A B737-800 flight crew experienced a flap problem on short final that resolved itself on the ground without writing the problem up in the logbook at las, nv.

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Attributes
ACN	504930
Time
Date	200103
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : las.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25l other
Flight Phase	descent : vacating altitude ground : parked ground : taxi landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 7500 flight time type : 1600
ASRS Report	504930
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation non adherence : company policies non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : flap gauge other flight crewa
Resolutory Action	aircraft : equipment problem dissipated none taken : anomaly accepted
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

ATC instructed us to 'keep maximum speed to runway, traffic behind you, clear to land.' when we attempted to extend the flaps from 25-30 degrees, they would not extend. I told the captain the flaps would not extend to 30 degrees, he called for flaps 40 degrees and they still would not extend. We then tried to retract the flaps to 15 degrees and they would not retract. The captain said 'leave them at 25 degrees, then we have plenty of runway. The wind is straight down the runway and we have enough speed because I don't want to try and do a go around with the flaps not moving.' we then landed with flaps 25 degrees. We got approximately 3 terrain warnings due to the flap confign. We acknowledged them and continued. Once on the ground, I did the after landing check and the flaps retracted. We both were surprised at the flap's movement so we recycled the flaps a couple of times and they seemed to work ok, and to the best of my knowledge the captain did not make a maintenance logbook entry of the occurrence.

Original NASA ASRS Text

Title: A B737-800 FLC EXPERIENCED A FLAP PROB ON SHORT FINAL THAT RESOLVED ITSELF ON THE GND WITHOUT WRITING THE PROB UP IN THE LOGBOOK AT LAS, NV.

Narrative: ATC INSTRUCTED US TO 'KEEP MAX SPD TO RWY, TFC BEHIND YOU, CLR TO LAND.' WHEN WE ATTEMPTED TO EXTEND THE FLAPS FROM 25-30 DEGS, THEY WOULD NOT EXTEND. I TOLD THE CAPT THE FLAPS WOULD NOT EXTEND TO 30 DEGS, HE CALLED FOR FLAPS 40 DEGS AND THEY STILL WOULD NOT EXTEND. WE THEN TRIED TO RETRACT THE FLAPS TO 15 DEGS AND THEY WOULD NOT RETRACT. THE CAPT SAID 'LEAVE THEM AT 25 DEGS, THEN WE HAVE PLENTY OF RWY. THE WIND IS STRAIGHT DOWN THE RWY AND WE HAVE ENOUGH SPD BECAUSE I DON'T WANT TO TRY AND DO A GAR WITH THE FLAPS NOT MOVING.' WE THEN LANDED WITH FLAPS 25 DEGS. WE GOT APPROX 3 TERRAIN WARNINGS DUE TO THE FLAP CONFIGN. WE ACKNOWLEDGED THEM AND CONTINUED. ONCE ON THE GND, I DID THE AFTER LNDG CHK AND THE FLAPS RETRACTED. WE BOTH WERE SURPRISED AT THE FLAP'S MOVEMENT SO WE RECYCLED THE FLAPS A COUPLE OF TIMES AND THEY SEEMED TO WORK OK, AND TO THE BEST OF MY KNOWLEDGE THE CAPT DID NOT MAKE A MAINT LOGBOOK ENTRY OF THE OCCURRENCE.

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.