Date: 201510
Location: ZZZZ.ARTCC, US
Flight conditions: VMC
Aircraft: B767 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Cruise
Airspace: Class A ZZZ
ATC / advisory: Center ZZZ
Aircraft component: Powerplant Lubrication System
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Flying; First Officer
Human factors: Communication Breakdown; Troubleshooting
Second reporter function: Pilot Not Flying; Captain
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Landed in Emergency Condition; Flight Crew Inflight Shutdown
Contributing factors: Aircraft; Human Factors
Primary problem: Aircraft

Narrative: Approximately 300 plus miles west of ZZZZZ [intersection]; experienced total loss of oil quantity on left engine. Shortly thereafter; observed fluctuating and declining oil pressure. Oil pressure eventually declined into yellow caution zone; followed by EICAS alert. Pulled left engine throttle to idle. Coordinated with ATC for a return to . Once approved; we departed the track to the North; then proceeded direct to ZZZ; [notified ATC of the situation]; announced [intentions] on guard and common freqs; and descended from FL310 to FL260. Continued as flying pilot; while Captain and International Relief Officer (IRO); initiated QRH checklists; coordinated plan of action with ATC and Flight Attendants. Ran the fuel dump; loss of oil quantity; engine shutdown checklists. Continued a slow descent from FL260 to 10;000 feet to help burn off more fuel as we approached a couple hundred miles out of ZZZ. Transferred aircraft control to Captain and assumed Pilot Monitoring (PM) duties. Set up for a single engine approach; 20 Flaps; runway 8L; and briefed contingencies; (go around; hot brakes; etc). Landed heavyweight at 368 [K] lbs; speed 171 ref plus 5kts as target. Used Autobrakes 4; transitioning to manual brakes for complete stop. Turned off runway; chocked tires; and noted warm brakes on 3 tires of the right truck. Caution zone reached with levels above 6.0 on the right truck. Advised Fire squad on scene of possibility of fuse plug melt and they assisted with fans to cool the tires. Eventually; tires cooled below 5.0; and maintenance was permitted to approach aircraft with tug and we then were towed into gate. Textbook simulator profile; with fairly controlled pacing; step by step prioritization of tasks; accompanied by a safe and uneventful landing. Our most significant threat and distraction was trying to obtain assistance inflight from company. Extremely difficult in reaching Dispatch via SATCOM; for follow on coordination with maintenance. Was placed on hold; music in background; and we were cutoff at one point. Comm was very inadequate and inaccessible. We were left with the impression that there was little sense of urgency or prioritization of our situation. We found inflight company guidance and/or assistance nearly absent; useful or relevant.


Second narrative: In cruise flight FL310 1+30 after take off number 1 engine oil qty dropped to zero followed by a slow loss of oil pressure. requested clearance back to ZZZ. Followed QRH leading to the shutdown of the number 1 engine. Performed single engine landing on Runway 8L at ZZZ. Although we dumped fuel we landed at 368k 18K overweight. After landing brakes began to heat above safe limits. Emergency crew provided brake cooling. After brakes cooled to safe levels we were towed to gate.


Synopsis: The flight crew of a 767 aircraft reported a total loss of oil quantity; followed by a loss of oil pressure on one engine. The QRH checklist directed them to shut down the engine; resulting in a return to the departure airport. A successful overweight landing was accomplished.