An air carrier md-11 had to return land.

Attributes
ACN	277543
Time
Date	199407
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lhr
State Reference	FO
Altitude	msl bound lower : 25000 msl bound upper : 25000
Aircraft 1
Controlling Facilities	artcc : egtt
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	277543
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
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	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Approximately 25 min after departure from lhr at FL250, air manf 2 warn illuminated. Then air system 2 off. Dumped fuel and returned to lhr for maintenance.

Original NASA ASRS Text

Title: AN ACR MD-11 HAD TO RETURN LAND.

Narrative: APPROX 25 MIN AFTER DEP FROM LHR AT FL250, AIR MANF 2 WARN ILLUMINATED. THEN AIR SYS 2 OFF. DUMPED FUEL AND RETURNED TO LHR FOR 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.