B787 first officer reported being called from his break two hours into flight; for fluctuating oil p...

Narrative:

I was the relief pilot on this flight. I was called an hour into my rest period to come back to the flight deck. The decision had been made to return; due to the right engine oil pressure indication. When I returned to the flight deck; I was briefed on the situation and that the right engine oil pressure indicator was fluctuating between low 40's to low 50's. Left engine was steady at 70. Was informed that maintenance told us to return because of prior history on the right engine. Followed all protocol and procedures for diverting. Ran all the appropriate checklists; including jettisoning fuel and fuel balancing. The captain and the operating first officer did a great job managing the situation and running all the appropriate checklists in a timely manner. We landed under max landing weight and fuel was balanced within the limits. No emergency was declared and none was needed as we had no warning or caution indication on the flight deck. Engine was operating normally other than the low oil pressure indication. The return was simply precautionary and following maintenance request.

Original NASA ASRS Text

Title: B787 First Officer reported being called from his break two hours into flight; for fluctuating oil pressure. Maintenance is contacted and instructs the crew to return to the departure airport.

Narrative: I was the relief pilot on this flight. I was called an hour into my rest period to come back to the flight deck. The decision had been made to return; due to the right engine oil pressure indication. When I returned to the flight deck; I was briefed on the situation and that the right engine oil pressure indicator was fluctuating between low 40's to low 50's. Left engine was steady at 70. Was informed that maintenance told us to return because of prior history on the right engine. Followed all protocol and procedures for diverting. Ran all the appropriate checklists; including jettisoning fuel and fuel balancing. The Captain and the operating first officer did a great job managing the situation and running all the appropriate checklists in a timely manner. We landed under max landing weight and fuel was balanced within the limits. No emergency was declared and none was needed as we had no warning or caution indication on the flight deck. Engine was operating normally other than the low oil pressure indication. The return was simply precautionary and following maintenance request.

Data retrieved from NASA's ASRS site 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	1398948
Time
Date	201610
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B787 Dreamliner Undifferentiated or Other Model
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Oil Pressure Indication
Person 1
Function	First Officer Relief Pilot Pilot Not Flying
Experience	Flight Crew Last 90 Days 239 Flight Crew Total 14500
Events
Anomaly	Aircraft Equipment Problem Less Severe

B787 first officer reported being called from his break two hours into flight; for fluctuating oil pressure. Maintenance is contacted and instructs the crew to return to the departure airport.