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B767 flight crew at FL320 experienced a TCAS RA with an aircraft above them that was unable to maintain altitude due to turbulence. A descent was initiated to FL315 to receive a 'clear of conflict' from the TCAS.
| Attributes | |
| ACN | 1299732 |
| Time | |
| Date | 201510 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | LFMM.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 138 Flight Crew Type 138 |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 116 Flight Crew Total 667 Flight Crew Type 72 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Weather / Turbulence |
Narrative:
We were in level flight at 320 on with marseille center frequency 127.54. We were in moderate turbulence and the airspace was relatively congested. We got a TCAS descent RA from the aircraft above us. The captain who was the flying pilot disconnected the auto pilot and immediately followed the TCAS command. We descended from FL320 to 31;500 feet. As soon as we were clear of the conflict we climbed back to FL320. I reported to ATC that we had responded to a TCAS decent RA and that we had deviated from our altitude. The aircraft that descended into our altitude said he had hit severe turbulence and could not control his altitude. We never got a traffic advisory from TCAS only the resolution advisory. Our TCAS showed zero altitude separation from the aircraft.
Original NASA ASRS Text
Title: B767 flight crew at FL320 experienced a TCAS RA with an aircraft above them that was unable to maintain altitude due to turbulence. A descent was initiated to FL315 to receive a 'clear of conflict' from the TCAS.
Narrative: We were in level flight at 320 on with Marseille Center frequency 127.54. We were in moderate turbulence and the airspace was relatively congested. We got a TCAS descent RA from the aircraft above us. The Captain who was the flying pilot disconnected the auto pilot and immediately followed the TCAS command. We descended from FL320 to 31;500 feet. As soon as we were clear of the conflict we climbed back to FL320. I reported to ATC that we had responded to a TCAS decent RA and that we had deviated from our altitude. The aircraft that descended into our altitude said he had hit severe turbulence and could not control his altitude. We never got a traffic advisory from TCAS only the resolution advisory. Our TCAS showed zero altitude separation from the aircraft.
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.