B767-400 flight crew declared an emergency and diverted to land after the #1 engine oil quantity went to zero and the oil pressure started fluctuating. The engine was set to idle until after landing when the oil pressure dropped below red line and the engine was shut down during taxi in.

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Attributes
ACN	507548
Time
Date	200104
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : abq.airport
State Reference	NM
Altitude	msl single value : 33000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zab.artcc artcc : egtt.artcc
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 70 flight time total : 16000 flight time type : 6600
ASRS Report	507548
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : oil quantity and pressure other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Air carrier X lax to atl diverted to abq due low oil pressure. Approximately 1 hour into flight, first officer observed oil quantity on #1 (left) engine was zero, with no status messages and all other engine parameters normal. Problem was discussed with company dispatcher and maintenance. During this time frame, engine oil pressure began to fluctuate while still in normal range. Oil pressure began to decrease and decision was made to divert to abq. #1 thrust lever was moved to idle at maintenance's suggestion, and oil pressure stabilized in caution range, so engine was left running at idle for remainder of flight. Due to possibility that oil pressure would decrease to the red line limit, requiring engine shutdown prior to landing, a 20 degree flaps landing was accomplished with #1 engine remaining at idle. The decision to land 2000 pounds overweight was made due to the length of the runway (13000+ ft) and the decreasing oil pressure. On rollout, oil pressure did decrease below the red line and #1 engine was shut down as per procedure.

Original NASA ASRS Text

Title: B767-400 FLC DECLARED AN EMER AND DIVERTED TO LAND AFTER THE #1 ENG OIL QUANTITY WENT TO ZERO AND THE OIL PRESSURE STARTED FLUCTUATING. THE ENG WAS SET TO IDLE UNTIL AFTER LNDG WHEN THE OIL PRESSURE DROPPED BELOW RED LINE AND THE ENG WAS SHUT DOWN DURING TAXI IN.

Narrative: ACR X LAX TO ATL DIVERTED TO ABQ DUE LOW OIL PRESSURE. APPROX 1 HR INTO FLT, FO OBSERVED OIL QUANTITY ON #1 (L) ENG WAS ZERO, WITH NO STATUS MESSAGES AND ALL OTHER ENG PARAMETERS NORMAL. PROB WAS DISCUSSED WITH COMPANY DISPATCHER AND MAINT. DURING THIS TIME FRAME, ENG OIL PRESSURE BEGAN TO FLUCTUATE WHILE STILL IN NORMAL RANGE. OIL PRESSURE BEGAN TO DECREASE AND DECISION WAS MADE TO DIVERT TO ABQ. #1 THRUST LEVER WAS MOVED TO IDLE AT MAINT'S SUGGESTION, AND OIL PRESSURE STABILIZED IN CAUTION RANGE, SO ENG WAS LEFT RUNNING AT IDLE FOR REMAINDER OF FLT. DUE TO POSSIBILITY THAT OIL PRESSURE WOULD DECREASE TO THE RED LINE LIMIT, REQUIRING ENG SHUTDOWN PRIOR TO LNDG, A 20 DEG FLAPS LNDG WAS ACCOMPLISHED WITH #1 ENG REMAINING AT IDLE. THE DECISION TO LAND 2000 LBS OVERWT WAS MADE DUE TO THE LENGTH OF THE RWY (13000+ FT) AND THE DECREASING OIL PRESSURE. ON ROLLOUT, OIL PRESSURE DID DECREASE BELOW THE RED LINE AND #1 ENG WAS SHUT DOWN AS PER PROC.

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.