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Reporter relayed the wrong altitude to aircraft X. Aircraft X read back clearance with wrong altitude, reporter did not catch error until later.
| Attributes | |
| ACN | 427042 |
| Time | |
| Date | 199901 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zoa |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | other personnel |
| Qualification | other other : other |
| Experience | controller military : 5 controller non radar : 10 |
| ASRS Report | 427042 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence other other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | Operational Deviation |
Narrative:
At time XA11Z a clearance was issued by ZOA for aircraft X flight as follows: 'ATC clears aircraft X climb to and maintain FL330 report reaching.' the radio operator transmitted the clearance as: 'ATC clears aircraft X climb and maintain FL350 report reaching readback.' aircraft X read the clearance back as received from the radio operator. He reported level at FL350 at XA18Z. The radio operator detected the discrepancy in altitude from the issued clearance and informed ATC. At XA19Z the ATC controller issued a clearance for aircraft X to maintain FL350. Conclusions: the radio operator failed to follow established procedures by not transmitting an ATC clearance verbatim.
Original NASA ASRS Text
Title: RPTR RELAYED THE WRONG ALT TO ACFT X. ACFT X READ BACK CLRNC WITH WRONG ALT, RPTR DID NOT CATCH ERROR UNTIL LATER.
Narrative: AT TIME XA11Z A CLRNC WAS ISSUED BY ZOA FOR ACFT X FLT AS FOLLOWS: 'ATC CLRS ACFT X CLB TO AND MAINTAIN FL330 RPT REACHING.' THE RADIO OPERATOR XMITTED THE CLRNC AS: 'ATC CLRS ACFT X CLB AND MAINTAIN FL350 RPT REACHING READBACK.' ACFT X READ THE CLRNC BACK AS RECEIVED FROM THE RADIO OPERATOR. HE RPTED LEVEL AT FL350 AT XA18Z. THE RADIO OPERATOR DETECTED THE DISCREPANCY IN ALT FROM THE ISSUED CLRNC AND INFORMED ATC. AT XA19Z THE ATC CTLR ISSUED A CLRNC FOR ACFT X TO MAINTAIN FL350. CONCLUSIONS: THE RADIO OPERATOR FAILED TO FOLLOW ESTABLISHED PROCS BY NOT XMITTING AN ATC CLRNC VERBATIM.
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.