 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B767 flight crew at FL350 reports TCAS RA with climbing A340 near gapox on UG853. TCAS RA is complied with to achieve a 1000 foot vertical separation at cpa.
| Attributes | |
| ACN | 759784 |
| Time | |
| Date | 200710 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | intersection : gapox |
| State Reference | FO |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zzzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A340 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 445 flight time total : 11845 flight time type : 8000 |
| ASRS Report | 759784 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewb |
| Miss Distance | horizontal : 2000 vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While en route we received a TA at the 8 O'clock position. We established visual contact with aircraft (at night). This was followed by an RA approximately 10 seconds later with a descend command. PF complied by putting aircraft in a 1000 FPM descent to the green band on the vsi. After about 2 mins; and clear of other aircraft we returned to FL350. I had the other aircraft in sight during this maneuver. We had made an in-flight broadcast per africa theatre instructions 5 mins before the gapox fix. We heard no ifb from other aircraft on the 126.9 ifb frequency. The other aircraft; an air carrier Y; A340; contacted us on ifb frequency 126.9; about a min or so after the RA took place. He reported us in sight also as he was climbing to FL390. He received a climb RA which he followed. The air carrier Y aircraft was flying direct; not on airways and crossed our airway UG853 between published fixes and approached us from the 8 O'clock position crossing behind our flight path. We were/had been established on UG853 with a 2 mi right offset at time of conflict. The WX radar was in WX/TCAS mode as a precaution for unseen (at night) thunderstorms. This put our aircraft at the bottom of the WX radar display not showing the other aircraft which would be off bottom left side of WX radar display.
Original NASA ASRS Text
Title: B767 FLT CREW AT FL350 REPORTS TCAS RA WITH CLIMBING A340 NEAR GAPOX ON UG853. TCAS RA IS COMPLIED WITH TO ACHIEVE A 1000 FOOT VERTICAL SEPARATION AT CPA.
Narrative: WHILE ENRTE WE RECEIVED A TA AT THE 8 O'CLOCK POS. WE ESTABLISHED VISUAL CONTACT WITH ACFT (AT NIGHT). THIS WAS FOLLOWED BY AN RA APPROX 10 SECONDS LATER WITH A DSND COMMAND. PF COMPLIED BY PUTTING ACFT IN A 1000 FPM DSCNT TO THE GREEN BAND ON THE VSI. AFTER ABOUT 2 MINS; AND CLR OF OTHER ACFT WE RETURNED TO FL350. I HAD THE OTHER ACFT IN SIGHT DURING THIS MANEUVER. WE HAD MADE AN INFLT BROADCAST PER AFRICA THEATRE INSTRUCTIONS 5 MINS BEFORE THE GAPOX FIX. WE HEARD NO IFB FROM OTHER ACFT ON THE 126.9 IFB FREQ. THE OTHER ACFT; AN ACR Y; A340; CONTACTED US ON IFB FREQ 126.9; ABOUT A MIN OR SO AFTER THE RA TOOK PLACE. HE RPTED US IN SIGHT ALSO AS HE WAS CLBING TO FL390. HE RECEIVED A CLB RA WHICH HE FOLLOWED. THE ACR Y ACFT WAS FLYING DIRECT; NOT ON AIRWAYS AND CROSSED OUR AIRWAY UG853 BTWN PUBLISHED FIXES AND APCHED US FROM THE 8 O'CLOCK POS XING BEHIND OUR FLT PATH. WE WERE/HAD BEEN ESTABLISHED ON UG853 WITH A 2 MI R OFFSET AT TIME OF CONFLICT. THE WX RADAR WAS IN WX/TCAS MODE AS A PRECAUTION FOR UNSEEN (AT NIGHT) TSTMS. THIS PUT OUR ACFT AT THE BOTTOM OF THE WX RADAR DISPLAY NOT SHOWING THE OTHER ACFT WHICH WOULD BE OFF BOTTOM L SIDE OF WX RADAR DISPLAY.
Data retrieved from NASA's ASRS site as of January 2009 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.