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Air carrier flight crew reported a deviation for weather in oceanic airspace; after deviating a message was received from ATC that denied the deviation.
| Attributes | |
| ACN | 1476596 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | KZAK.ARTCC |
| State Reference | CA |
| Environment | |
| Flight Conditions | Marginal |
| Aircraft 1 | |
| Make Model Name | Widebody Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
About 3+26 into flight at FL330; after passing n46e170; we encountered moderate to severe turbulence with associated 'pop-up' radar returns beneath the aircraft. We couldn't see as we were at the cloud tops. As pilot monitoring; I sent sf radio [arinc] a message requesting left deviation for weather; we had radar indications that prevented a right deviation. Sf radio's response wasn't timely enough and we decided to deviate left off of our strategic lateral offset procedure. We reviewed the long range navigation (lrn) for weather deviations and were aware of parameters and altitude requirements of a deviation off course for weather. Our left deviation kept the aircraft at a safe distance away magenta indications on the radar. Sf radio replied with 'unable deviation left due to traffic.' by this time we had already deviated left. Upon receiving this message the flying pilot turned right to return on course; while avoiding weather. Sf radio sent another message indicating they showed us off course. We replied that we were back on course.intent is to communicate why we deviated for weather and that the crew was aware of off track deviation procedures.
Original NASA ASRS Text
Title: Air Carrier flight crew reported a deviation for weather in oceanic airspace; after deviating a message was received from ATC that denied the deviation.
Narrative: About 3+26 into flight at FL330; after passing N46E170; we encountered moderate to severe turbulence with associated 'pop-up' radar returns beneath the aircraft. We couldn't see as we were at the cloud tops. As Pilot Monitoring; I sent SF Radio [ARINC] a message requesting left deviation for weather; we had radar indications that prevented a right deviation. SF Radio's response wasn't timely enough and we decided to deviate left off of our Strategic Lateral Offset Procedure. We reviewed the Long Range Navigation (LRN) for weather deviations and were aware of parameters and altitude requirements of a deviation off course for weather. Our left deviation kept the aircraft at a safe distance away magenta indications on the radar. SF Radio replied with 'unable deviation left due to traffic.' By this time we had already deviated left. Upon receiving this message the flying pilot turned right to return on course; while avoiding weather. SF Radio sent another message indicating they showed us off course. We replied that we were back on course.Intent is to communicate why we deviated for weather and that the crew was aware of off track deviation procedures.
Data retrieved from NASA's ASRS site 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.