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Flight crew of an medium large transport had difficulty attempting maximum gross weight takeoff without a tailwind component due to variable surface wind conditions. After changing runways based on the windsock's indicators, a 10 KT loss of airspeed was noted just after liftoff indicating that they did have a tailwind which had been reported by the tower prior to takeoff.
| Attributes | |
| ACN | 458260 |
| Time | |
| Date | 199912 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sna.airport |
| State Reference | CA |
| Altitude | agl single value : 100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : sna.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial climbout : takeoff ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 170 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 458260 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | inflight encounter other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : airspeed indicator other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact none taken : unable |
| Consequence | Other |
| Supplementary | |
| Problem Areas | ATC Human Performance Weather |
| Primary Problem | Weather |
Narrative:
Maximum weight takeoff at sna. Airport changed runway to runway 1L with reported wind 180 degrees, variable 300 degrees at 10 KTS. We taxied runway 1L and noted windsock indication of approximately 180 degrees at 5 KTS at runway end (runway 1L). Taxied back to runway 19R. Midfield windsock indicated 180 degrees at 5-8 KTS. Runway 19R windsock calm. At takeoff runway 19R, tower reported wind of 360 degrees, 12 KTS. Windsocks showed headwind. We did note loss of approximately 10 KTS at about 100 ft after normal takeoff. I think tower should note windsocks after being reported by pilots to other aircraft prior to takeoff and landing. At maximum weight we could not take off with any tailwind on the runway.
Original NASA ASRS Text
Title: FLC OF AN MLG HAD DIFFICULTY ATTEMPTING MAX GROSS WT TKOF WITHOUT A TAILWIND COMPONENT DUE TO VARIABLE SURFACE WIND CONDITIONS. AFTER CHANGING RWYS BASED ON THE WINDSOCK'S INDICATORS, A 10 KT LOSS OF AIRSPD WAS NOTED JUST AFTER LIFTOFF INDICATING THAT THEY DID HAVE A TAILWIND WHICH HAD BEEN RPTED BY THE TWR PRIOR TO TKOF.
Narrative: MAX WT TKOF AT SNA. ARPT CHANGED RWY TO RWY 1L WITH RPTED WIND 180 DEGS, VARIABLE 300 DEGS AT 10 KTS. WE TAXIED RWY 1L AND NOTED WINDSOCK INDICATION OF APPROX 180 DEGS AT 5 KTS AT RWY END (RWY 1L). TAXIED BACK TO RWY 19R. MIDFIELD WINDSOCK INDICATED 180 DEGS AT 5-8 KTS. RWY 19R WINDSOCK CALM. AT TKOF RWY 19R, TWR RPTED WIND OF 360 DEGS, 12 KTS. WINDSOCKS SHOWED HEADWIND. WE DID NOTE LOSS OF APPROX 10 KTS AT ABOUT 100 FT AFTER NORMAL TKOF. I THINK TWR SHOULD NOTE WINDSOCKS AFTER BEING RPTED BY PLTS TO OTHER ACFT PRIOR TO TKOF AND LNDG. AT MAX WT WE COULD NOT TAKE OFF WITH ANY TAILWIND ON THE RWY.
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.