B767 flight crew reported an engine oil pressure gauge went blank on climb out. After consulting mai...

Narrative:

On takeoff roll; no land 3 message annunciation; continued take off. On climb out after 150 ft I noticed left engine oil pressure blank. Cleaned up on schedule and out of 10000 ft discussed situation and ran QRH. There was no option for oil pressure blank. We contacted dispatch/maintenance on satcom. Satcom was intermittent and kept cutting in and out. Leveled off at FL320 and auto throttles disconnected. Went through (paper) QRH and autothrottles would not re engage. Consulted QRH for power settings. Maintenance control initially said to continue without any oil pressure reading for left engine; since oil temperature and pressure were matched up on both engines. We asked them to dig deeper; referencing crossing the ocean on tracks. Maintenance then suggested returning to ZZZZ. The flight crew mentioned going to ZZZZ1; since it was closer; but were told to return to ZZZZ. We coordinated with cabin crew. We [advised ATC] prior to dumping fuel. Dumped approximately 9000 lbs. After dumping; initiated descent and received idle disagree message. Consulted the QRH. We received vectors and routing to ZZZZ and had an uneventful approach (clear vmc) until 400 ft; when we received an aural call out 'too low; gear' we confirmed gear down and locked and continued. At 200 ft heard 'too low terrain.' again we confirmed and verified gear down and locked and continued to an uneventful (overweight) landing.

Original NASA ASRS Text

Title: B767 flight crew reported an engine oil pressure gauge went blank on climb out. After consulting Maintenance; the crew returned to the departure airport with several erroneous GPWS warnings prior to landing.

Narrative: On takeoff roll; no land 3 message annunciation; continued take off. On climb out after 150 ft I noticed left engine oil pressure blank. Cleaned up on schedule and out of 10000 ft discussed situation and ran QRH. There was no option for oil pressure blank. We contacted dispatch/maintenance on SATCOM. SATCOM was intermittent and kept cutting in and out. Leveled off at FL320 and auto throttles disconnected. Went through (paper) QRH and autothrottles would not re engage. Consulted QRH for power settings. Maintenance control initially said to continue without any oil pressure reading for left engine; since oil temperature and pressure were matched up on both engines. We asked them to dig deeper; referencing crossing the ocean on tracks. Maintenance then suggested returning to ZZZZ. The flight crew mentioned going to ZZZZ1; since it was closer; but were told to return to ZZZZ. We coordinated with cabin crew. We [advised ATC] prior to dumping fuel. Dumped approximately 9000 lbs. After dumping; initiated descent and received idle disagree message. Consulted the QRH. We received vectors and routing to ZZZZ and had an uneventful approach (clear vmc) until 400 ft; when we received an aural call out 'too low; gear' We confirmed gear down and locked and continued. At 200 ft heard 'too low terrain.' Again we confirmed and verified gear down and locked and continued to an uneventful (overweight) landing.

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	1453085
Time
Date	201706
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Oil Pressure Indication
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 2955
Person 2
Function	Relief Pilot
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 10544
Events
Anomaly	Aircraft Equipment Problem Less Severe

B767 flight crew reported an engine oil pressure gauge went blank on climb out. After consulting maintenance; the crew returned to the departure airport with several erroneous GPWS warnings prior to landing.