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An air carrier medium large transport suffers temporary loss of aircraft control after experiencing a wake turbulence encounter from a B747 less than 5 mi ahead on the ILS.
| Attributes | |
| ACN | 311918 |
| Time | |
| Date | 199507 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 2700 msl bound upper : 3300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos tower : bos tower : mli |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual enroute : on vectors enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7100 flight time type : 500 |
| ASRS Report | 311918 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | inflight encounter other non adherence : required legal separation non adherence : published procedure non adherence : far other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were on base leg at 4000 ft, speed 210 KTS assigned, heading 300 degrees assigned. We were advised that we were following a B747 and to call him in sight. We called him in sight and were given a 330 degree heading to intercept and told to follow him. No spacing information was given to us by ATC. After establishing on a 330 degree heading, we saw the B747 was less than 5 mi ahead on TCASII. We started slowing rapidly and ATC told us to hold 170 KTS till 5 DME. Our spacing continued to reduce despite continuing to slow. We were told to contact tower and after checking in we were told we had minimum spacing behind the B747. Immediately thereafter, we hit his wake, our aircraft rolled right and nosed down. The aircraft reached approximately 50 degrees right bank and 5-10 degrees nose down during recovery. Altitude was approximately 2700 ft MSL at recovery. A normal map was initiated and an uneventful VFR landing made.
Original NASA ASRS Text
Title: AN ACR MLG SUFFERS TEMPORARY LOSS OF ACFT CTL AFTER EXPERIENCING A WAKE TURB ENCOUNTER FROM A B747 LESS THAN 5 MI AHEAD ON THE ILS.
Narrative: WE WERE ON BASE LEG AT 4000 FT, SPD 210 KTS ASSIGNED, HDG 300 DEGS ASSIGNED. WE WERE ADVISED THAT WE WERE FOLLOWING A B747 AND TO CALL HIM IN SIGHT. WE CALLED HIM IN SIGHT AND WERE GIVEN A 330 DEG HDG TO INTERCEPT AND TOLD TO FOLLOW HIM. NO SPACING INFO WAS GIVEN TO US BY ATC. AFTER ESTABLISHING ON A 330 DEG HDG, WE SAW THE B747 WAS LESS THAN 5 MI AHEAD ON TCASII. WE STARTED SLOWING RAPIDLY AND ATC TOLD US TO HOLD 170 KTS TILL 5 DME. OUR SPACING CONTINUED TO REDUCE DESPITE CONTINUING TO SLOW. WE WERE TOLD TO CONTACT TWR AND AFTER CHKING IN WE WERE TOLD WE HAD MINIMUM SPACING BEHIND THE B747. IMMEDIATELY THEREAFTER, WE HIT HIS WAKE, OUR ACFT ROLLED R AND NOSED DOWN. THE ACFT REACHED APPROX 50 DEGS R BANK AND 5-10 DEGS NOSE DOWN DURING RECOVERY. ALT WAS APPROX 2700 FT MSL AT RECOVERY. A NORMAL MAP WAS INITIATED AND AN UNEVENTFUL VFR LNDG MADE.
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.