B757 crew had flap asymmetric lockout.

Attributes
ACN	446326
Time
Date	199908
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : tjsj.airport
State Reference	PR
Altitude	msl single value : 4000
Environment
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 10 other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	446326
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : executed missed approach
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Leading edge asymmetry. On approach to runway 10 sju, descending from 4000 ft, EICAS message displayed leading edge asymmetry and leading edges locked out at .5 degrees. Procedure initiated while approach continued. Missed approach initiated at 1000 ft due to flaps still being in transit to flaps 20 degrees. Procedure finished, returned to sju and landed.

Original NASA ASRS Text

Title: B757 CREW HAD FLAP ASYMMETRIC LOCKOUT.

Narrative: LEADING EDGE ASYMMETRY. ON APCH TO RWY 10 SJU, DSNDING FROM 4000 FT, EICAS MESSAGE DISPLAYED LEADING EDGE ASYMMETRY AND LEADING EDGES LOCKED OUT AT .5 DEGS. PROC INITIATED WHILE APCH CONTINUED. MISSED APCH INITIATED AT 1000 FT DUE TO FLAPS STILL BEING IN TRANSIT TO FLAPS 20 DEGS. PROC FINISHED, RETURNED TO SJU AND LANDED.

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.