A B737-300 developed a flap asymmetry as flaps were extended for landing.

Attributes
ACN	794892
Time
Date	200806
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	794892
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : executed go around flight crew : overcame equipment problem
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On approach to ZZZ during confign as flaps were commanded and selected to 15 degrees; crew noted that flap indicator showed that flaps had stopped at right 1.5 and left 2.9. Position indicator did not match selected position; showed a slight split and no leading edge flap transit light illuminated. Overhead panel showed normal leading edge extension. No roll-off was noted in flight attitude. Pilot monitoring selected flaps 15 degrees on command and noted discrepancy on flap position indicator. Crew executed a go around and missed approach at 2000 ft; requested delaying vectors and long downwind to run checklist for flap malfunction and landing at ZZZ.

Original NASA ASRS Text

Title: A B737-300 DEVELOPED A FLAP ASYMMETRY AS FLAPS WERE EXTENDED FOR LNDG.

Narrative: ON APCH TO ZZZ DURING CONFIGN AS FLAPS WERE COMMANDED AND SELECTED TO 15 DEGS; CREW NOTED THAT FLAP INDICATOR SHOWED THAT FLAPS HAD STOPPED AT R 1.5 AND L 2.9. POS INDICATOR DID NOT MATCH SELECTED POS; SHOWED A SLIGHT SPLIT AND NO LEADING EDGE FLAP TRANSIT LIGHT ILLUMINATED. OVERHEAD PANEL SHOWED NORMAL LEADING EDGE EXTENSION. NO ROLL-OFF WAS NOTED IN FLT ATTITUDE. PLT MONITORING SELECTED FLAPS 15 DEGS ON COMMAND AND NOTED DISCREPANCY ON FLAP POS INDICATOR. CREW EXECUTED A GAR AND MISSED APCH AT 2000 FT; REQUESTED DELAYING VECTORS AND LONG DOWNWIND TO RUN CHKLIST FOR FLAP MALFUNCTION AND LNDG AT ZZZ.

Data retrieved from NASA's ASRS site as of May 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.