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50-1-3100-00 – Goodrich Engine Pressure Pump Hydraulic Switch for CFM56 Engines
Available now on the Airparts.aero Marketplace.
Overview
The Goodrich 50-1-3100-00 is a flight-critical, high-pressure engine-driven pump (EDP) hydraulic switch, an essential sensor for the hydraulic systems on aircraft powered by CFM56 engines, such as the Airbus A320 and Boeing 737 NG. This is not a simple on/off switch; it is a precision-calibrated pressure sensor designed to monitor the output pressure of the primary engine-driven hydraulic pump. Its sole function is to provide a discrete electrical signal to the cockpit's EICAS/ECAM display and the aircraft's system logic computers when the pump's output pressure falls below a minimum safe threshold.
Manufactured by industry leaders in aerospace sensors like Hydra-Electric for Goodrich (now part of Collins Aerospace), this switch is engineered for extreme reliability in the high-pressure, high-vibration environment of the engine nacelle. Its integrity is fundamental to the aircraft's hydraulic system monitoring and fault detection capabilities.
Key Features
Hydraulic System Fault Detection: The primary safety function is to provide an immediate warning of low pressure from an engine-driven hydraulic pump. This alerts the flight crew to a potential pump failure or hydraulic fluid loss, allowing them to take corrective action.
High-Pressure Stainless Steel Construction: The body and all wetted components of the switch are machined from high-strength, corrosion-resistant stainless steel. This is essential to safely contain the 3000 PSI nominal system pressure and to resist the corrosive effects of Skydrol or other aviation hydraulic fluids.
Precision Pressure Setpoints: The switch is factory-calibrated to actuate (change state) at a specific, low-pressure setpoint (e.g., ~1800-2200 PSI) and de-actuate at a slightly higher pressure. These precise setpoints are critical for the accuracy of the fault-warning system.
Hermetically Sealed Design: The electrical switch component is hermetically sealed from the hydraulic sensing element. This prevents any possibility of hydraulic fluid leaking into the electrical system, a critical design requirement for flight safety.
Vibration and Temperature Hardened: Engineered and tested to perform reliably under the extreme G-forces, constant high-frequency vibration, and high temperatures found in a transport-category aircraft's engine nacelle.
Technical Specifications
Part Number: 50-1-3100-00
Component Type: High-Pressure Hydraulic System Switch
OEM Manufacturer (Typical): Hydra-Electric / Goodrich / Collins Aerospace
Primary Function: Provides low-pressure annunciation for the Engine-Driven Pump (EDP).
System Pressure: Designed for 3000 PSI nominal hydraulic systems.
Actuation / Deactuation Pressure: Factory-calibrated to specific pressure values (e.g., Actuates on falling pressure at ~1800 PSI, deactuates on rising pressure at ~2200 PSI).
Electrical Configuration: Typically Single Pole, Double Throw (SPDT).
Material: Stainless Steel
Certification: FAA / EASA Production Approval
Aircraft Compatibility
The 50-1-3100-00 is a critical sensor for the hydraulic systems of the world's most popular narrow-body airliners.
Primary Engine Model:
CFM International CFM56-5B & CFM56-7B series
Primary Aircraft Models:
Airbus A320ceo Family (A318, A319, A320, A321)
Boeing 737 Next Generation Family (737-600, -700, -800, -900)
Applications
The 50-1-3100-00 is a key element for flight deck awareness and system automation:
Fault Annunciation: Provides the signal that triggers the "HYD PUMP LO PR" or similar warning on the EICAS/ECAM display, alerting the crew to a system abnormality.
System Logic: The switch's signal can be used as an input to other systems, such as the Power Transfer Unit (PTU) logic, which may automatically activate a backup hydraulic pump in the event of a primary pump failure.
Why Choose 50-1-3100-00?
The hydraulic system powers the primary flight controls, landing gear, and brakes on a modern airliner. An undetected failure of a main engine-driven pump could have catastrophic consequences. The 50-1-3100-00 is the certified, high-reliability sensor that provides the first line of defense—a clear warning to the flight crew. Using a genuine OEM part is the only way to ensure the switch is calibrated to the precise pressure setpoints required by the aircraft manufacturer and is built to withstand the extreme environment without failure.
The 50-1-3100-00 is a sophisticated diaphragm-actuated pressure switch. Inside the stainless steel housing, the high-pressure hydraulic fluid acts on a small, sensitive metal diaphragm. This diaphragm is precisely engineered to remain in its normal position as long as the system pressure is above its deactuation setpoint (e.g., >2200 PSI). If the pump fails and the pressure drops, the diaphragm flexes past its actuation setpoint (e.g., <1800 PSI). This small physical movement is used to trip a hermetically sealed microswitch, changing the state of its electrical contacts from Normally Open to Closed (or vice-versa). This change of state provides the discrete (on/off) signal to the aircraft's warning computers. The use of a metal diaphragm, rather than an elastomer, is key to its long life and resistance to the corrosive properties of Skydrol hydraulic fluid.
Note: This is a flight-critical system component. Installation must be performed by a certified AME or A&P mechanic with the appropriate ratings, in strict accordance with the current Airbus or Boeing maintenance manual. The hydraulic system must be depressurized before installation. A full system functional check is required after installation.
