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Flight crew of an medium large transport aircraft stopped their descent in response to a TCASII RA just prior to ATC requesting them to climb back to previous assigned altitude.
| Attributes | |
| ACN | 266685 |
| Time | |
| Date | 199403 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cce |
| State Reference | FL |
| Altitude | msl bound lower : 32800 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 140 flight time total : 7500 flight time type : 140 |
| ASRS Report | 266685 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 20000 |
| ASRS Report | 266683 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 4000 vertical : 1800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Captain flying, I'm first officer, running radios. ZJX gave clearance to descend pilot's discretion to FL240 from our cruise altitude of FL330. I acknowledged and captain repeated. Jax changed us over to ZMA where I checked on 'FL330 with clearance to FL240 pilot's discretion.' controller rogered and she was very busy. Soon we started descent and made call 'leaving 330.' TCASII alerted 'traffic' at 31500 ft, looked and saw traffic 11 O'clock. TCASII alerted 'reduce descent.' captain followed direction then TCASII alerted 'climb, climb.' captain followed TCASII RA and smoothly climbed. The other airplane was in sight throughout and passed below and ahead 2 mi, 1500 ft vertical. Controller told us to 'climb and maintain FL330' about the time the TCASII RA came up. I responded after captain had completed the RA maneuver so I could back him up. I told controller I had reported on with pilot's discretion to FL240. She repeated instruction to FL330. Captain climbed to FL330. Captain then called center himself and asked when descent could be made. Different controller came on to clear us down. Sounded like ZJX and ZMA had communication breakdown in handoff and someone missed the pilot's discretion clearance.
Original NASA ASRS Text
Title: FLC OF AN MLG ACFT STOPPED THEIR DSCNT IN RESPONSE TO A TCASII RA JUST PRIOR TO ATC REQUESTING THEM TO CLB BACK TO PREVIOUS ASSIGNED ALT.
Narrative: CAPT FLYING, I'M FO, RUNNING RADIOS. ZJX GAVE CLRNC TO DSND PLT'S DISCRETION TO FL240 FROM OUR CRUISE ALT OF FL330. I ACKNOWLEDGED AND CAPT REPEATED. JAX CHANGED US OVER TO ZMA WHERE I CHKED ON 'FL330 WITH CLRNC TO FL240 PLT'S DISCRETION.' CTLR ROGERED AND SHE WAS VERY BUSY. SOON WE STARTED DSCNT AND MADE CALL 'LEAVING 330.' TCASII ALERTED 'TFC' AT 31500 FT, LOOKED AND SAW TFC 11 O'CLOCK. TCASII ALERTED 'REDUCE DSCNT.' CAPT FOLLOWED DIRECTION THEN TCASII ALERTED 'CLB, CLB.' CAPT FOLLOWED TCASII RA AND SMOOTHLY CLBED. THE OTHER AIRPLANE WAS IN SIGHT THROUGHOUT AND PASSED BELOW AND AHEAD 2 MI, 1500 FT VERT. CTLR TOLD US TO 'CLB AND MAINTAIN FL330' ABOUT THE TIME THE TCASII RA CAME UP. I RESPONDED AFTER CAPT HAD COMPLETED THE RA MANEUVER SO I COULD BACK HIM UP. I TOLD CTLR I HAD RPTED ON WITH PLT'S DISCRETION TO FL240. SHE REPEATED INSTRUCTION TO FL330. CAPT CLBED TO FL330. CAPT THEN CALLED CTR HIMSELF AND ASKED WHEN DSCNT COULD BE MADE. DIFFERENT CTLR CAME ON TO CLR US DOWN. SOUNDED LIKE ZJX AND ZMA HAD COM BREAKDOWN IN HDOF AND SOMEONE MISSED THE PLT'S DISCRETION CLRNC.
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.