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A B737-300 flight crew slows below the assigned airspeed of 170 KTS on approach as they observe that they are gaining on a B757 which is 4-5 mi ahead on a visual approach to runway 16 at den, co.
| Attributes | |
| ACN | 534161 |
| Time | |
| Date | 200201 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : den.airport |
| State Reference | CO |
| Altitude | msl single value : 7000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 534161 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : wake turbulence non adherence : clearance non adherence : published procedure non adherence : required legal separation other anomaly |
| Independent Detector | atc equipment other atc equipment : radar other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory none taken : detected after the fact none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft |
| Primary Problem | ATC Human Performance |
Narrative:
Cleared for the visual runway 16, maintain 170 KTS until the FAF, caution wake turbulence following a B757. We turned final a few mi outside the FAF. It appeared we were catching the B757. We began to slow. This required getting the gear down, running checklists, and lowering flaps. During the process, ATC inquired about our speed. I told him we were slowing for wake. He told us that we were 5 mi in trail. He also said we had a requirement to fly 170 KTS and it was our responsibility to notify him before slowing. As directed, we changed over to tower. I inquired our distance to the B757. The tower stated 4 mi. We had a responsibility for wake turbulence separation. We were busy flying the aircraft. The communication didn't occur because of the workload.
Original NASA ASRS Text
Title: A B737-300 FLC SLOWS BELOW THE ASSIGNED AIRSPD OF 170 KTS ON APCH AS THEY OBSERVE THAT THEY ARE GAINING ON A B757 WHICH IS 4-5 MI AHEAD ON A VISUAL APCH TO RWY 16 AT DEN, CO.
Narrative: CLRED FOR THE VISUAL RWY 16, MAINTAIN 170 KTS UNTIL THE FAF, CAUTION WAKE TURB FOLLOWING A B757. WE TURNED FINAL A FEW MI OUTSIDE THE FAF. IT APPEARED WE WERE CATCHING THE B757. WE BEGAN TO SLOW. THIS REQUIRED GETTING THE GEAR DOWN, RUNNING CHKLISTS, AND LOWERING FLAPS. DURING THE PROCESS, ATC INQUIRED ABOUT OUR SPD. I TOLD HIM WE WERE SLOWING FOR WAKE. HE TOLD US THAT WE WERE 5 MI IN TRAIL. HE ALSO SAID WE HAD A REQUIREMENT TO FLY 170 KTS AND IT WAS OUR RESPONSIBILITY TO NOTIFY HIM BEFORE SLOWING. AS DIRECTED, WE CHANGED OVER TO TWR. I INQUIRED OUR DISTANCE TO THE B757. THE TWR STATED 4 MI. WE HAD A RESPONSIBILITY FOR WAKE TURB SEPARATION. WE WERE BUSY FLYING THE ACFT. THE COM DIDN'T OCCUR BECAUSE OF THE WORKLOAD.
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.