A B737-700 on approach experienced asymmetrical flap problem. The crew declared an emergency; extended the flaps to 15 degrees with the alternate system; and continued to a landing.

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Attributes
ACN	709115
Time
Date	200609
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi.tracon tower : atl.tower
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 193 flight time type : 8000
ASRS Report	709115
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 259 flight time type : 3500
ASRS Report	709111
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On approach into ZZZ; our flaps struck symmetrically at less than 1 degree. The leading edge flaps transit light was illuminated. Leading edge devices showed 'mid' position. We used the alternate flap extension procedure and landed flaps 15 degrees. We declared an emergency. All required procedures were followed.

Original NASA ASRS Text

Title: A B737-700 ON APCH EXPERIENCED ASYMMETRICAL FLAP PROB. THE CREW DECLARED AN EMER; EXTENDED THE FLAPS TO 15 DEGS WITH THE ALTERNATE SYS; AND CONTINUED TO A LNDG.

Narrative: ON APCH INTO ZZZ; OUR FLAPS STRUCK SYMMETRICALLY AT LESS THAN 1 DEG. THE LEADING EDGE FLAPS TRANSIT LIGHT WAS ILLUMINATED. LEADING EDGE DEVICES SHOWED 'MID' POS. WE USED THE ALTERNATE FLAP EXTENSION PROC AND LANDED FLAPS 15 DEGS. WE DECLARED AN EMER. ALL REQUIRED PROCS WERE FOLLOWED.

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.