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After receiving descent clearance, controller urgently told flight crew to climb and turn. Flight crew received TCASII which conflicted with controller's instructions. Controller was relieved by a supervisor. Flight crew contacted ATC after landing for review.
| Attributes | |
| ACN | 330681 |
| Time | |
| Date | 199603 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zdc |
| State Reference | DC |
| Altitude | msl bound lower : 28500 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 330681 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 330682 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were at FL290. Ride was getting choppy. Requested FL270. We were cleared to FL270. At approximately FL285, controller told us to maintain FL290 and turn right 090 degrees. Sensing urgency in his voice, I engaged altitude hold, selected 090 degrees and started climb back to FL290. This all took about 3 seconds. First officer was flying the aircraft and continued complying with ATC clearance. Approaching FL290, we got a TCASII TA, and I remember seeing +400 on the target. About this time TCASII changed to RA and commanded 'descend.' first officer started to push over, deck angle was approximately 15 degrees. I informed controller we had a TCASII RA commanding a descent. He very urgently repeated for us to climb. I grabbed the yoke and pulled to a light buffet. At this point the target merged without aircraft symbol -- our aircraft symbol -- I then saw target pass behind at -700. I asked controller to explain when he got a chance. He apparently was relieved and the next controller could give us no further information. I contacted mr X at ZDC. He is supervisor satcs and is conducting an investigation. No injuries occurred to the passenger or crew. Passenger believed that incident was a turbulence encounter.
Original NASA ASRS Text
Title: AFTER RECEIVING DSCNT CLRNC, CTLR URGENTLY TOLD FLC TO CLB AND TURN. FLC RECEIVED TCASII WHICH CONFLICTED WITH CTLR'S INSTRUCTIONS. CTLR WAS RELIEVED BY A SUPVR. FLC CONTACTED ATC AFTER LNDG FOR REVIEW.
Narrative: WE WERE AT FL290. RIDE WAS GETTING CHOPPY. REQUESTED FL270. WE WERE CLRED TO FL270. AT APPROX FL285, CTLR TOLD US TO MAINTAIN FL290 AND TURN R 090 DEGS. SENSING URGENCY IN HIS VOICE, I ENGAGED ALT HOLD, SELECTED 090 DEGS AND STARTED CLB BACK TO FL290. THIS ALL TOOK ABOUT 3 SECONDS. FO WAS FLYING THE ACFT AND CONTINUED COMPLYING WITH ATC CLRNC. APCHING FL290, WE GOT A TCASII TA, AND I REMEMBER SEEING +400 ON THE TARGET. ABOUT THIS TIME TCASII CHANGED TO RA AND COMMANDED 'DSND.' FO STARTED TO PUSH OVER, DECK ANGLE WAS APPROX 15 DEGS. I INFORMED CTLR WE HAD A TCASII RA COMMANDING A DSCNT. HE VERY URGENTLY REPEATED FOR US TO CLB. I GRABBED THE YOKE AND PULLED TO A LIGHT BUFFET. AT THIS POINT THE TARGET MERGED WITHOUT ACFT SYMBOL -- OUR ACFT SYMBOL -- I THEN SAW TARGET PASS BEHIND AT -700. I ASKED CTLR TO EXPLAIN WHEN HE GOT A CHANCE. HE APPARENTLY WAS RELIEVED AND THE NEXT CTLR COULD GIVE US NO FURTHER INFO. I CONTACTED MR X AT ZDC. HE IS SUPVR SATCS AND IS CONDUCTING AN INVESTIGATION. NO INJURIES OCCURRED TO THE PAX OR CREW. PAX BELIEVED THAT INCIDENT WAS A TURB ENCOUNTER.
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.