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Air carrier large transport altitude deviation overshot during climb out from den runway 35L. Gust winds and wind shear had been reported before takeoff.
| Attributes | |
| ACN | 133027 |
| Time | |
| Date | 199001 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 10000 msl bound upper : 10400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| 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 : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 39 flight time total : 8950 flight time type : 2010 |
| ASRS Report | 133027 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot inflight encounter : weather non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On departure from den runway 35L, strong gusty winds were apparent from the windsock, showing direct crosswind in excess of 20 KTS. The tower reported 4 KTS. An aircraft departing in sequence approximately 5 ahead of our departure reported a 15 KT loss and gain of airspeed at 400' AGL. Departures after this reported only moderate or better turbulence on initial climb. Numerous reports of turbulence were reported by the tower. We discussed delaying the takeoff or selecting a more favorable runway for departure. As we watched, the wind sock swung around to a direct headwind. The tower now cleared us for takeoff with wind 340 degrees at 22, gusts 34. We took off and experienced moderated turbulence on the climb. Approaching 9500' MSL, I reduced power by approximately 1/2 of climb thrust so as to level at 10000'. At this time we encountered an updraft, which caused the airspeed to increase from 230 KTS to 260 KTS. Our rate of climb increased to approximately 4000 FPM. Throttles were reduced further to near idle and pitch reduced below the horizon. No turbulence increase was associated with this updraft, but our altitude increased to approximately 10400' MSL prior to descent back to 10000'. The controller inquired as to our altitude and we reported descending through 10300 for 10000'. We included in this report the WX encountered. I know of no correction or procedure change that could help prevent this incident in the future.
Original NASA ASRS Text
Title: ACR LGT ALT DEVIATION OVERSHOT DURING CLIMB OUT FROM DEN RWY 35L. GUST WINDS AND WIND SHEAR HAD BEEN REPORTED BEFORE TKOF.
Narrative: ON DEP FROM DEN RWY 35L, STRONG GUSTY WINDS WERE APPARENT FROM THE WINDSOCK, SHOWING DIRECT XWIND IN EXCESS OF 20 KTS. THE TWR RPTED 4 KTS. AN ACFT DEPARTING IN SEQUENCE APPROX 5 AHEAD OF OUR DEP RPTED A 15 KT LOSS AND GAIN OF AIRSPD AT 400' AGL. DEPS AFTER THIS RPTED ONLY MODERATE OR BETTER TURB ON INITIAL CLB. NUMEROUS RPTS OF TURB WERE RPTED BY THE TWR. WE DISCUSSED DELAYING THE TKOF OR SELECTING A MORE FAVORABLE RWY FOR DEP. AS WE WATCHED, THE WIND SOCK SWUNG AROUND TO A DIRECT HEADWIND. THE TWR NOW CLRED US FOR TKOF WITH WIND 340 DEGS AT 22, GUSTS 34. WE TOOK OFF AND EXPERIENCED MODERATED TURB ON THE CLB. APCHING 9500' MSL, I REDUCED PWR BY APPROX 1/2 OF CLB THRUST SO AS TO LEVEL AT 10000'. AT THIS TIME WE ENCOUNTERED AN UPDRAFT, WHICH CAUSED THE AIRSPD TO INCREASE FROM 230 KTS TO 260 KTS. OUR RATE OF CLB INCREASED TO APPROX 4000 FPM. THROTTLES WERE REDUCED FURTHER TO NEAR IDLE AND PITCH REDUCED BELOW THE HORIZON. NO TURB INCREASE WAS ASSOCIATED WITH THIS UPDRAFT, BUT OUR ALT INCREASED TO APPROX 10400' MSL PRIOR TO DSCNT BACK TO 10000'. THE CTLR INQUIRED AS TO OUR ALT AND WE RPTED DSNDING THROUGH 10300 FOR 10000'. WE INCLUDED IN THIS RPT THE WX ENCOUNTERED. I KNOW OF NO CORRECTION OR PROC CHANGE THAT COULD HELP PREVENT THIS INCIDENT IN THE FUTURE.
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.