Definition
A shared pipe or chamber in a hydraulic system that collects fluid flowing back from actuators, valves, and other components and routes it to the reservoir. It provides a single low-pressure path for return flow rather than running separate return lines from each component.
Plain English
A common pipe that gathers up used hydraulic fluid from various parts of the system and carries it back to the tank.
Context Anchor
Seen in aircraft engine fuel system descriptions, maintenance checks, and troubleshooting for fuel pressure or fuel leaks.
Derivation
A manifold is a pipe or chamber with several openings that joins multiple lines into one, or splits one line into many. 'Return' identifies its role: carrying fluid back to the reservoir after it has done its work.
Why Pilots Care
Proper function prevents fuel pressure fluctuations and vapor formation that could affect engine operation.
Analogy
Think of several small drain lines feeding into one larger drain pipe. The return manifold is that shared path for fuel that is being sent back.
Intuition Check
“Return” does not mean the aircraft is returning somewhere. Here it means fuel is flowing back through the system instead of continuing to the engine.
Example Sentence 1
After the landing gear retracted, fluid from the actuator flowed through the return manifold back to the reservoir.
Example Sentence 2
Excess fuel from the nozzles flows through the return manifold before re-entering the tank.