A B727-200 crew, on final to ZZZ, experienced a split flap indication.

Attributes
ACN	544798
Time
Date	200204
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mem.airport
State Reference	TN
Altitude	agl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mem.tower
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 9000 flight time type : 100
ASRS Report	544798
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : flap position indicator other flight crewa other flight crewb other other : 3
Resolutory Action	controller : provided flight assist flight crew : executed go around
Consequence	faa : reviewed incident with flight crew other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Split flap indication with circuit breaker tripped. Reset breaker and re-attempted approach and landing. Indicated zero degrees outboard, 30 degrees inboard on short final. Went missed and troubleshot. Reset circuit breaker and ran emergency procedure. After resetting breaker got 15 degrees outboard and 25 degrees inboard with flap handle at 15 degrees. After going through checklist, selected flaps 25 degrees and then 30 degrees and got normal indications. Puzzling how both indicators could be wrong when only outboard breaker popped.

Original NASA ASRS Text

Title: A B727-200 CREW, ON FINAL TO ZZZ, EXPERIENCED A SPLIT FLAP INDICATION.

Narrative: SPLIT FLAP INDICATION WITH CIRCUIT BREAKER TRIPPED. RESET BREAKER AND RE-ATTEMPTED APCH AND LNDG. INDICATED ZERO DEGS OUTBOARD, 30 DEGS INBOARD ON SHORT FINAL. WENT MISSED AND TROUBLESHOT. RESET CIRCUIT BREAKER AND RAN EMER PROC. AFTER RESETTING BREAKER GOT 15 DEGS OUTBOARD AND 25 DEGS INBOARD WITH FLAP HANDLE AT 15 DEGS. AFTER GOING THROUGH CHKLIST, SELECTED FLAPS 25 DEGS AND THEN 30 DEGS AND GOT NORMAL INDICATIONS. PUZZLING HOW BOTH INDICATORS COULD BE WRONG WHEN ONLY OUTBOARD BREAKER POPPED.

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.