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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier twin jet is assigned a descent clearance which results in a potential conflict with unrpted traffic in the area of ZTL and ZME class a airspace 80 mi north of vuz, al.
| Attributes | |
| ACN | 489082 |
| Time | |
| Date | 200010 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| State Reference | AL |
| Altitude | msl bound lower : 24000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j39.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zme.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j39.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 13000 flight time type : 6000 |
| ASRS Report | 489082 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | conflict : airborne critical non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Problem Areas | Airspace Structure FAA ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure Operational Error |
| Situations | |
| ATC Facility | procedure or policy : ztl.artcc |
| Airspace Structure | class a : ztl.a |
Narrative:
Level FL370. ZTL gave us pilot discretion to FL240. We reported out of FL310 for FL240. Atl handed us off to ZME. We received a climb RA on TCASII. Before action could be taken, a 'monitor vertical speed' then 'clear of conflict' was issued. We reported it to ZME, who seemed confused why ZTL had given us a clearance to FL240. We were given a clearance to 11000 ft and then handed back to ZTL. I think there is a small segment of airspace (between atl and mem) where there are potential problems. Questions of separation and control could cause problem in traffic separation and handling.
Original NASA ASRS Text
Title: AN ACR TWIN JET IS ASSIGNED A DSCNT CLRNC WHICH RESULTS IN A POTENTIAL CONFLICT WITH UNRPTED TFC IN THE AREA OF ZTL AND ZME CLASS A AIRSPACE 80 MI N OF VUZ, AL.
Narrative: LEVEL FL370. ZTL GAVE US PLT DISCRETION TO FL240. WE RPTED OUT OF FL310 FOR FL240. ATL HANDED US OFF TO ZME. WE RECEIVED A CLB RA ON TCASII. BEFORE ACTION COULD BE TAKEN, A 'MONITOR VERT SPD' THEN 'CLR OF CONFLICT' WAS ISSUED. WE RPTED IT TO ZME, WHO SEEMED CONFUSED WHY ZTL HAD GIVEN US A CLRNC TO FL240. WE WERE GIVEN A CLRNC TO 11000 FT AND THEN HANDED BACK TO ZTL. I THINK THERE IS A SMALL SEGMENT OF AIRSPACE (BTWN ATL AND MEM) WHERE THERE ARE POTENTIAL PROBS. QUESTIONS OF SEPARATION AND CTL COULD CAUSE PROB IN TFC SEPARATION AND HANDLING.
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.