B757-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Deviation - Altitude Excursion From Assigned Altitude
Flight Crew Overcame Equipment Problem; Flight Crew Returned To Clearance; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
About 30 minutes after departure; right hydraulic quantity EICAS; a few moments later right reserve light; status page showed right hydraulic quantity .45. After discussion with Dispatch; returned to departure airport. The hydraulic quantity rose to .55 then back down to .45 and stayed there during the remainder of the flight. Aircraft operated normally from the point of hydraulic warning until the approach phase. Just prior to intercepting the localizer; at flaps 1 and 210 KTS; the autopilot pitched up at approximately 2 g's. The autopilot did not disconnect; but the First Officer immediately did so. The remainder of the flight was normal. Probably pitch up related to hydraulic problem.
B757 Captain experiences a right hydraulic quantity EICAS about 30 minutes after departure and returns to the departure airport. During approach; with the right hydraulic system operational and the autopilot engaged; a vigorous pitch up occurs. The autopilot does not disconnect but is quickly disengaged by the First Officer and a normal landing ensues.