B737 captain experiences trailing edge flap asymmetry during approach and executes a go around. QRH ...

Narrative:

We were on ILS approach when we selected flaps 15 to configure for landing. We got a trailing edge split flap (asymmetry) with no roll. The left flap indicated flaps 10 and the right indicated flaps 5. We proceeded to do a missed approach to allow time to do the QRH procedures for the trailing edge flap asymmetry. We accomplished this procedure and notified the flight attendants and dispatch of the problem and that we would be doing a precautionary landing. We notified ATC and declared an emergency to have the emergency equipment standing by. We then proceeded to make a flaps 5 landing with no incident. We cleared the runway and taxied to the gate. I then called dispatch and let them know what happened and talked to maintenance control about the problem. Maintenance met the airplane and I handed it over to them.cause was due to a mechanical failure or indicating problem.

Original NASA ASRS Text

Title: B737 Captain experiences trailing edge flap asymmetry during approach and executes a go around. QRH procedures are complied with and an uneventful flaps 5 landing ensues.

Narrative: We were on ILS approach when we selected flaps 15 to configure for landing. We got a trailing edge split flap (asymmetry) with no roll. The left flap indicated flaps 10 and the right indicated flaps 5. We proceeded to do a missed approach to allow time to do the QRH procedures for the trailing edge flap asymmetry. We accomplished this procedure and notified the flight attendants and Dispatch of the problem and that we would be doing a precautionary landing. We notified ATC and declared an emergency to have the emergency equipment standing by. We then proceeded to make a flaps 5 landing with no incident. We cleared the runway and taxied to the gate. I then called Dispatch and let them know what happened and talked to Maintenance Control about the problem. Maintenance met the airplane and I handed it over to them.Cause was due to a mechanical failure or indicating problem.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	855756
Time
Date	200910
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Flap/Slat Indication
Person 1
Function	Pilot Flying Captain
Events
Anomaly	Aircraft Equipment Problem Critical

B737 captain experiences trailing edge flap asymmetry during approach and executes a go around. QRH procedures are complied with and an uneventful flaps 5 landing ensues.