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B757 departure from mdw encountered strong winds and autothrottle problems and turned outside published limitations.
| Attributes | |
| ACN | 615407 |
| Time | |
| Date | 200404 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mdw.airport |
| State Reference | IL |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 6350 flight time type : 650 |
| ASRS Report | 615407 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe inflight encounter : weather non adherence : clearance non adherence : published procedure other anomaly other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Weather Aircraft Flight Crew Human Performance |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were making a repositioning flight from mdw to ord without passenger. The winds were gusting over 40 KTS. We were very light on takeoff and the winds caused a lot of turbulence on our 12 min flight. On takeoff from runway 22L, they assigned us a right turn to 110 degrees (I think), the long way around. With the gusty winds, the autothrottles were not keeping up with the speed selected. The autothrottles kept commanding more thrust, even though we were accelerating through our desired speed. I disconnected the autothrottles and reduced thrust, but we were already going 280 KTS because of the winds, and being so light. So at 3000 ft, we were to receive vectors to ord. Because of the strong winds and autothrottle malfunction, we were unable to comply with the 'complete turns within 4 DME of mdw' restr. Mdw departure mentioned that we had gone outside the 4 DME circle. Even without the autothrottle malfunction, I'm not sure we would have been able to comply. The winds were blowing too hard and the 250 degree turn took a long time.
Original NASA ASRS Text
Title: B757 DEP FROM MDW ENCOUNTERED STRONG WINDS AND AUTOTHROTTLE PROBS AND TURNED OUTSIDE PUBLISHED LIMITATIONS.
Narrative: WE WERE MAKING A REPOSITIONING FLT FROM MDW TO ORD WITHOUT PAX. THE WINDS WERE GUSTING OVER 40 KTS. WE WERE VERY LIGHT ON TKOF AND THE WINDS CAUSED A LOT OF TURB ON OUR 12 MIN FLT. ON TKOF FROM RWY 22L, THEY ASSIGNED US A R TURN TO 110 DEGS (I THINK), THE LONG WAY AROUND. WITH THE GUSTY WINDS, THE AUTOTHROTTLES WERE NOT KEEPING UP WITH THE SPD SELECTED. THE AUTOTHROTTLES KEPT COMMANDING MORE THRUST, EVEN THOUGH WE WERE ACCELERATING THROUGH OUR DESIRED SPD. I DISCONNECTED THE AUTOTHROTTLES AND REDUCED THRUST, BUT WE WERE ALREADY GOING 280 KTS BECAUSE OF THE WINDS, AND BEING SO LIGHT. SO AT 3000 FT, WE WERE TO RECEIVE VECTORS TO ORD. BECAUSE OF THE STRONG WINDS AND AUTOTHROTTLE MALFUNCTION, WE WERE UNABLE TO COMPLY WITH THE 'COMPLETE TURNS WITHIN 4 DME OF MDW' RESTR. MDW DEP MENTIONED THAT WE HAD GONE OUTSIDE THE 4 DME CIRCLE. EVEN WITHOUT THE AUTOTHROTTLE MALFUNCTION, I'M NOT SURE WE WOULD HAVE BEEN ABLE TO COMPLY. THE WINDS WERE BLOWING TOO HARD AND THE 250 DEG TURN TOOK A LONG TIME.
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.