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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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B757 air carrier aircraft in holding pattern at FL370 receives a TCASII RA on same altitude traffic and climbs. Less than standard separation occurred as the other aircraft passed behind.
| Attributes | |
| ACN | 339676 |
| Time | |
| Date | 199606 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : rmg |
| State Reference | GA |
| Altitude | msl bound lower : 37000 msl bound upper : 38300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 15000 flight time type : 1200 |
| ASRS Report | 339676 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure 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 : 6000 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Our flight was holding on the rmg 287 degree/125 NM, l-turns. We were at the end of the 15 NM leg and began a turn crosswind to reintercept the inbound leg. Center called and gave a turn to 320 degrees. Midway through the turn they asked if we were in a right turn. We answered yes. At that same moment we received a 'traffic, traffic' call from TCASII. I observed a yellow target at 6.5 DME at our altitude. The target instantly went red RA with 'monitor vertical speed' call. I disconnected the autoplt and autothrottles and increased power to maximum climb and pulled to 1500 FPM (the green band). The target passed to the rear well inside the 2 NM ring at 400 ft lower. The center cleared us back into the holding pattern at FL290. Our top of climb was 38300. I feel the initial call was late. The center also did not ask our heading prior to assigning a new heading. They also did not mention a traffic conflict until asking if we were in a right turn. I'm sure the TCASII prevented a much more serious situation.
Original NASA ASRS Text
Title: B757 ACR ACFT IN HOLDING PATTERN AT FL370 RECEIVES A TCASII RA ON SAME ALT TFC AND CLBS. LTSS OCCURRED AS THE OTHER ACFT PASSED BEHIND.
Narrative: OUR FLT WAS HOLDING ON THE RMG 287 DEG/125 NM, L-TURNS. WE WERE AT THE END OF THE 15 NM LEG AND BEGAN A TURN XWIND TO REINTERCEPT THE INBOUND LEG. CTR CALLED AND GAVE A TURN TO 320 DEGS. MIDWAY THROUGH THE TURN THEY ASKED IF WE WERE IN A R TURN. WE ANSWERED YES. AT THAT SAME MOMENT WE RECEIVED A 'TFC, TFC' CALL FROM TCASII. I OBSERVED A YELLOW TARGET AT 6.5 DME AT OUR ALT. THE TARGET INSTANTLY WENT RED RA WITH 'MONITOR VERT SPD' CALL. I DISCONNECTED THE AUTOPLT AND AUTOTHROTTLES AND INCREASED PWR TO MAX CLB AND PULLED TO 1500 FPM (THE GREEN BAND). THE TARGET PASSED TO THE REAR WELL INSIDE THE 2 NM RING AT 400 FT LOWER. THE CTR CLRED US BACK INTO THE HOLDING PATTERN AT FL290. OUR TOP OF CLB WAS 38300. I FEEL THE INITIAL CALL WAS LATE. THE CTR ALSO DID NOT ASK OUR HDG PRIOR TO ASSIGNING A NEW HDG. THEY ALSO DID NOT MENTION A TFC CONFLICT UNTIL ASKING IF WE WERE IN A R TURN. I'M SURE THE TCASII PREVENTED A MUCH MORE SERIOUS SIT.
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.