Low level wind shear on approach and departure.

Attributes
ACN	273316
Time
Date	199406
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : slc
State Reference	UT
Altitude	agl bound lower : 100 agl bound upper : 100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc tower : slc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 500
ASRS Report	273316
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	inflight encounter other non adherence other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Just after we were turned over to final approach control, slc, another aircraft was warned of 15 KTS tailwind just above touchdown, with a headwind on the ground. We landed a few mins later, our INS showed 20-22 KTS tailwind at 1000 ft AGL. Tower called a headwind on the ground. When we brought this up to the tower, we were told that everyone was being told about it and they were trying to switch runways. We repeated the warning to tower about the wind shift as a PIREP. At no time did we hear any warnings given by tower to other airplanes. This was an 'increasing performance' wind shift for landing aircraft but a 'decreasing performance' for departing traffic, especially at 100 ft after takeoff. We departed about 1 hour later. The runways had been changed, there still was the 20 KT wind shift -- now an increasing performance shift for departing traffic and a decreasing performance for landing traffic. There was still no warning of the wind shift to either arriving or departing traffic.

Original NASA ASRS Text

Title: LOW LEVEL WIND SHEAR ON APCH AND DEP.

Narrative: JUST AFTER WE WERE TURNED OVER TO FINAL APCH CTL, SLC, ANOTHER ACFT WAS WARNED OF 15 KTS TAILWIND JUST ABOVE TOUCHDOWN, WITH A HEADWIND ON THE GND. WE LANDED A FEW MINS LATER, OUR INS SHOWED 20-22 KTS TAILWIND AT 1000 FT AGL. TWR CALLED A HEADWIND ON THE GND. WHEN WE BROUGHT THIS UP TO THE TWR, WE WERE TOLD THAT EVERYONE WAS BEING TOLD ABOUT IT AND THEY WERE TRYING TO SWITCH RWYS. WE REPEATED THE WARNING TO TWR ABOUT THE WIND SHIFT AS A PIREP. AT NO TIME DID WE HEAR ANY WARNINGS GIVEN BY TWR TO OTHER AIRPLANES. THIS WAS AN 'INCREASING PERFORMANCE' WIND SHIFT FOR LNDG ACFT BUT A 'DECREASING PERFORMANCE' FOR DEPARTING TFC, ESPECIALLY AT 100 FT AFTER TKOF. WE DEPARTED ABOUT 1 HR LATER. THE RWYS HAD BEEN CHANGED, THERE STILL WAS THE 20 KT WIND SHIFT -- NOW AN INCREASING PERFORMANCE SHIFT FOR DEPARTING TFC AND A DECREASING PERFORMANCE FOR LNDG TFC. THERE WAS STILL NO WARNING OF THE WIND SHIFT TO EITHER ARRIVING OR DEPARTING TFC.

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.