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B747 flight crew reports another B747 which they had been following through russian airspace for many hours; suddenly starts climbing into them after receiving a clearance. A TCAS RA is triggered and the reporters crew begins climbing in response. Khabarovsk control issues another clearance indicating that the triggering B747 had climbed in error.
| Attributes | |
| ACN | 1258215 |
| Time | |
| Date | 201504 |
| Place | |
| Locale Reference | UHHH.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B747 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 100 Flight Crew Total 23000 Flight Crew Type 1000 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 40 Flight Crew Total 5000 Flight Crew Type 1000 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude |
Narrative:
We were following a B-747. Over hek; we were directly above them by 2000 feet. I heard them accept a new clearance but did not hear what it was. We then saw them start a climb. We also expected them to stop at 37;100 feet but they continued to climb which set off our TCAS. I responded by clicking off the auto pilot and started a climbing right turn (there was also a slight course change over hek) our level off was 38;400 when we noticed the B747 started a descent to 36;000 feet; then 34;000 feet shortly thereafter. During the event; we told ATC we were in an RA-resolution advisory at which time ATC questioned the B747 crew on their altitude. I believe the aircraft came within 600-700 feet of us.
Original NASA ASRS Text
Title: B747 flight crew reports another B747 which they had been following through Russian airspace for many hours; suddenly starts climbing into them after receiving a clearance. A TCAS RA is triggered and the reporters crew begins climbing in response. Khabarovsk Control issues another clearance indicating that the triggering B747 had climbed in error.
Narrative: We were following a B-747. Over HEK; we were directly above them by 2000 feet. I heard them accept a new clearance but did not hear what it was. We then saw them start a climb. We also expected them to stop at 37;100 feet but they continued to climb which set off our TCAS. I responded by clicking off the auto pilot and started a climbing right turn (there was also a slight course change over HEK) Our level off was 38;400 when we noticed the B747 started a descent to 36;000 feet; then 34;000 feet shortly thereafter. During the event; we told ATC we were in an RA-resolution advisory at which time ATC questioned the B747 crew on their altitude. I believe the aircraft came within 600-700 feet of us.
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.