UP TO FL290 WITH HIGHER AFTER XING TFC AND I READ BACK CLRED TO FL290.'
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.