S2088-4 – Textron Aviation OEM Switch (Toggle or Push-Pull)
Available now on the Airparts.aero Marketplace.
Overview Section
The Textron Aviation S2088-4 is an Original Equipment Manufacturer (OEM) electrical switch designed for use in various high-reliability control circuits across the Textron Aviation fleet, including the Cessna Caravan and several Citation Jet models. As an OEM component, this switch is guaranteed to meet the specific fit, function, and electrical characteristics required by the aircraft's certified wiring diagrams and systems. While the exact function varies by installation location, switches in this family are typically used for discrete ON/OFF control of essential non-flight-critical systems.
The switch’s design is rugged, intended to operate reliably within the demanding cockpit and cabin environments, resisting vibration, temperature extremes, and frequent actuation cycles. Its use is standardized across multiple platforms, underscoring its reliability and versatility as an airborne electrical component.
Key Features Section
OEM Certified Quality: Manufactured to Textron Aviation's exacting specifications, ensuring electrical compatibility and mechanical longevity within certified aircraft systems.
Wide Application: Used across a range of high-utility aircraft, from the turboprop Caravan to various Citation business jets (including the Excel, XLS, and CJ4 series).
Discrete Control: Provides reliable ON/OFF or high/low selection for secondary electrical systems.
Flight-Grade Construction: Built using materials and contact mechanisms resistant to corrosion, dust, and common aviation fluids.
Standardized Interface: Designed for simple panel mounting, compatible with standard cockpit switch guards or legends.
Traceability: Supplied with mandatory airworthiness documentation (e.g., FAA Form 8130-3 or Certificate of Conformance) ensuring its certified status.
Technical Specifications Section
Part Number: S2088-4
Component Type: Electrical Switch (Type: Toggle, Rocker, or Push-Pull)
OEM Manufacturer: Textron Aviation (Cessna)
Function: Discrete ON/OFF Control (Exact function varies by airframe)
Voltage Rating: 28 VDC Nominal (Standard aircraft bus voltage)
Current Rating: Typically medium-to-low current capacity, suitable for solenoids, relays, or lighting circuits.
Mounting: Panel Mount, typically requiring a rectangular or circular panel cutout.
Application: Non-Flight-Critical Electrical Systems (e.g., lighting, heating, pumps, communication power).
Governing Specifications: Certified under FAA-PMA/OEM standards for use in Textron Aviation aircraft.
Aircraft Compatibility Section
Cessna Caravan/Grand Caravan: Used in various control panels within the cockpit and cabin.
Citation Excel / XLS / XLS+ / XLS Gen 2: Applications in the instrument panel and overhead panels.
Citation V / Ultra / Encore / Encore+: Used for specific system controls.
Citation CJ4 / CJ4 Gen 2 / CJ4 Gen 3: Utilized in control circuits for various systems.
Note: Due to its wide application range, the specific function and location (e.g., Aileron Trim OFF, Cabin Light Master, Fuel Pump Select) of the S2088-4 must be confirmed via the aircraft’s Wiring Diagram Manual (WDM) and Illustrated Parts Catalog (IPC).
Applications Section
Auxiliary Power Control: Switching on/off power to secondary communication or navigation systems.
Pump Control: Engaging low-current relays for fuel boost pumps or transfer pumps.
Lighting Master Control: Activating power to cabin, cockpit, or auxiliary exterior lights.
System Isolation: Used for maintenance or emergency isolation of specific electrical buses.
Why Choose the S2088-4?
The S2088-4 guarantees electrical integrity within the aircraft's complex system architecture. Substituting a generic or non-certified switch risks immediate or premature failure due to incompatible contact ratings, poor resistance to vibration, or non-compliant dimensions that compromise the panel's integrity. As an OEM component, the S2088-4 ensures that the switch's internal resistance, current handling capacity, and insulation properties are perfectly matched to the Textron Aviation system specifications, preventing shorts, fire hazards, or intermittent system operation. This is critical for maintaining the aircraft's airworthiness certification and ensuring reliable system functionality.
The reliability of the S2088-4 switch relies on the principle of minimizing contact bounce and maximizing arc suppression. In a high-vibration environment like an aircraft, particularly during engine start or turbulence, rapid, unintended opening and closing of contacts (bounce) can generate electrical noise that corrupts sensitive avionics signals. Furthermore, when switching inductive loads (like solenoids or motor fields), the rapid interruption of current can create a damaging electrical arc across the contacts. This switch is engineered with specific spring tension and contact materials to reduce bounce time and features robust design or external components (like snubbers) to mitigate arcing, which protects the switch's internal contacts from premature erosion and failure.
Note: The S2088-4 is a safety-critical component. Installation must be performed by a certified A&P or avionics technician strictly according to the Textron Aviation Wiring Diagram Manual (WDM), paying careful attention to terminal connections and proper switch function testing.
Documentation
Textron Aviation Wiring Diagram Manual (WDM): Essential for verifying the specific circuit function and wiring terminals for the S2088-4.
Textron Aviation Illustrated Parts Catalog (IPC): Required for definitive part number verification by aircraft model and location.