TYPES/VARIATIONS
Following design features and maintenance practices uphold the hydraulic system safety: (1) Design features and provisions - Failsafe design philosophy - Having safety components in the system design: Hydraulic Fuses, Priority valves, Relief Valves/Overpressure safety valves, Filters, Chip detectors (2) Preventive maintenances
FAIL SAFE DESIGN
Fail-safe design is the characteristic of almost every system of aircraft. Hydraulic failsafe is achieved by installation of following components/features: o Duplication/Triplication of the complete systems (coded as Blue, Green and Yellow hydraulic system). Each flying control is powered by at three systems independently. o Use of components like hydraulic fuse that stops fluid flow upstream incase of excessive fluid leakage down stream. o Components like accumulators can store pressure and drive components incase of failure of main pumps or engines. o Duplication/Triplication of powering units like, engine driven pumps, electric motor pumps, PTUs, hand pumps, RAT (ram air turbines) so that power can be sustained in spite of failure of the main powering devices or EDPs.
Following design features and maintenance practices uphold the hydraulic system safety: (1) Design features and provisions - Failsafe design philosophy - Having safety components in the system design: Hydraulic Fuses, Priority valves, Relief Valves/Overpressure safety valves, Filters, Chip detectors (2) Preventive maintenances
FAIL SAFE DESIGN
Fail-safe design is the characteristic of almost every system of aircraft. Hydraulic failsafe is achieved by installation of following components/features: o Duplication/Triplication of the complete systems (coded as Blue, Green and Yellow hydraulic system). Each flying control is powered by at three systems independently. o Use of components like hydraulic fuse that stops fluid flow upstream incase of excessive fluid leakage down stream. o Components like accumulators can store pressure and drive components incase of failure of main pumps or engines. o Duplication/Triplication of powering units like, engine driven pumps, electric motor pumps, PTUs, hand pumps, RAT (ram air turbines) so that power can be sustained in spite of failure of the main powering devices or EDPs.
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