<< >> NASA ASRS Report 987702, January 2012

A eastbound transatlantic air carrier flight diverted to a stateside airport after experiencing indications of low oil quantity and pressure and high oil temperature in the left engine.

Attributes
ACN	987702
Time
Date	201201
Local Time Of Day	0601-1200
Place
Locale Reference	CZUL.ARTCC
State Reference	PQ
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Powerplant Lubrication System
Person 1
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 10000 Flight Crew Type 3000
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 230 Flight Crew Total 14000 Flight Crew Type 3000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

We were in cruise at FL350 approaching baree; when I noticed that the left engine oil quantity was zero. I then checked all the other engine indications and discovered that the left engine oil pressure; while in limits; was about 100 psi lower and the oil temp was significantly higher than the right engine. I contacted maintenance control and dispatch on satcom. After reviewing all the indications and previous write-ups we concluded that the scavenge pump on the number 1 engine had failed; and that it could cause us to lose the engine enroute. He recommended we not cross the atlantic like this. Dispatch recommended we divert and we concurred. We dumped fuel down to below maximum landing weight and landed uneventfully. If this situation could have actually led to an in-flight shutdown; or worse; maybe there should be some EICAS indication associated with it. We had no indications other than the fact that I noticed the oil quantity was indicating zero.

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Original NASA ASRS Text

Title: A eastbound transatlantic air carrier flight diverted to a stateside airport after experiencing indications of low oil quantity and pressure and high oil temperature in the left engine.

Narrative: We were in cruise at FL350 approaching BAREE; when I noticed that the left engine oil quantity was zero. I then checked all the other engine indications and discovered that the left engine oil pressure; while in limits; was about 100 PSI lower and the oil temp was significantly higher than the right engine. I contacted Maintenance Control and Dispatch on SATCOM. After reviewing all the indications and previous write-ups we concluded that the scavenge pump on the number 1 engine had failed; and that it could cause us to lose the engine enroute. He recommended we not cross the Atlantic like this. Dispatch recommended we divert and we concurred. We dumped fuel down to below maximum landing weight and landed uneventfully. If this situation could have actually led to an in-flight shutdown; or worse; maybe there should be some EICAS indication associated with it. We had no indications other than the fact that I noticed the oil quantity was indicating zero.

Data retrieved from NASA's ASRS site as of July 2013 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.