B757 flight crew reported a left generator EICAS message in flight with loss of systems associated with load shedding. The flight crew elected perform an air turn back and a precautionary landing at departure airport.
Synopsis
B757 flight crew reported a left generator EICAS message in flight with loss of systems associated with load shedding. The flight crew elected perform an air turn back and a precautionary landing at departure airport.
Narrative
On the climbout at around 17;000 feet while on the L autopilot control yoke started to bump very slightly forward every few seconds; CA (Captain) switched to the C autopilot; same issue. Then switched to R autopilot the problem seemed to be resolved. Continuing on the climbout; at around 23;000 feet; the Captain's EFIS started flickering and as we climbed further the flickering worsened. We requested to level off at 30;000 feet and do a present position hold. Captain assigned the flying duties to me at this point. As we leveled off; the L GEN fault light illuminated and fault showed on EICAS; L CTR tank fault light also illuminated. As the captain was going through the QRH to resolve the issues; we agreed on [requesting priority handling] and return back to ZZZ. We prepared the airplane for arrival back to ZZZ. Captain briefed the FA and accomplished all the QRH; including the overweight landing checklist. Before commencing the ILS to ZZZ; we switched pilot duties and Captain assumed control again of the aircraft. Landed successfully in ZZZ.
Second reporter narrative
During climbout in mid 20s; pitch bumps felt and seen in flight controls. Shortly after this was noticed and remarked the Captain's flight instruments began to blank and recover independently of each other. Control of aircraft and radios given to First Officer as I considered getting a phone patch to Dispatch and Maintenance for troubleshooting; and a level off at FL300 along with a present position hold were requested and approved by ATC. Further malfunctions continued; with left center fuel pump low pressure; autothrottle disconnect and then left gen off all indicated by warning lights and EICAS alerts. Dispatch suggested an HF radio patch through ARINC. With the problems seeming to get worse I decided not to waste time trying to get an HF phone patch and the decision was made to [request priority handling] and return to ZZZ. Return accomplished as soon as all checklists and procedures were safely completed including the overweight landing checklist; which required about 10 minutes in delay vectors from Approach. The landing was overweight by approximately 32;000 pounds; normal smooth touchdown with Flaps 25 and ref speed around 163 knots. Landing roll with usual reverse thrust on [Runway] XXR with turn-off at [Taxiway] XX allowed the brake temperatures to remain in the low normal range during taxi-in. Maintenance entries made; Maintenance Control; Dispatch and local Maintenance briefed on all issues.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.