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A B757-200 encountered wake turbulence 5 miles in trail of sfo runway 28R localizer traffic at about 3400 ft.
| Attributes | |
| ACN | 769395 |
| Time | |
| Date | 200801 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | msl single value : 3400 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 28r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Navigation In Use | ils localizer & glide slope : 28r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 120 flight time total : 16500 flight time type : 3400 |
| ASRS Report | 769395 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 212 flight time total : 9800 flight time type : 3200 |
| ASRS Report | 769119 |
| Events | |
| Anomaly | inflight encounter : wake turbulence |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Environmental Factor |
| Primary Problem | ATC Human Performance |
Narrative:
Vectors to localizer runway 28R; cleared to intercept runway 28R localizer; at 4000 ft established on localizer. Then cleared to maintain 3000 ft and cleared for the approach. We armed the autopilots and started to descend to 3000 ft. At 3400 ft norcal called and asked our altitude. We said 3400 ft. He said to level off and intercept the GS at that altitude. We were about 5 miles in trail of the leading aircraft; and encountered a little wake turbulence off him. After established on full ILS approach and landing were normal.
Original NASA ASRS Text
Title: A B757-200 ENCOUNTERED WAKE TURBULENCE 5 MILES IN TRAIL OF SFO RWY 28R LOC TFC AT ABOUT 3400 FT.
Narrative: VECTORS TO LOC RWY 28R; CLRED TO INTERCEPT RWY 28R LOC; AT 4000 FT ESTABLISHED ON LOC. THEN CLRED TO MAINTAIN 3000 FT AND CLRED FOR THE APCH. WE ARMED THE AUTOPILOTS AND STARTED TO DSND TO 3000 FT. AT 3400 FT NORCAL CALLED AND ASKED OUR ALTITUDE. WE SAID 3400 FT. HE SAID TO LEVEL OFF AND INTERCEPT THE GS AT THAT ALTITUDE. WE WERE ABOUT 5 MILES IN TRAIL OF THE LEADING ACFT; AND ENCOUNTERED A LITTLE WAKE TURB OFF HIM. AFTER ESTABLISHED ON FULL ILS APCH AND LNDG WERE NORMAL.
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.