Air carrier large transport aircraft flap and wing slat disagreement indication upon flap retraction after takeoff climb. Aircraft returned and landed.

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Attributes
ACN	214895
Time
Date	199206
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mex
State Reference	FO
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : mex tracon : iad
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7700 flight time type : 400
ASRS Report	214895
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During flap retraction after takeoff we got an EICAS message te flap disagree upon selecting 1 degree flaps from 5 degree position. Immediately after that, a second message appeared 'leading edge slat asymmetry' this was a repeat discrepancy, having been entered in the maintenance record at least twice in the previous 5 days. This incident occurred in mexico city ATC. There were some language and communications difficulties. There was a high speed (20 flap) high elevation landing. Additionally, there was high terrain and some scattered showers in the area. We completed the appropriate normal and abnormal checklist and returned to mexico city for an uneventful landing. One of the human performance considerations was for a short time period we (I) had an extremely high workload in order to complete all checklists and prepare for an approach. They were all completed with several checklist being covered at the same time.

Original NASA ASRS Text

Title: ACR LGT ACFT FLAP AND WING SLAT DISAGREEMENT INDICATION UPON FLAP RETRACTION AFTER TKOF CLB. ACFT RETURNED AND LANDED.

Narrative: DURING FLAP RETRACTION AFTER TKOF WE GOT AN EICAS MESSAGE TE FLAP DISAGREE UPON SELECTING 1 DEG FLAPS FROM 5 DEG POS. IMMEDIATELY AFTER THAT, A SECOND MESSAGE APPEARED 'LEADING EDGE SLAT ASYMMETRY' THIS WAS A REPEAT DISCREPANCY, HAVING BEEN ENTERED IN THE MAINT RECORD AT LEAST TWICE IN THE PREVIOUS 5 DAYS. THIS INCIDENT OCCURRED IN MEXICO CITY ATC. THERE WERE SOME LANGUAGE AND COMS DIFFICULTIES. THERE WAS A HIGH SPD (20 FLAP) HIGH ELEVATION LNDG. ADDITIONALLY, THERE WAS HIGH TERRAIN AND SOME SCATTERED SHOWERS IN THE AREA. WE COMPLETED THE APPROPRIATE NORMAL AND ABNORMAL CHKLIST AND RETURNED TO MEXICO CITY FOR AN UNEVENTFUL LNDG. ONE OF THE HUMAN PERFORMANCE CONSIDERATIONS WAS FOR A SHORT TIME PERIOD WE (I) HAD AN EXTREMELY HIGH WORKLOAD IN ORDER TO COMPLETE ALL CHKLISTS AND PREPARE FOR AN APCH. THEY WERE ALL COMPLETED WITH SEVERAL CHKLIST BEING COVERED AT THE SAME TIME.

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.