3119855-01 - Pratt & Whitney OEM Fuel Nozzle Manifold Assembly Adapter

3119855-01 – Pratt & Whitney OEM Fuel Nozzle Manifold Assembly Adapter

Available now on the Airparts.aero Marketplace.

The Pratt & Whitney 3119855-01 is a flight-critical, OEM fuel nozzle manifold assembly adapter designed specifically for high-performance turboprop and turboshaft powerplants, including variants of the widespread PT6A engine family. This component serves as the precise structural and fluidic interface between the external fuel manifold delivery tubes and the gas turbine combustion chamber's high-pressure fuel nozzles. Operating under demanding thermodynamic gradients and intense pressure cycles, the 3119855-01 ensures a completely sealed, leak-free pathway for metered aviation fuel to migrate safely into the atomization stage, maintaining optimal combustion flame stability and uniform turbine inlet temperature profiles.

Precision-machined from a high-grade, corrosion-resistant nickel-chromium superalloy matrix, this adapter assembly is engineered to withstand extreme ambient temperatures within the engine accessory and core cowlings without deforming or experiencing material degradation. It incorporates high-tolerance seating faces and indexing keys that ensure the correct geometric orientation of the fuel nozzle spray pattern relative to the combustion liner's swirl cups. This exact spatial orientation is vital to preventing hot-spot development on the downstream turbine vane rings and first-stage compressor turbine blades, protecting the power plant from catastrophic thermal fatigue failure.

The Pratt & Whitney 3119855-01 represents the industry benchmark for fluid integrity and mechanical endurance in turboprop aviation. By prioritizing tight tolerances and rigorous non-destructive testing (NDT) standards during manufacturing, this adapter effectively isolates fuel delivery from external core air pressure variations. For engine maintenance facilities, commercial fleet operators, and global aviation procurement specialists, utilizing this genuine OEM component maintains the absolute integrity of the fuel scheduling loop, ensuring stable engine transitions from idle to maximum takeoff power.

Key Features

• High-Temperature Nickel-Chromium Matrix: Forged from an advanced superalloy designed to resist creep, oxidation, and thermal fatigue at continuous operational parameters.

• Precision Fluid Routing Geometry: Internally machined to minimize fuel flow turbulence, stabilizing supply pressure immediately before the nozzle atomization interface.

• Rigid Anti-Rotational Indexing: Engineered with integrated keying features to lock the fuel nozzle into its exact blueprint alignment, preventing spray pattern skewing.

• Dual-Zone Leak Isolation: Utilizes high-tolerance machined shoulders to maintain a gas-tight mechanical seal against high-pressure compressor discharge air ($P_3$).

• Flight Safety Critical Classification: Manufactured under strict quality controls to ensure repeatable material grain flow and eliminate internal microscopic casting voids.

Technical Specifications

• Part Number: 3119855-01

• Component Type: Fuel Nozzle Manifold Assembly Adapter

• OEM Manufacturer: Pratt & Whitney Canada (P&WC)

• ATA Chapter: Chapter 73 (Engine Fuel & Control)

• Material Composition: High-Performance Corrosion-Resistant Stainless Steel / Nickel-Base Superalloy

• Manufacturing Process: High-Precision Investment Casting & Final CNC Machining

• Sealing Interface: Metal-to-metal precision ground lap seat with sealing ring grooves

• Classification: Flight Safety Critical Part (FSCP)

• Export Control Rating: ECCN 9A991.c / Schedule B: 8411.91.7010

• Certification Status: OEM Certificate of Conformance (CoC), FAA Form 8130-3, or EASA Form 1 Dual Release

Aircraft & Engine Compatibility

• Pratt & Whitney Engines: PT6A Series Variants (including PT6A-68, PT6A-68C, and related regional/corporate high-power profiles).

• Airframe Applications: Beechcraft King Air Series, Textron Aviation T-6 Texan II, and associated high-utilization turboprop platforms.

• Note: The engine Illustrated Parts Catalog (IPC) and applicable Type Certificate Data Sheet (TCDS) represent the final authorities for specific serial number applicability and configuration control.

Applications

• Fuel Distribution Interface: Acts as the primary mechanical coupling securing fuel manifold transfer tubes directly to individual combustion chamber injection ports.

• Thermal Isolation Protection: Prevents intense combustor radiant heat from conducting back into the primary fuel lines, eliminating fuel boiling and downstream vapor lock.

Why Choose 3119855-01?

Installing a genuine OEM Pratt & Whitney 3119855-01 fuel nozzle adapter ensures the powerplant operates within its strict certified performance margins. Aftermarket or non-certified alternatives frequently suffer from minor dimensional variations at the seating shoulders or mismatched thermal expansion rates. These anomalies lead to P3 air wicking into the fuel flow or raw fuel leaking onto the external combustion case shroud, introducing severe fire hazards and causing asymmetric spray patterns. This fuel degradation can manifest as hung starts, compressor stalls, or rapid localized burning of the combustion liner. Sourcing fully traceable OEM hardware minimizes hot-section wear, safeguards the engine's core life, and prevents unscheduled engine removals.

The performance mechanics of the Pratt & Whitney 3119855-01 adapter turn on the principles of high-pressure boundary sealing and viscoelastic thermal expansion matching inside a high-velocity air-stream environment. Positioned directly at the boundary of the compressor discharge section, the adapter is subjected to continuous high-velocity P3 airflows. To maintain absolute sealing integrity without suffering from intergranular oxidation, the component relies on a specialized precipitation-strengthened alloy matrix. This metallurgical composition features uniform grain boundaries that minimize the localized creep rates typically encountered during intense thermal shock transitions.

When the engine accelerates from idle to maximum continuous power, the temperature differential across the adapter's physical length shifts rapidly. The internal geometry is engineered to match the exact coefficient of thermal expansion of the adjacent fuel manifold transfer tubes and the nozzle sheath. This prevents the generation of localized anisotropic structural stresses that could warp the mating seats, ensuring a perfectly uniform, symmetrical fluid interface that optimizes the Weber number and droplet size distribution inside the combustion liner swirl cup.

Note: The 3119855-01 is a flight-critical, safety-sensitive gas turbine engine component. Improper installation torque, carbon contamination on the lap seats, or reuse of distorted sealing rings can cause devastating fuel spraying leaks, localized hot-section burning, or core engine flameouts. Component installation, borescope inspection, and final fuel system pressure checks must be executed exclusively by a certified A&P mechanic with a Powerplant rating or an authorized engine MRO repair station in strict accordance with the applicable Pratt & Whitney Engine Maintenance Manual (EMM) Chapter 73. Always replace matching transfer tube O-rings and gaskets during every nozzle removal cycle.

Documentation

• Pratt & Whitney Canada Engine Maintenance Manual Reference Index Portal

• FAA Dynamic Regulatory System TCDS Index for P&WC Gas Turbine Engines

• No public-facing standalone engineering blueprint or dimensional CAD sheet is available for this proprietary part due to strict intellectual property and aviation security control parameters; all physical clearances must be verified directly via a licensed Pratt & Whitney technical publications subscription.