LEAK MEASUREMENT MANIFOLD (OPTIONAL)The optional leak measurement manifold supplies the flight controls ofthe RH wing, LH wing and tail section via three outputs. After closingthe related leak measurement valve, operating manually a spool valvelets the related section be supplied for leak measurement testing.RETURN MANIFOLDThe return manifold comprises:- one return filter with a clogging indicator and a by-pass device,- one temperature sensor which has one temperature switch and twotemperature transducers.The red pin of the clogging indicator comes out when the differentialpressure across the filter is more than 29 ± 4.4 psi (2 ± 0.3 bar). Theby-pass operates when the differential pressure across the filter is morethan 58 ± 6.0 psi (4.0 ± 0.4 bar). Then the device allows fluid to go frominlet to outlet without filtration. The temperature switch and temperaturetransducers send data for ECAM warnings and indication on overheadP/Bs.