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A radio operator from sfo commercial radio reports relaying an altitude climb clearance to an air carrier flight crew in the north pacific then failing to catch an erroneous readback.
| Attributes | |
| ACN | 480406 |
| Time | |
| Date | 200007 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : zan.artcc |
| State Reference | AK |
| Altitude | msl bound lower : 29000 msl bound upper : 35000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zan.artcc tower : rst.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute : other oceanic |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zan.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | other personnel other oversight : coordinator |
| Qualification | other other : radio operator |
| ASRS Report | 480406 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | other controllera other other : 1 |
| Resolutory Action | controller : issued new clearance controller : separated traffic none taken : detected after the fact |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance Company |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft X requested FL350 or FL330. Zan issued a clearance for aircraft X to climb to and maintain FL310. The radio operator delivered the clearance correctly. Aircraft X read back an incorrect altitude of FL350. The operator did not catch the incorrect readback. Aircraft X climbed through FL330, which was occupied by aircraft Y, and ended up at FL350, which was occupied by aircraft Z. When aircraft X reported level at FL350, the radio operator caught the error and advised zan. The controller then issued a clearance to aircraft Z to climb to FL370.
Original NASA ASRS Text
Title: A RADIO OPERATOR FROM SFO COMMERCIAL RADIO RPTS RELAYING AN ALT CLB CLRNC TO AN ACR FLC IN THE NORTH PACIFIC THEN FAILING TO CATCH AN ERRONEOUS READBACK.
Narrative: ACFT X REQUESTED FL350 OR FL330. ZAN ISSUED A CLRNC FOR ACFT X TO CLB TO AND MAINTAIN FL310. THE RADIO OPERATOR DELIVERED THE CLRNC CORRECTLY. ACFT X READ BACK AN INCORRECT ALT OF FL350. THE OPERATOR DID NOT CATCH THE INCORRECT READBACK. ACFT X CLBED THROUGH FL330, WHICH WAS OCCUPIED BY ACFT Y, AND ENDED UP AT FL350, WHICH WAS OCCUPIED BY ACFT Z. WHEN ACFT X RPTED LEVEL AT FL350, THE RADIO OPERATOR CAUGHT THE ERROR AND ADVISED ZAN. THE CTLR THEN ISSUED A CLRNC TO ACFT Z TO CLB TO FL370.
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.