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B737-300 flight crew slowed aircraft to assure adequate distance between them and a B757 directed by ATC to follow on the approach. However, they had been instructed to maintain a higher speed than that which they were now slowed causing ATC to alert them to that fact.
| Attributes | |
| ACN | 534483 |
| 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 : 9000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : d01.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| 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 : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 33 |
| ASRS Report | 534483 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | inflight encounter : wake turbulence non adherence : clearance other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 24000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On approach into den, we were 'cleared for the visual runway 16, maintain 170 KTS to the marker, you are following a B757.' as we turned final, about 2 mi outside the marker, it appeared we were closing on the B757, so we started slowing the aircraft gear, landing checklist etc. Hence we were busy when ATC questioned our speed. The captain told them we were slowing for wake when ATC informed us that we had to maintain 170 KTS and that the distance was 5 mi. As asked, we contacted tower and the captain asked tower our distance from the B757, to which the tower replied 4 mi. Knowing that when cleared for the visual we have accepted responses for wake, etc, we were busy flying the aircraft. This hindered us momentarily to communication with ATC.
Original NASA ASRS Text
Title: B737-300 FLC SLOWED ACFT TO ASSURE ADEQUATE DISTANCE BTWN THEM AND A B757 DIRECTED BY ATC TO FOLLOW ON THE APCH. HOWEVER, THEY HAD BEEN INSTRUCTED TO MAINTAIN A HIGHER SPD THAN THAT WHICH THEY WERE NOW SLOWED CAUSING ATC TO ALERT THEM TO THAT FACT.
Narrative: ON APCH INTO DEN, WE WERE 'CLRED FOR THE VISUAL RWY 16, MAINTAIN 170 KTS TO THE MARKER, YOU ARE FOLLOWING A B757.' AS WE TURNED FINAL, ABOUT 2 MI OUTSIDE THE MARKER, IT APPEARED WE WERE CLOSING ON THE B757, SO WE STARTED SLOWING THE ACFT GEAR, LNDG CHKLIST ETC. HENCE WE WERE BUSY WHEN ATC QUESTIONED OUR SPD. THE CAPT TOLD THEM WE WERE SLOWING FOR WAKE WHEN ATC INFORMED US THAT WE HAD TO MAINTAIN 170 KTS AND THAT THE DISTANCE WAS 5 MI. AS ASKED, WE CONTACTED TWR AND THE CAPT ASKED TWR OUR DISTANCE FROM THE B757, TO WHICH THE TWR REPLIED 4 MI. KNOWING THAT WHEN CLRED FOR THE VISUAL WE HAVE ACCEPTED RESPONSES FOR WAKE, ETC, WE WERE BUSY FLYING THE ACFT. THIS HINDERED US MOMENTARILY TO COM WITH ATC.
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.