A B757-200 in cruise at FL370 diverted due to left engine loss of oil pressure and quantity caused by a failed gear box seal.

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Attributes
ACN	531994
Time
Date	200111
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia.airport
State Reference	US
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : muph.artcc tower : mdw.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 1000 flight time type : 70
ASRS Report	531994
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : left engine oil press and quantity other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Left engine oil pressure flux, then decrease. Oil quantity decrease to zero, oil pressure light illuminated. Left engine shut down by crew. En route from atlanta to grand cayman. Over cuba, decision made to divert to mia airport. Descent, approach, landing, rollout uneventful. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was directly over havana, cuba, when we made the turn to return to miami due to loss of oil pressure and quantity. The reporter said the cause of the loss of oil was a failed gear box oil seal.

Original NASA ASRS Text

Title: A B757-200 IN CRUISE AT FL370 DIVERTED DUE TO L ENG LOSS OF OIL PRESSURE AND QUANTITY CAUSED BY A FAILED GEAR BOX SEAL.

Narrative: L ENG OIL PRESSURE FLUX, THEN DECREASE. OIL QUANTITY DECREASE TO ZERO, OIL PRESSURE LIGHT ILLUMINATED. L ENG SHUT DOWN BY CREW. ENRTE FROM ATLANTA TO GRAND CAYMAN. OVER CUBA, DECISION MADE TO DIVERT TO MIA ARPT. DSCNT, APCH, LNDG, ROLLOUT UNEVENTFUL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS DIRECTLY OVER HAVANA, CUBA, WHEN WE MADE THE TURN TO RETURN TO MIAMI DUE TO LOSS OF OIL PRESSURE AND QUANTITY. THE RPTR SAID THE CAUSE OF THE LOSS OF OIL WAS A FAILED GEAR BOX OIL SEAL.

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.