B767 crew had the leading edge flaps lock out during extension at jfk.

Attributes
ACN	498780
Time
Date	200101
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jfk.airport
State Reference	NY
Altitude	msl single value : 2000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : jfk.tower
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 22l 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	498780
Person 2
Affiliation	company : air carrier
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 : landed in emergency condition flight crew : declared emergency other
Consequence	other other
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Company
Primary Problem	Aircraft

Narrative:

Flap/slat failure. While lowering flaps to 25 degrees, leading edge slats failed, causing leading edge flap system to lock out. Followed flight manual procedures. Landed with flaps 20 degrees. Declared an emergency. Predictably, this was a repeat write-up. Uneventful landing, debriefed maintenance.

Original NASA ASRS Text

Title: B767 CREW HAD THE LEADING EDGE FLAPS LOCK OUT DURING EXTENSION AT JFK.

Narrative: FLAP/SLAT FAILURE. WHILE LOWERING FLAPS TO 25 DEGS, LEADING EDGE SLATS FAILED, CAUSING LEADING EDGE FLAP SYS TO LOCK OUT. FOLLOWED FLT MANUAL PROCS. LANDED WITH FLAPS 20 DEGS. DECLARED AN EMER. PREDICTABLY, THIS WAS A REPEAT WRITE-UP. UNEVENTFUL LNDG, DEBRIEFED MAINT.

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.