A B737-400 on approach experienced uncommanded roll from a malfunctioning spoiler when flaps were extended beyond 15 degrees. Flaps retracted to 15 degrees and a normal landing was made.

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Attributes
ACN	703797
Time
Date	200607
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	agl single value : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : phl.tower
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 27r other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 120 flight time total : 18000 flight time type : 6000
ASRS Report	703797
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

When landing at phl ILS runway 27R at 1200 ft AGL selected flaps 30 degrees aircraft started buffeting and rolled to left. The first officer and I check for any abnormal lights or pressures and found all normal -- reselected flaps 15 degree; roll and buffeting stopped. Reset bugs 15 degree flaps and landed. Advised maintenance. Made logbook entry and filed a safety report. One spoiler on left wing was up about 3 inches.

Original NASA ASRS Text

Title: A B737-400 ON APCH EXPERIENCED UNCOMMANDED ROLL FROM A MALFUNCTIONING SPOILER WHEN FLAPS WERE EXTENDED BEYOND 15 DEGS. FLAPS RETRACTED TO 15 DEGS AND A NORMAL LNDG WAS MADE.

Narrative: WHEN LNDG AT PHL ILS RWY 27R AT 1200 FT AGL SELECTED FLAPS 30 DEGS ACFT STARTED BUFFETING AND ROLLED TO L. THE FO AND I CHK FOR ANY ABNORMAL LIGHTS OR PRESSURES AND FOUND ALL NORMAL -- RESELECTED FLAPS 15 DEG; ROLL AND BUFFETING STOPPED. RESET BUGS 15 DEG FLAPS AND LANDED. ADVISED MAINT. MADE LOGBOOK ENTRY AND FILED A SAFETY RPT. ONE SPOILER ON L WING WAS UP ABOUT 3 INCHES.

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.