An air carrier B767 flight crew experienced a pneumatic duct leak in the left air bleed system. The flight crew shut off the left engine bleed and diverted to an airport that had clear WX.

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Attributes
ACN	399521
Time
Date	199804
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pgs
State Reference	AZ
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	399521
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On takeoff received left duct leak EICAS message. Turned left engine bleed valve off. In-flight conferred with dispatch and maintenance regarding troubleshooting problem and alternate plans to avoid icing conditions at destination. Maintenance corrective procedure of left pack off and left engine bleed on worked temporarily, but left duct leak light recurred. We then diverted to sfo which was clear.

Original NASA ASRS Text

Title: AN ACR B767 FLC EXPERIENCED A PNEUMATIC DUCT LEAK IN THE L AIR BLEED SYS. THE FLC SHUT OFF THE L ENG BLEED AND DIVERTED TO AN ARPT THAT HAD CLR WX.

Narrative: ON TKOF RECEIVED L DUCT LEAK EICAS MESSAGE. TURNED L ENG BLEED VALVE OFF. INFLT CONFERRED WITH DISPATCH AND MAINT REGARDING TROUBLESHOOTING PROB AND ALTERNATE PLANS TO AVOID ICING CONDITIONS AT DEST. MAINT CORRECTIVE PROC OF L PACK OFF AND L ENG BLEED ON WORKED TEMPORARILY, BUT L DUCT LEAK LIGHT RECURRED. WE THEN DIVERTED TO SFO WHICH WAS CLR.

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.