Narrative:

Aircraft began to show significant oil loss in #2 engine. The oil quantity continued to decrease at a steady rate until the quantity gauge was at 0. The captain chose to continue to operate the aircraft as if there was not a problem. He made no contact with the company and made no plans for a precautionary landing. The aircraft was operated with the oil quantity reading 0 for approximately 40 mins. At 70 mi west of okc the oil pressure began to fluctuate and the captain chose to land at okc. The landing was made west/O declaring an emergency and west/O calling the company. My role as first officer and check airman giving a regular line check created a conflict as I began to question the appropriateness of the captain's judgement. I had determined that if the captain had not changed his priorities by the time we were 150 mi west of okc, I would take command. In the future, when giving line checks, I will do it from the observer's seat. This will give the captain the benefit of a complete crew west/O conflicting agendas. It will also provide me a single role to better evaluate the crew. Supplemental information from acn 163051: a diversion to okc was begun with a rapid descent because we were close into the airport. We began dumping fuel. First officer was given control of aircraft and ATC OM while second officer and I completed fuel dumping checklist. Diverted my attention to briefing F/a's and assuring myself that the cabin service items would be stowed prior to landing. By time this was done we were close into the airport. As I left the aircraft I called company dispatch on land line and gave a complete report of our situation.

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Original NASA ASRS Text

Title: ACR WDB LOST ENGINE OIL QUANTITY AT CRUISE ALT. WHEN OIL PRESSURE STARTED TO FLUCTUATE THE FLT CREW DIVERTED TO AN ALTERNATE.

Narrative: ACFT BEGAN TO SHOW SIGNIFICANT OIL LOSS IN #2 ENG. THE OIL QUANTITY CONTINUED TO DECREASE AT A STEADY RATE UNTIL THE QUANTITY GAUGE WAS AT 0. THE CAPT CHOSE TO CONTINUE TO OPERATE THE ACFT AS IF THERE WAS NOT A PROB. HE MADE NO CONTACT WITH THE COMPANY AND MADE NO PLANS FOR A PRECAUTIONARY LNDG. THE ACFT WAS OPERATED WITH THE OIL QUANTITY READING 0 FOR APPROX 40 MINS. AT 70 MI W OF OKC THE OIL PRESSURE BEGAN TO FLUCTUATE AND THE CAPT CHOSE TO LAND AT OKC. THE LNDG WAS MADE W/O DECLARING AN EMER AND W/O CALLING THE COMPANY. MY ROLE AS F/O AND CHK AIRMAN GIVING A REGULAR LINE CHK CREATED A CONFLICT AS I BEGAN TO QUESTION THE APPROPRIATENESS OF THE CAPT'S JUDGEMENT. I HAD DETERMINED THAT IF THE CAPT HAD NOT CHANGED HIS PRIORITIES BY THE TIME WE WERE 150 MI W OF OKC, I WOULD TAKE COMMAND. IN THE FUTURE, WHEN GIVING LINE CHKS, I WILL DO IT FROM THE OBSERVER'S SEAT. THIS WILL GIVE THE CAPT THE BENEFIT OF A COMPLETE CREW W/O CONFLICTING AGENDAS. IT WILL ALSO PROVIDE ME A SINGLE ROLE TO BETTER EVALUATE THE CREW. SUPPLEMENTAL INFO FROM ACN 163051: A DIVERSION TO OKC WAS BEGUN WITH A RAPID DSNT BECAUSE WE WERE CLOSE INTO THE ARPT. WE BEGAN DUMPING FUEL. F/O WAS GIVEN CTL OF ACFT AND ATC OM WHILE S/O AND I COMPLETED FUEL DUMPING CHKLIST. DIVERTED MY ATTN TO BRIEFING F/A'S AND ASSURING MYSELF THAT THE CABIN SVC ITEMS WOULD BE STOWED PRIOR TO LNDG. BY TIME THIS WAS DONE WE WERE CLOSE INTO THE ARPT. AS I LEFT THE ACFT I CALLED COMPANY DISPATCH ON LAND LINE AND GAVE A COMPLETE RPT OF OUR SITUATION.

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.