A B757 engine lost all oil quantity and the pressure was low but maintenance suggested leaving the e...

Narrative:

The captain requested a phone patch with a maintenance engine controller. Once the patch was set up; the captain described low oil pressure on engine number one as well as zero indicated oil quantity. Maintenance advised that it sounded like a possible leak but as long as adequate pressure and temperature was still being maintained; no inflight shutdown was required immediately. The captain agreed to pull the throttle back to idle thrust and I prepared some metars and tafs for the nearest suitable diversion airports. The aircraft was between two suitable airports but both airports were experiencing low IFR ceilings of around 300 ft overcast with both forecast to go lower as the day progressed. The low IFR conditions were prevalent throughout the eastern plains to the south and north as well. The captain indicated that he was not comfortable with those ceilings and forecasts. A suitable airport was available to the east and was VFR but the captain was most comfortable diverting to a much larger airport which was also VFR but provided longer runways for the one engine landing. An emergency was declared by the captain and we agreed upon the divert station. The aircraft landed underweight on the runway with airport rescue and fire fighting equipment standing without incident.

Original NASA ASRS Text

Title: A B757 engine lost all oil quantity and the pressure was low but Maintenance suggested leaving the engine running since other indications were normal. An emergency was declared and the flight continued to a divert airport with the engine at idle thrust.

Narrative: The Captain requested a phone patch with a Maintenance Engine Controller. Once the patch was set up; the Captain described low oil pressure on engine number one as well as zero indicated oil quantity. Maintenance advised that it sounded like a possible leak but as long as adequate pressure and temperature was still being maintained; no inflight shutdown was required immediately. The Captain agreed to pull the throttle back to idle thrust and I prepared some METARs and TAFS for the nearest suitable diversion airports. The aircraft was between two suitable airports but both airports were experiencing low IFR ceilings of around 300 FT overcast with both forecast to go lower as the day progressed. The low IFR conditions were prevalent throughout the eastern plains to the south and north as well. The Captain indicated that he was not comfortable with those ceilings and forecasts. A suitable airport was available to the east and was VFR but the Captain was most comfortable diverting to a much larger airport which was also VFR but provided longer runways for the one engine landing. An emergency was declared by the Captain and we agreed upon the divert station. The aircraft landed underweight on the runway with Airport Rescue and Fire Fighting equipment standing without incident.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	925611
Time
Date	201012
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Lubrication Oil
Person 1
Function	Dispatcher
Qualification	Dispatch Dispatcher
Events
Anomaly	Aircraft Equipment Problem Critical

A B757 engine lost all oil quantity and the pressure was low but maintenance suggested leaving the engine running since other indications were normal. An emergency was declared and the flight continued to a divert airport with the engine at idle thrust.