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ZTL controller described incident when atl arrival slowed without advising ATC; causing a potential conflict with succeeding traffic.
| Attributes | |
| ACN | 742064 |
| Time | |
| Date | 200706 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : lgc.vortac |
| State Reference | GA |
| Altitude | msl single value : 24000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B717 (Formerly MD-95) |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 14 controller time certified in position1 : 14 flight time total : 100 |
| ASRS Report | 742064 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance FAA Company |
| Primary Problem | Flight Crew Human Performance |
Narrative:
B717 inbound to atl reduced his speed to 270 KTS without telling the controller or asking for a speed reduction. This has happened several times over the past 6 months. Several air carrier's have been involved. The FAA has allowed the air carrier's to do this; reduce their airspeed without telling a controller. The logic of the FAA is that will help the air carrier's save fuel. This is not safe. Yesterday I had 10 aircraft behind B717. The jet behind B717 came within 6 mi before I noticed what B717 had done. We had WX in the sector with many aircraft deviating. This policy is 'betting on the come' that an air traffic controller will catch the change. ZTL is the busiest facility in the world and we are entering thunderstorm season. The chance that a controller will miss something is great.
Original NASA ASRS Text
Title: ZTL CTLR DESCRIBED INCIDENT WHEN ATL ARR SLOWED WITHOUT ADVISING ATC; CAUSING A POTENTIAL CONFLICT WITH SUCCEEDING TFC.
Narrative: B717 INBOUND TO ATL REDUCED HIS SPD TO 270 KTS WITHOUT TELLING THE CTLR OR ASKING FOR A SPD REDUCTION. THIS HAS HAPPENED SEVERAL TIMES OVER THE PAST 6 MONTHS. SEVERAL ACR'S HAVE BEEN INVOLVED. THE FAA HAS ALLOWED THE ACR'S TO DO THIS; REDUCE THEIR AIRSPD WITHOUT TELLING A CTLR. THE LOGIC OF THE FAA IS THAT WILL HELP THE ACR'S SAVE FUEL. THIS IS NOT SAFE. YESTERDAY I HAD 10 ACFT BEHIND B717. THE JET BEHIND B717 CAME WITHIN 6 MI BEFORE I NOTICED WHAT B717 HAD DONE. WE HAD WX IN THE SECTOR WITH MANY ACFT DEVIATING. THIS POLICY IS 'BETTING ON THE COME' THAT AN AIR TFC CTLR WILL CATCH THE CHANGE. ZTL IS THE BUSIEST FACILITY IN THE WORLD AND WE ARE ENTERING TSTM SEASON. THE CHANCE THAT A CTLR WILL MISS SOMETHING IS GREAT.
Data retrieved from NASA's ASRS site as of January 2009 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.