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Altitude deviation excursion from assigned altitude occurs as B737-300 flight crew has a problem with clearance interpretation readback hearback disputed.
| Attributes | |
| ACN | 343360 |
| Time | |
| Date | 199608 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : czq |
| State Reference | CA |
| Altitude | msl bound lower : 22000 msl bound upper : 23000 |
| 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 | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 16800 flight time type : 6800 |
| ASRS Report | 343360 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 10200 flight time type : 4800 |
| ASRS Report | 343342 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
En route from fat to rno, IRS direct ZOA (121.25) cleared us to climb to FL230. I read back the clearance saying 'flight xyz, cleared to FL230.' I set in the altitude FL230 in the autoplt control panel and the first officer agreed and said 'FL230.' after we reached FL230 ZOA (121.25) said 'what is your altitude?' we said FL230. ZOA said 'you were only cleared to FL220, descend immediately.' we responded saying we had been cleared to FL230. We did comply with the new clearance and descended to FL220. No targets were observed on the TCASII which was in the 40 mi range. The conditions were daylight VFR. Supplemental information from acn 343342: I hear we are cleared to FL230. The captain set FL230 in the altitude window of the MCP and repeats aloud 'FL230.' I acknowledge verbally.
Original NASA ASRS Text
Title: ALTDEV EXCURSION FROM ASSIGNED ALT OCCURS AS B737-300 FLC HAS A PROB WITH CLRNC INTERP READBACK HEARBACK DISPUTED.
Narrative: ENRTE FROM FAT TO RNO, IRS DIRECT ZOA (121.25) CLRED US TO CLB TO FL230. I READ BACK THE CLRNC SAYING 'FLT XYZ, CLRED TO FL230.' I SET IN THE ALT FL230 IN THE AUTOPLT CTL PANEL AND THE FO AGREED AND SAID 'FL230.' AFTER WE REACHED FL230 ZOA (121.25) SAID 'WHAT IS YOUR ALT?' WE SAID FL230. ZOA SAID 'YOU WERE ONLY CLRED TO FL220, DSND IMMEDIATELY.' WE RESPONDED SAYING WE HAD BEEN CLRED TO FL230. WE DID COMPLY WITH THE NEW CLRNC AND DSNDED TO FL220. NO TARGETS WERE OBSERVED ON THE TCASII WHICH WAS IN THE 40 MI RANGE. THE CONDITIONS WERE DAYLIGHT VFR. SUPPLEMENTAL INFO FROM ACN 343342: I HEAR WE ARE CLRED TO FL230. THE CAPT SET FL230 IN THE ALT WINDOW OF THE MCP AND REPEATS ALOUD 'FL230.' I ACKNOWLEDGE VERBALLY.
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.