Air carrier large transport makes go around after losing partial control of aircraft on short final.

Attributes
ACN	242887
Time
Date	199305
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	agl bound lower : 100 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sna
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 760
ASRS Report	242887
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 185 flight time total : 16886 flight time type : 657
ASRS Report	242821
Events
Anomaly	inflight encounter other other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Flight into sna. Vectors for visual approach. ILS backup. Captain flying. Descent ATIS called headwind 20 gust 25 KTS. Next ATIS gust was gone. On final wind check called headwind 11 KTS. Map display showed headwind 11 KTS. (Direction about 15 degrees left of course.) event: on short final below 200 ft, above 100 ft, aircraft started to wing rock first left then right. Then as started back to left (may have been the other way around) the captain initiated go around procedures. Tower notified of turbulence on final. Visual approach was bumby but uneventful go around and second visual approach uneventful. No abnormal aircraft warnings. All system normal. Supplemental information from acn 242821: below 200 ft on short final, some light turbulence was experienced with wings rocking left and right. Maximum angle of bank up to 12 degrees to minimum altitude of 50 ft. Aircraft rocking and unable to dampen. Made missed approach followed by uneventful landing. Suspect wind shear and/or spoiler float.

Original NASA ASRS Text

Title: ACR LGT MAKES GAR AFTER LOSING PARTIAL CTL OF ACFT ON SHORT FINAL.

Narrative: FLT INTO SNA. VECTORS FOR VISUAL APCH. ILS BACKUP. CAPT FLYING. DSCNT ATIS CALLED HEADWIND 20 GUST 25 KTS. NEXT ATIS GUST WAS GONE. ON FINAL WIND CHK CALLED HEADWIND 11 KTS. MAP DISPLAY SHOWED HEADWIND 11 KTS. (DIRECTION ABOUT 15 DEGS L OF COURSE.) EVENT: ON SHORT FINAL BELOW 200 FT, ABOVE 100 FT, ACFT STARTED TO WING ROCK FIRST L THEN R. THEN AS STARTED BACK TO L (MAY HAVE BEEN THE OTHER WAY AROUND) THE CAPT INITIATED GAR PROCS. TWR NOTIFIED OF TURB ON FINAL. VISUAL APCH WAS BUMBY BUT UNEVENTFUL GAR AND SECOND VISUAL APCH UNEVENTFUL. NO ABNORMAL ACFT WARNINGS. ALL SYS NORMAL. SUPPLEMENTAL INFO FROM ACN 242821: BELOW 200 FT ON SHORT FINAL, SOME LIGHT TURB WAS EXPERIENCED WITH WINGS ROCKING L AND R. MAX ANGLE OF BANK UP TO 12 DEGS TO MINIMUM ALT OF 50 FT. ACFT ROCKING AND UNABLE TO DAMPEN. MADE MISSED APCH FOLLOWED BY UNEVENTFUL LNDG. SUSPECT WIND SHEAR AND/OR SPOILER FLOAT.

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.