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Power supply circuits of the Boeing 757. Note the following:
- Three systems (left, centre & right) using seven pumps.
- Pumps:
* 2 engine driven (EDP) 3000 psi @ nearly 40 galls per minute.
* 4 electrically driven (ACMP). Pressure supply similar to above but flow rates very low (about 7 galls per minute).
* 1 RAT -- for emergencies -- manual or automatic deployment based on both engines low rpm -- also possibly connected to airspeed and weight switch inputs. Driven by a VP propeller and supplies about 2000 psi at about 1/4 of the normal pump flow rate.
* 1 air driven (additional pump of the 767 fitted to the centre system).
- Single point reservoir filling.
- Fire shut-off valves (SOV).
- Pressurised reservoirs.
- Fuel cooled heat exchangers.
- Power transfer unit -- comes on automatically when left engine rpm or left EDP pressure is lost. Is a >bent axis hydraulic motor< driving a hydraulic pump. About 2000 psi at about half the normal pump flow rate.