A B737-800 on approach at 1500 ft, noted split flap indication. Executed missed approach. Ran flap a...

Attributes
ACN	604692
Time
Date	200401
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 1500
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	604692
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	604688
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : executed missed approach
Consequence	other other
Supplementary
Problem Areas	Chart Or Publication Aircraft
Primary Problem	Aircraft

Narrative:

At approximately 1500 ft AGL, we noticed a split flap indication on the trailing edge flap indicator/gage. Executed a missed approach and ran the most recent iteration to the flap abnormal checklist. Determined that the problem appeared to be the flap indicator fault variety and completed the appropriate procedure per the afm/QRH. Landed uneventfully. ZZZ ATC was very cooperative and gave us airspace and a box pattern down by the AFB to complete our procedure. Estimated time from miss to touchdown, approximately 10 mins. Callback conversation with the reporter revealed the following information: the reporter suspects the trailing edge flap position indicator was replaced as the indicator is an industry wide problem in causing asymmetrical flap shutoff problems. The reporter said the indicator has been the subject of several company alert bulletins and has resulted in flaps extension speed lowered by 10 KTS.

Original NASA ASRS Text

Title: A B737-800 ON APCH AT 1500 FT, NOTED SPLIT FLAP INDICATION. EXECUTED MISSED APCH. RAN FLAP ABNORMAL CHECKLIST AND THEN LANDED.

Narrative: AT APPROX 1500 FT AGL, WE NOTICED A SPLIT FLAP INDICATION ON THE TRAILING EDGE FLAP INDICATOR/GAGE. EXECUTED A MISSED APCH AND RAN THE MOST RECENT ITERATION TO THE FLAP ABNORMAL CHECKLIST. DETERMINED THAT THE PROB APPEARED TO BE THE FLAP INDICATOR FAULT VARIETY AND COMPLETED THE APPROPRIATE PROC PER THE AFM/QRH. LANDED UNEVENTFULLY. ZZZ ATC WAS VERY COOPERATIVE AND GAVE US AIRSPACE AND A BOX PATTERN DOWN BY THE AFB TO COMPLETE OUR PROC. ESTIMATED TIME FROM MISS TO TOUCHDOWN, APPROX 10 MINS. CALLBACK CONVERSATION WITH THE RPTR REVEALED THE FOLLOWING INFO: THE RPTR SUSPECTS THE TRAILING EDGE FLAP POSITION INDICATOR WAS REPLACED AS THE INDICATOR IS AN INDUSTRY WIDE PROB IN CAUSING ASYMMETRICAL FLAP SHUTOFF PROBS. THE RPTR SAID THE INDICATOR HAS BEEN THE SUBJECT OF SEVERAL COMPANY ALERT BULLETINS AND HAS RESULTED IN FLAPS EXTENSION SPEED LOWERED BY 10 KTS.

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.

A B737-800 on approach at 1500 ft, noted split flap indication. Executed missed approach. Ran flap abnormal checklist and then landed.