While holding for WX to abate at destination airport; flight crew of B767 encounter windshear condit...

Attributes
ACN	665459
Time
Date	200507
Place
Locale Reference	airport : sdf.airport
State Reference	KY
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Weather Elements	Thunderstorm Windshear
Light	Night
Aircraft 1
Controlling Facilities	tracon : sdf.tracon tower : ogg.tower
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time total : 9000
ASRS Report	665459
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather other anomaly other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : stick shaker other flight crewa other flight crewb
Resolutory Action	flight crew : regained aircraft control flight crew : overrode automation flight crew : exited adverse environment
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

Approaching sdf from the west; we were descending for the arrival while deviating 30 mi south of a line of WX that extended up to the north of the field. Abeam cheri; we started receiving sdf wind reports from approach control which consisted of 3 consecutive wind readings over about 5 mins. Those readings were something close to 340 degrees at 20 KTS gusting to 50 KTS; 340 degrees at 20 KTS gusting to 54 KTS; and 340 degrees at 20 KTS gusting to 38 KTS. The first officer and I began discussing our options; and based on the radar returns north of the field; we entered the hold at awlee at 5000 ft this was done to better assess the situation and to possibly bide time for the storm to move to the southeast. The wind direction on the ehsi indicated 11 KTS from the wnw. We had just completed one turn in holding and were in the turn back to the south when we experienced the windshear. The first officer was flying and I called for maximum thrust as he was simultaneously applying said thrust. Airspeed gain/loss was negligible; pitch was steady; we had some quick roll oscillations; and we simultaneously accelerated from 220 KTS to 315 KTS or so. While accelerating; we received the stick shaker 3 times at speeds of approximately 230 KTS; 250 KTS; and 290 KTS. We entered smooth air at around 315 KTS; reduced to 290 KTS; climbed to 10000 ft; advised ATC of the event and proceeded to our alternate of bna. In retrospect; I believe this may have been a classic gust front situation. The clues should have been obvious to me based on the above noted field reports. I think our intentions were prudent based on the circumstances; however; I would have been well advised to hold further to the south. I had allowed myself 20 mi from the WX and there was an airbus 5 mi north of us on the approach to runway 35R. Those 2 factors conspired to lead me to believe I had adequate spacing from the WX.

Original NASA ASRS Text

Title: WHILE HOLDING FOR WX TO ABATE AT DEST ARPT; FLT CREW OF B767 ENCOUNTER WINDSHEAR CONDITIONS WHICH ACTIVATES STALL WARNING STICK SHAKER 3 TIMES DURING RECOVERY.

Narrative: APCHING SDF FROM THE W; WE WERE DSNDING FOR THE ARR WHILE DEVIATING 30 MI S OF A LINE OF WX THAT EXTENDED UP TO THE N OF THE FIELD. ABEAM CHERI; WE STARTED RECEIVING SDF WIND RPTS FROM APCH CTL WHICH CONSISTED OF 3 CONSECUTIVE WIND READINGS OVER ABOUT 5 MINS. THOSE READINGS WERE SOMETHING CLOSE TO 340 DEGS AT 20 KTS GUSTING TO 50 KTS; 340 DEGS AT 20 KTS GUSTING TO 54 KTS; AND 340 DEGS AT 20 KTS GUSTING TO 38 KTS. THE FO AND I BEGAN DISCUSSING OUR OPTIONS; AND BASED ON THE RADAR RETURNS N OF THE FIELD; WE ENTERED THE HOLD AT AWLEE AT 5000 FT THIS WAS DONE TO BETTER ASSESS THE SIT AND TO POSSIBLY BIDE TIME FOR THE STORM TO MOVE TO THE SE. THE WIND DIRECTION ON THE EHSI INDICATED 11 KTS FROM THE WNW. WE HAD JUST COMPLETED ONE TURN IN HOLDING AND WERE IN THE TURN BACK TO THE S WHEN WE EXPERIENCED THE WINDSHEAR. THE FO WAS FLYING AND I CALLED FOR MAX THRUST AS HE WAS SIMULTANEOUSLY APPLYING SAID THRUST. AIRSPD GAIN/LOSS WAS NEGLIGIBLE; PITCH WAS STEADY; WE HAD SOME QUICK ROLL OSCILLATIONS; AND WE SIMULTANEOUSLY ACCELERATED FROM 220 KTS TO 315 KTS OR SO. WHILE ACCELERATING; WE RECEIVED THE STICK SHAKER 3 TIMES AT SPDS OF APPROX 230 KTS; 250 KTS; AND 290 KTS. WE ENTERED SMOOTH AIR AT AROUND 315 KTS; REDUCED TO 290 KTS; CLBED TO 10000 FT; ADVISED ATC OF THE EVENT AND PROCEEDED TO OUR ALTERNATE OF BNA. IN RETROSPECT; I BELIEVE THIS MAY HAVE BEEN A CLASSIC GUST FRONT SIT. THE CLUES SHOULD HAVE BEEN OBVIOUS TO ME BASED ON THE ABOVE NOTED FIELD RPTS. I THINK OUR INTENTIONS WERE PRUDENT BASED ON THE CIRCUMSTANCES; HOWEVER; I WOULD HAVE BEEN WELL ADVISED TO HOLD FURTHER TO THE S. I HAD ALLOWED MYSELF 20 MI FROM THE WX AND THERE WAS AN AIRBUS 5 MI N OF US ON THE APCH TO RWY 35R. THOSE 2 FACTORS CONSPIRED TO LEAD ME TO BELIEVE I HAD ADEQUATE SPACING FROM THE WX.

Data retrieved from NASA's ASRS site as of January 2009 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.

While holding for WX to abate at destination airport; flight crew of B767 encounter windshear conditions which activates stall warning stick shaker 3 times during recovery.