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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier widebody transport at 7000 ft being vectored on base leg for runway 27L was instructed to increase their rate of turn. The air carrier flight crew disengaged the autoplt to increase their turn and almost immediately received a TCASII RA command to descend. They descended to 6100 ft when the controller issued a climb back to 7000 ft.
| Attributes | |
| ACN | 377686 |
| Time | |
| Date | 199708 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 6100 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 8000 flight time type : 225 |
| ASRS Report | 377686 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 1000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
After holding at macey on the macey arrival, we were vectored for downwind for runway 26R atl. We were then told to expect runway 27L, and vectored to a modified base leg. As we turned, controller tells me to increase rate of turn. I disengaged autoplt to increase turn and almost instantaneously, we get TCASII warning (traffic). Traffic warning goes to RA very fast. TCASII instructs us to descend. I follow TCASII command to approximately 6100 ft. The controller then tells us to climb. TCASII gives clear of conflict. We climb to 7000 ft and are vectored to downwind for runway 26R landing.
Original NASA ASRS Text
Title: AN ACR WDB AT 7000 FT BEING VECTORED ON BASE LEG FOR RWY 27L WAS INSTRUCTED TO INCREASE THEIR RATE OF TURN. THE ACR FLC DISENGAGED THE AUTOPLT TO INCREASE THEIR TURN AND ALMOST IMMEDIATELY RECEIVED A TCASII RA COMMAND TO DSND. THEY DSNDED TO 6100 FT WHEN THE CTLR ISSUED A CLB BACK TO 7000 FT.
Narrative: AFTER HOLDING AT MACEY ON THE MACEY ARR, WE WERE VECTORED FOR DOWNWIND FOR RWY 26R ATL. WE WERE THEN TOLD TO EXPECT RWY 27L, AND VECTORED TO A MODIFIED BASE LEG. AS WE TURNED, CTLR TELLS ME TO INCREASE RATE OF TURN. I DISENGAGED AUTOPLT TO INCREASE TURN AND ALMOST INSTANTANEOUSLY, WE GET TCASII WARNING (TFC). TFC WARNING GOES TO RA VERY FAST. TCASII INSTRUCTS US TO DSND. I FOLLOW TCASII COMMAND TO APPROX 6100 FT. THE CTLR THEN TELLS US TO CLB. TCASII GIVES CLR OF CONFLICT. WE CLB TO 7000 FT AND ARE VECTORED TO DOWNWIND FOR RWY 26R LNDG.
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.