A B737-800 on approach at 8000 ft declared an emergency due to trailing edge flaps jammed at less than 1 degree. Suspect water frozen in flap actuator.

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Attributes
ACN	563667
Time
Date	200210
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 8000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon tower : poc.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 24l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	53667
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	563668
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : tie flap position indicator other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Consequence	other other
Supplementary
Problem Areas	Aircraft Weather
Primary Problem	Aircraft

Narrative:

On approach into lax, trailing edge flaps jammed at less than 1 degree. Emergency declared and aircraft landed uneventfully. Callback conversation with reporter revealed the following information: the reporter stated on arrival at their departure airport, the crew was assigned another airplane and left the station with no information on maintenance findings. The reporter said several days later, going through the same station, it was rumored it may have been caused by water frozen in one or more flap transmissions.

Original NASA ASRS Text

Title: A B737-800 ON APCH AT 8000 FT DECLARED AN EMER DUE TO TRAILING EDGE FLAPS JAMMED AT LESS THAN 1 DEG. SUSPECT WATER FROZEN IN FLAP ACTUATOR.

Narrative: ON APCH INTO LAX, TRAILING EDGE FLAPS JAMMED AT LESS THAN 1 DEG. EMER DECLARED AND ACFT LANDED UNEVENTFULLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED ON ARR AT THEIR DEP ARPT, THE CREW WAS ASSIGNED ANOTHER AIRPLANE AND LEFT THE STATION WITH NO INFO ON MAINT FINDINGS. THE RPTR SAID SEVERAL DAYS LATER, GOING THROUGH THE SAME STATION, IT WAS RUMORED IT MAY HAVE BEEN CAUSED BY WATER FROZEN IN ONE OR MORE FLAP TRANSMISSIONS.

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.