Narrative:

Shut down #1 engine during cruise due to oil quantity indication approaching zero. Maintenance control consulted prior to shutdown and they agreed. Engine page appeared on lower ECAM showing 3.0 quarts with all other indications normal. Maintenance control contacted and decision was made to shut down as indication on quantity gauge continued to drop. We were directly over mso with airport in sight and clear skies. Dispatch recommended and we agreed to a divert to mso. Emergency was declared, engine shutdown checklist run, and uneventful visual approach and landing made at mso. I took control of the aircraft for approach and landing after the engine was secured. Landing weight was above normal maximum landing weight (approximately 151500 pounds), but smooth landing accomplished with no side loads in calm winds. Postflt inspection of #1 engine showed oil all over cowl on left side of engine. Callback conversation with reporter revealed the following information: the reporter stated the cause of the oil loss was not reported by maintenance. The reporter said an external check of the engine revealed oil all over the left side of the engine cowling. Callback from acn 522643 with reporter revealed the following information: the reporter stated the cause of the loss of oil was not reported to the crew by maintenance.

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Original NASA ASRS Text

Title: AN AIRBUS 320 IN CRUISE AT FL330 DECLARED AN EMER AND DIVERTED DUE TO L ENG LOSS OF OIL QUANTITY. CAUSE UNKNOWN.

Narrative: SHUT DOWN #1 ENG DURING CRUISE DUE TO OIL QUANTITY INDICATION APCHING ZERO. MAINT CTL CONSULTED PRIOR TO SHUTDOWN AND THEY AGREED. ENG PAGE APPEARED ON LOWER ECAM SHOWING 3.0 QUARTS WITH ALL OTHER INDICATIONS NORMAL. MAINT CTL CONTACTED AND DECISION WAS MADE TO SHUT DOWN AS INDICATION ON QUANTITY GAUGE CONTINUED TO DROP. WE WERE DIRECTLY OVER MSO WITH ARPT IN SIGHT AND CLR SKIES. DISPATCH RECOMMENDED AND WE AGREED TO A DIVERT TO MSO. EMER WAS DECLARED, ENG SHUTDOWN CHKLIST RUN, AND UNEVENTFUL VISUAL APCH AND LNDG MADE AT MSO. I TOOK CTL OF THE ACFT FOR APCH AND LNDG AFTER THE ENG WAS SECURED. LNDG WT WAS ABOVE NORMAL MAX LNDG WT (APPROX 151500 LBS), BUT SMOOTH LNDG ACCOMPLISHED WITH NO SIDE LOADS IN CALM WINDS. POSTFLT INSPECTION OF #1 ENG SHOWED OIL ALL OVER COWL ON L SIDE OF ENG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE OIL LOSS WAS NOT RPTED BY MAINT. THE RPTR SAID AN EXTERNAL CHK OF THE ENG REVEALED OIL ALL OVER THE L SIDE OF THE ENG COWLING. CALLBACK FROM ACN 522643 WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE LOSS OF OIL WAS NOT RPTED TO THE CREW BY 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.