182888 – Pratt & Whitney Aerospace Washer Spacer
Available now on the Airparts.aero Marketplace.
Overview
The Pratt & Whitney 182888 is a genuine OEM, flight-critical washer spacer engineered for use in the demanding environment of the Pratt & Whitney Canada (P&WC) PT6T "Twin-Pac" series of turboshaft engines. This is not a standard piece of hardware; it is a precision-machined component whose exact thickness, flatness, and material composition are specified by P&WC's original engineering drawings. Its primary function is to provide a precise, calibrated axial spacing between critical rotating or static components within the engine or its combining gearbox. As a genuine OEM part, it guarantees the absolute integrity required for safe and reliable turbine engine operation.
Key Features
- Precision-Machined Thickness: The most critical feature is its thickness, which is machined to exceptionally tight tolerances, often measured in ten-thousandths of an inch. This precision is essential for establishing and maintaining critical clearances within the engine.
- High-Strength Superalloy Construction: Fabricated from a specialized, high-strength, temperature-resistant aerospace alloy. This material is selected to withstand the extreme temperatures, high compressive loads, and vibrational environment of a turbine engine without warping, compressing, or degrading.
- Surface Treated for Performance: Features a perfectly flat and smooth surface finish to provide a uniform load-bearing surface, preventing localized stress concentrations and fretting corrosion between the components it separates.
- Engineered for Turbine Engines: Specifically designed to be part of a dynamic, high-speed assembly. Its material properties are chosen to have a coefficient of thermal expansion that is compatible with the surrounding engine components.
- Genuine P&WC OEM Part: As a genuine Pratt & Whitney Canada part, it is supplied with a complete, unbroken chain of traceability. This is the only way to ensure the component meets the stringent material and quality standards of the original engine type certificate.
Technical Specifications
- Part Number: 182888
- Component Type: Precision Washer Spacer / Shim
- Manufacturer: Pratt & Whitney Canada (P&WC)
- Material: High-Strength, Temperature-Resistant Aerospace Alloy (Proprietary)
- Finish: Precision Ground, specific finish per OEM drawing
- Dimensions: Proprietary to Pratt & Whitney. Thickness, ID, and OD are precisely controlled to OEM specifications.
- Certification: FAA / TCCA Production Approval with full traceability.
Aircraft Compatibility
The 182888 washer spacer is a specific component for the P&WC PT6T series engines, which are famously used on a variety of medium-lift twin-engine helicopters.
- Primary Engine Model:
- Pratt & Whitney Canada PT6T-3, PT6T-6 "Twin-Pac"
- Common Helicopter Platforms:
- Bell Helicopter: 212, 412, UH-1N Twin Huey
- Sikorsky: S-58T
Applications
This proprietary washer spacer is used in critical locations where precise alignment is key:
- Engine & Gearbox Assembly: Utilized within the engine's accessory gearbox, combining gearbox, or other internal assemblies to control the axial position and end play of shafts, gears, and bearings.
- Maintaining Critical Clearances: Ensures that the clearance between high-speed rotating components and static components is maintained at the precise dimension set by the engine designers.
- Mandatory Overhaul Component: Must be inspected for wear, fretting, and thickness during engine overhaul and replaced if it does not meet the exact specifications outlined in the engine's overhaul manual.
Why Choose 182888?
In a high-RPM turbine engine like the PT6T, an incorrect clearance of even a few thousandths of an inch can lead to component interference, destructive vibration, and catastrophic engine failure. The 182888 washer spacer is an engineered solution that sets these critical clearances. Using a genuine P&WC part is the only way to guarantee the fastener has the exact, certified thickness and material properties required by the engine's design. There is absolutely no substitute for genuine OEM hardware when building or maintaining a turbine engine.
Order Your 182888 Washer Spacers Now
Ensure the precision, safety, and reliability of your turbine engine overhaul with genuine Pratt & Whitney Canada components. Visit Airparts.aero to order your 182888 washer spacers today.
The 182888 washer spacer's function is fundamental to the concept of "dimensional stacking" in complex mechanical assemblies. Engineers design a system with numerous parts assembled together, and the final clearance or position of a critical component is the sum of the tolerances of every part in that stack. The 182888 is often a "selected fit" part, meaning that during initial assembly, a technician measures the stack-up and selects a spacer of a specific thickness from a range of available sizes to achieve the perfect final dimension. Its precise, verified thickness is therefore essential to the entire assembly's performance. The use of a high-stability alloy ensures this dimension does not change under the immense compressive loads and thermal stresses of engine operation.
Note: This is a flight-critical engine internal component. Its selection and installation must be performed by a certified and qualified turbine engine technician or overhaul facility in strict accordance with the current Pratt & Whitney Canada Overhaul Manual. All associated parts must be measured to determine the correct size/thickness of the required washer spacer.
