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An altitude assignment readback in error is not caught by the ARTCC radar controller until the aircraft is below the expected level off altitude.
| Attributes | |
| ACN | 508330 |
| Time | |
| Date | 200104 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zoa.artcc |
| State Reference | CA |
| Altitude | msl bound lower : 31000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 2500 |
| ASRS Report | 508330 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure non adherence : clearance |
| Resolutory Action | controller : issued advisory controller : issued new clearance |
| Consequence | other |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
En route to smf I was flying. The captain was working radios. We were cruising at FL370. ZOA called and said to descend to what we thought was FL230. Captain read back FL230. As we were passing through FL330, ZOA said 'air carrier X say altitude.' captain said 'FL310 for FL230.' ZOA said 'I gave you FL330.' captain said 'I read back FL230.' ZOA said 'descend to FL240.' captain read back 'FL240.' captain asked ZOA if we needed to call. Center said 'that will not be necessary.'
Original NASA ASRS Text
Title: AN ALT ASSIGNMENT READBACK IN ERROR IS NOT CAUGHT BY THE ARTCC RADAR CTLR UNTIL THE ACFT IS BELOW THE EXPECTED LEVEL OFF ALT.
Narrative: ENRTE TO SMF I WAS FLYING. THE CAPT WAS WORKING RADIOS. WE WERE CRUISING AT FL370. ZOA CALLED AND SAID TO DSND TO WHAT WE THOUGHT WAS FL230. CAPT READ BACK FL230. AS WE WERE PASSING THROUGH FL330, ZOA SAID 'ACR X SAY ALT.' CAPT SAID 'FL310 FOR FL230.' ZOA SAID 'I GAVE YOU FL330.' CAPT SAID 'I READ BACK FL230.' ZOA SAID 'DSND TO FL240.' CAPT READ BACK 'FL240.' CAPT ASKED ZOA IF WE NEEDED TO CALL. CTR SAID 'THAT WILL NOT BE NECESSARY.'
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.