Inboard wing flaps would not extend while taxiing out for takeoff.

Attributes
ACN	145003
Time
Date	199005
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 110 flight time total : 6000 flight time type : 3000
ASRS Report	145003
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

On taxi out, flaps selected to 15 degrees. Outboard flaps went to 15 degrees and so indicated. Inboard flaps remained up and so indicated. Flap handle in 15 degree detent and green leading edge light was illuminated. Speed brake/flap warning tested correctly (i.e., no horn). #3 throttle takeoff warning tested incorrectly (i.e., horn sounded). Visibility inspection showed inboard flaps up. Malfunction was not picked up from flap gauges until speed brake/flap warning test gave no horn. Returned to gate and maintenance replaced inboard flap gauge. The up and 15 degree needle positions are in line on these gauges. This situation with contributing factors has killed people in the past. Gauges have not been changed nor have I received any publications that this is a problem with the aircraft.

Original NASA ASRS Text

Title: INBOARD WING FLAPS WOULD NOT EXTEND WHILE TAXIING OUT FOR TKOF.

Narrative: ON TAXI OUT, FLAPS SELECTED TO 15 DEGS. OUTBOARD FLAPS WENT TO 15 DEGS AND SO INDICATED. INBOARD FLAPS REMAINED UP AND SO INDICATED. FLAP HANDLE IN 15 DEG DETENT AND GREEN LEADING EDGE LIGHT WAS ILLUMINATED. SPD BRAKE/FLAP WARNING TESTED CORRECTLY (I.E., NO HORN). #3 THROTTLE TKOF WARNING TESTED INCORRECTLY (I.E., HORN SOUNDED). VIS INSPECTION SHOWED INBOARD FLAPS UP. MALFUNCTION WAS NOT PICKED UP FROM FLAP GAUGES UNTIL SPD BRAKE/FLAP WARNING TEST GAVE NO HORN. RETURNED TO GATE AND MAINT REPLACED INBOARD FLAP GAUGE. THE UP AND 15 DEG NEEDLE POSITIONS ARE IN LINE ON THESE GAUGES. THIS SITUATION WITH CONTRIBUTING FACTORS HAS KILLED PEOPLE IN THE PAST. GAUGES HAVE NOT BEEN CHANGED NOR HAVE I RECEIVED ANY PUBLICATIONS THAT THIS IS A PROB WITH THE ACFT.

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.