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B737 flight crew reports taxiing without their final weights then receiving a runway change while doing single engine taxi. Very congested ground control frequency along with several hold instructions during taxi result in the before takeoff checklist not being completed. The result is a takeoff with the flaps set to 1 instead of 5 as required by the runway change.
| Attributes | |
| ACN | 1300904 |
| Time | |
| Date | 201510 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flap Control (Trailing & Leading Edge) |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 147 Flight Crew Type 4262 |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 209 Flight Crew Type 900 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy |
Narrative:
Pushed back without weights. Multiple changes in taxi instructions. Single engine taxi. Radio congestion. Taxiway congestion. Runway change. Checklist interruption multiple times by ATC. Extremely busy operations.during taxi we missed the change in flap setting while completing checklist. We believe ATC called at the point of calling for flap configuration on 'before takeoff' checklist and it was missed. We set flaps correctly initially but failed to catch the change from 1 to 5 degrees. FMC was set up correctly but we missed changing flap position. Ramp said the right runway then changed by ATC to the left. On takeoff we noticed flaps were set wrong just before V1 and chose to continue by adding 10 knots to vr and V2. Takeoff felt normal.
Original NASA ASRS Text
Title: B737 flight crew reports taxiing without their final weights then receiving a runway change while doing single engine taxi. Very congested Ground Control frequency along with several hold instructions during taxi result in the before takeoff checklist not being completed. The result is a takeoff with the flaps set to 1 instead of 5 as required by the runway change.
Narrative: Pushed back without weights. Multiple changes in taxi instructions. Single engine taxi. Radio congestion. Taxiway congestion. Runway change. Checklist interruption multiple times by ATC. Extremely busy operations.During taxi we missed the change in flap setting while completing checklist. We believe ATC called at the point of calling for flap configuration on 'before takeoff' checklist and it was missed. We set flaps correctly initially but failed to catch the change from 1 to 5 degrees. FMC was set up correctly but we missed changing flap position. Ramp said the right runway then changed by ATC to the left. On takeoff we noticed flaps were set wrong just before V1 and chose to continue by adding 10 knots to Vr and V2. Takeoff felt normal.
Data retrieved from NASA's ASRS site 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.