<< >> NASA ASRS Report 392176, January 1998

B767 aircraft on approach encountered windshear and extreme turbulence, executed go around. Airspeed stagnated then increased rapidly resulting in flap overspd. Flight crew had difficulty maintaining heading and altitude.

Attributes
ACN	392176
Time
Date	199801
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jfk
State Reference	NY
Altitude	msl bound lower : 1200 msl bound upper : 2850
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : jfk
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach landing : missed approach other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	392176
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	392175
Events
Anomaly	altitude deviation : overshoot inflight encounter : weather inflight encounter other other anomaly
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : regained aircraft control other other
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

During ILS final to runway 31R we encountered a violent windshear at approximately 2600 ft with extreme turbulence and an increase of 25 KTS. While executing a go around, the windshear warning sounded. Transition to escape maneuver was initiated with gear retracting and flaps at 20 degrees. Aircraft climb stagnated and then as climb began the airspeed immediately increased 25 KTS resulting in flap overspd. While still in very heavy turbulence, assigned altitude of 2500 ft was momentarily exceeded to 2850 ft. Assigned heading deviated by 30 degrees while aircraft recovery procedures were being accomplished. After cleanup, a non eventful divert to ewr was accomplished.

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Original NASA ASRS Text

Title: B767 ACFT ON APCH ENCOUNTERED WINDSHEAR AND EXTREME TURB, EXECUTED GAR. AIRSPD STAGNATED THEN INCREASED RAPIDLY RESULTING IN FLAP OVERSPD. FLC HAD DIFFICULTY MAINTAINING HDG AND ALT.

Narrative: DURING ILS FINAL TO RWY 31R WE ENCOUNTERED A VIOLENT WINDSHEAR AT APPROX 2600 FT WITH EXTREME TURB AND AN INCREASE OF 25 KTS. WHILE EXECUTING A GAR, THE WINDSHEAR WARNING SOUNDED. TRANSITION TO ESCAPE MANEUVER WAS INITIATED WITH GEAR RETRACTING AND FLAPS AT 20 DEGS. ACFT CLB STAGNATED AND THEN AS CLB BEGAN THE AIRSPD IMMEDIATELY INCREASED 25 KTS RESULTING IN FLAP OVERSPD. WHILE STILL IN VERY HVY TURB, ASSIGNED ALT OF 2500 FT WAS MOMENTARILY EXCEEDED TO 2850 FT. ASSIGNED HDG DEVIATED BY 30 DEGS WHILE ACFT RECOVERY PROCS WERE BEING ACCOMPLISHED. AFTER CLEANUP, A NON EVENTFUL DIVERT TO EWR WAS ACCOMPLISHED.

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.