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Widebody transport aircraft descending into foreign airport had TCASII target and flight crew acquired it visually. The other aircraft continued on a collision course and climbing into reporter aircraft. Evasive action taken as other aircraft turned away also.
| Attributes | |
| ACN | 398667 |
| Time | |
| Date | 199804 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : nrt |
| State Reference | FO |
| Altitude | msl bound lower : 9000 msl bound upper : 9200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : nrt |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | other : other |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 19000 flight time type : 2000 |
| ASRS Report | 398667 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 10000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
On descent into narita from 12000 ft to 6000 ft, saw a target on TCASII at 1-2 O'clock position, 600 ft below and about 5 mi away. Visually saw aircraft and started a slight turn away. We were on an assigned heading of 310 degrees. This aircraft was climbing, heading right for us. About 5 seconds later got a TA, then maybe 5 seconds later got an RA to climb, then monitor vertical speed. We stopped descending and began to climb. The other aircraft, a B747, turned to his left and I saw we were clear. I don't know if he saw us and turned or what. The first approach controller said to us, after the RA, to maintain 9000 ft and pointed out the other aircraft. It would have been too late. We topped out at 9200 ft or so. It was a smooth maneuver because we saw the aircraft the entire time and had started to turn away before the TA. Our estimate was that we had 300 ft vertical separation and 1-2 mi horizontally. The TCASII worked fine without it, and if we had been IFR, we might have met.
Original NASA ASRS Text
Title: WDB ACFT DSNDING INTO FOREIGN ARPT HAD TCASII TARGET AND FLC ACQUIRED IT VISUALLY. THE OTHER ACFT CONTINUED ON A COLLISION COURSE AND CLBING INTO RPTR ACFT. EVASIVE ACTION TAKEN AS OTHER ACFT TURNED AWAY ALSO.
Narrative: ON DSCNT INTO NARITA FROM 12000 FT TO 6000 FT, SAW A TARGET ON TCASII AT 1-2 O'CLOCK POS, 600 FT BELOW AND ABOUT 5 MI AWAY. VISUALLY SAW ACFT AND STARTED A SLIGHT TURN AWAY. WE WERE ON AN ASSIGNED HEADING OF 310 DEGS. THIS ACFT WAS CLBING, HEADING RIGHT FOR US. ABOUT 5 SECONDS LATER GOT A TA, THEN MAYBE 5 SECONDS LATER GOT AN RA TO CLB, THEN MONITOR VERT SPD. WE STOPPED DSNDING AND BEGAN TO CLB. THE OTHER ACFT, A B747, TURNED TO HIS L AND I SAW WE WERE CLR. I DON'T KNOW IF HE SAW US AND TURNED OR WHAT. THE FIRST APCH CTLR SAID TO US, AFTER THE RA, TO MAINTAIN 9000 FT AND POINTED OUT THE OTHER ACFT. IT WOULD HAVE BEEN TOO LATE. WE TOPPED OUT AT 9200 FT OR SO. IT WAS A SMOOTH MANEUVER BECAUSE WE SAW THE ACFT THE ENTIRE TIME AND HAD STARTED TO TURN AWAY BEFORE THE TA. OUR ESTIMATE WAS THAT WE HAD 300 FT VERT SEPARATION AND 1-2 MI HORIZLY. THE TCASII WORKED FINE WITHOUT IT, AND IF WE HAD BEEN IFR, WE MIGHT HAVE MET.
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.