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A B757 encountered wake turbulence behind a heavy aircraft on approach to ord runway 10 and slowed the approach speed after ATC gave an assigned speed.
| Attributes | |
| ACN | 809123 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl single value : 3000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument non precision |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 14000 flight time type : 1600 |
| ASRS Report | 809123 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 240 flight time total : 5000 flight time type : 3000 |
| ASRS Report | 809126 |
| Events | |
| Anomaly | inflight encounter : wake turbulence non adherence : clearance other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | Airspace Structure ATC Human Performance Flight Crew Human Performance Environmental Factor |
| Primary Problem | ATC Human Performance |
Narrative:
Turning base to final on a vector thru the localizer; we encountered wake turbulence behind a heavy. ATC advised us to maintain 160 KIAS to bugse. 2 miles prior to bugse; we noticed on TCAS that we were within 5 miles separation from the heavy. We started to slow the aircraft to approach speed without notifying the controller. Crossing bugse; we contacted the tower; tower asked for our speed which we told them was 140 KTS slowing to target speed 138 KTS. We ran the final descent checklist to an uneventful landing. Looking back on this event; I should have advised the controllers that we were slowing down prior to bugse.
Original NASA ASRS Text
Title: A B757 ENCOUNTERED WAKE TURBULENCE BEHIND A HEAVY ACFT ON APCH TO ORD RWY 10 AND SLOWED THE APCH SPD AFTER ATC GAVE AN ASSIGNED SPD.
Narrative: TURNING BASE TO FINAL ON A VECTOR THRU THE LOCALIZER; WE ENCOUNTERED WAKE TURB BEHIND A HEAVY. ATC ADVISED US TO MAINTAIN 160 KIAS TO BUGSE. 2 MILES PRIOR TO BUGSE; WE NOTICED ON TCAS THAT WE WERE WITHIN 5 MILES SEPARATION FROM THE HEAVY. WE STARTED TO SLOW THE ACFT TO APCH SPEED WITHOUT NOTIFYING THE CTLR. CROSSING BUGSE; WE CONTACTED THE TOWER; TOWER ASKED FOR OUR SPEED WHICH WE TOLD THEM WAS 140 KTS SLOWING TO TARGET SPEED 138 KTS. WE RAN THE FINAL DSCNT CHECKLIST TO AN UNEVENTFUL LNDG. LOOKING BACK ON THIS EVENT; I SHOULD HAVE ADVISED THE CTLRS THAT WE WERE SLOWING DOWN PRIOR TO BUGSE.
Data retrieved from NASA's ASRS site as of May 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.