B757-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition
Aircraft
We were level at FL350. Received R ENG OIL PRESSURE low warning. It was coming down rapidly from 10 and was at 2 within 45 seconds to 1 min. Oil quantity fell to zero very rapidly as well. Immediately moved the throttle to idle. Checklist and Phase One's were run to secure the engine before any further damage was done to the right engine. We [advised ATC] and flew a hand flown ILS to a full stop at ZZZ. Fire Crash Rescue was requested; was present and looked over the jet after we cleared the runway. They said there was no smoke or other issues so we chose to taxi out of the way since XYL was the only open runway. We discussed taxiing in and felt that there was no reason to tie up the taxiway so we taxied to a back-up parking area and shut down. When the shutdown procedures were complete and the logbook was filled out; we went out to look at the engine. When the Maintenance (MX) personnel opened up the cowl there was some residual oil but MX told us that the reservoir was totally empty. They found a hole that didn't have a plug in it on the ADG. They looked in the cowling and sure enough it was sitting there. It must have come loose inflight and allowed all the oil to evacuate the engine. Not sure if it was a safety wired plug or not.Seems that an ADG plug came loose and fell out. All oil was evacuated from the engine reservoir causing the warnings and subsequent engine shutdown and [advising ATC] and landing short of [destination]. I am sure the proper Mx personnel will look into the drain plug and whether it was secured or not. [We] debriefed our emergency and spent more time trying to figure out how we did and where we could have possibly improved our efforts/procedures. Seems to have been a MX issue that happens. I am sure the MX QA personnel will be on this and have great ideas to keep it from happening again if there was even some human error involved.
B757 Captain reported an inflight shutdown due to loss of oil pressure. Post flight inspection revealed the ADG drain plug had come loose and allowed all the oil to drain out.