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Widebody transport encounters wake turbulence of another widebody transport and has stick-shaker activate.
| Attributes | |
| ACN | 169736 |
| Time | |
| Date | 199102 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 5000 msl bound upper : 5300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8000 flight time type : 1000 |
| ASRS Report | 169736 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : overshoot inflight encounter other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : exited adverse environment |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared for takeoff 23L (ord), maintain runway heading to 5000'. Was following a widebody transport. When approaching 5000' we encountered the widebody transport's wake, causing the stick-shaker to come on (we were at approximately 230 KTS, above clean maneuvering speed). Upon recovery, our altitude was approximately 5300' and we descended back down to 5000'. An aircraft was observed crossing left to right in front of us, approximately 2000' above and 2 1/2 ahead of us. No evasive action taken. Even though we had the proper spacing, we still had encountered the widebody transport's wake, which caused our altitude deviation.
Original NASA ASRS Text
Title: WDB ENCOUNTERS WAKE TURB OF ANOTHER WDB AND HAS STICK-SHAKER ACTIVATE.
Narrative: CLRED FOR TKOF 23L (ORD), MAINTAIN RWY HDG TO 5000'. WAS FOLLOWING A WDB. WHEN APCHING 5000' WE ENCOUNTERED THE WDB'S WAKE, CAUSING THE STICK-SHAKER TO COME ON (WE WERE AT APPROX 230 KTS, ABOVE CLEAN MANEUVERING SPD). UPON RECOVERY, OUR ALT WAS APPROX 5300' AND WE DSNDED BACK DOWN TO 5000'. AN ACFT WAS OBSERVED XING LEFT TO RIGHT IN FRONT OF US, APPROX 2000' ABOVE AND 2 1/2 AHEAD OF US. NO EVASIVE ACTION TAKEN. EVEN THOUGH WE HAD THE PROPER SPACING, WE STILL HAD ENCOUNTERED THE WDB'S WAKE, WHICH CAUSED OUR ALT DEVIATION.
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.