50-380048-1 - Textron Aviation OEM Sealed Relay

50-380048-1 – Textron Aviation OEM Sealed Relay

Available now on the Airparts.aero Marketplace.

Overview

The Textron Aviation 50-380048-1 is a genuine OEM, flight-critical, hermetically sealed relay, engineered for use in the landing gear control systems of various Beechcraft King Air and 1900 series aircraft. This is not a standard industrial relay; it is a high-reliability component designed to function flawlessly in the harsh environmental conditions of an aircraft. Its primary role is to act as an electrical switch, using a low-power control signal to manage the high-power circuits that operate the landing gear hydraulic pump and valve solenoids. The sealed design ensures maximum protection against moisture, corrosion, and contamination, providing the long-term reliability required for this critical safety system.

Key Features

• Hermetically Sealed Construction: The relay is housed in a sealed enclosure, protecting the internal coil and contact mechanisms from moisture, dust, hydraulic fluid, and other contaminants found in the landing gear wheel well. This prevents contact corrosion and ensures reliable switching performance.
• 4PDT Contact Configuration: Features a Four-Pole, Double-Throw (4PDT) contact arrangement. This provides four separate sets of changeover contacts, allowing the single relay to control multiple, independent circuits simultaneously, which is essential for complex landing gear logic.
• High-Reliability Contacts: The internal contacts are designed for a long service life with low contact resistance, ensuring efficient power transfer to the landing gear system components.
• Vibration and Shock Resistance: Built to rigorous aerospace standards, this relay is designed to withstand the high vibration and G-forces associated with takeoff, landing, and ground operations without intermittent failures or false actuations.
• Genuine Textron OEM Part: As a genuine factory component specified for Beechcraft aircraft, it guarantees perfect integration with the landing gear control module, correct pin-out configuration, and the certified quality required for a flight-critical system.

Technical Specifications

• Part Number: 50-380048-1
• Component Type: Sealed Electrical Relay
• Primary Application: Landing Gear Control System
• Coil Voltage: 24 VDC
• Contact Configuration: 4PDT (4 Form C)
• Contact Current Rating: 3 Amps
• Enclosure: Hermetically Sealed
• Mounting: Panel / Chassis Mount
• Certification: FAA Production Approval

Aircraft Compatibility

The 50-380048-1 is a specific component for the landing gear systems of some of the most successful turboprop aircraft ever built. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) for final verification.

• Primary Aircraft Models:
  • Beechcraft King Air: 90, 100, 200 Series
  • Beechcraft 1900 Airliner

Applications

The 50-380048-1 is a key component in the logic and power circuits of the landing gear system:

• Landing Gear Actuation: Controls the flow of high-amperage current to the hydraulic pump motor or selector valves that direct hydraulic pressure to extend or retract the gear.
• Safety Logic & Indication: Part of the logic circuit that controls the gear-up and gear-down annunciator lights and the landing gear warning horn.
• System Troubleshooting: A key component to inspect and test when diagnosing an inoperative or intermittent landing gear system.

Why Choose 50-380048-1?

The landing gear system is one of the most critical safety systems on an aircraft. Its reliable operation depends on the integrity of every component in its control circuit. The 50-380048-1 is the genuine OEM relay designed by the manufacturer to provide a long, trouble-free service life in the hostile wheel well environment. Using a non-sealed or non-certified relay risks failure from corrosion or vibration, which could lead to a failure of the gear to extend or retract. For a system this critical, there is no substitute for a genuine Textron Aviation part.

Order Your 50-380048-1 Sealed Relay Now

Ensure the reliability of your aircraft's landing gear system with a genuine, factory-certified OEM component. Visit Airparts.aero to order your Textron Aviation 50-380048-1 sealed relays today.

The 50-380048-1 relay functions as an electromechanical switch. A low-current signal from the cockpit landing gear selector switch energizes an internal electromagnetic coil. This creates a magnetic field that pulls an armature, which mechanically forces four sets of contacts to simultaneously change state. In the "up" selection, it might power the hydraulic pump and direct fluid to the retract side of the actuators, while in the "down" position, it directs fluid to the extend side. The hermetic seal is crucial; by replacing the air inside with a dry, inert gas like nitrogen, it prevents the internal contacts from oxidizing. Oxidized contacts create high resistance, which leads to heat buildup and eventual failure of the relay. This sealed design ensures a clean, low-resistance connection for thousands of cycles.

Note: This is a flight-critical component. Installation and troubleshooting must be performed by a certified A&P mechanic with experience in King Air electrical and hydraulic systems, in accordance with the current Textron Aviation maintenance manual.