49131-2 - United Technologies Corporation High Pressure Fuel Filter

49131-2 – United Technologies Corporation High Pressure Fuel Filter

Available now on the Airparts.aero Marketplace.

Overview

The 49131-2 is a genuine OEM, flight-critical high-pressure fuel filter element, engineered by United Technologies Corporation (UTC) / Hamilton Sundstrand (now part of Collins Aerospace) for use in the fuel systems of various Auxiliary Power Units (APUs). This is not a standard airframe filter; it is a precision-engineered, last-chance filter designed to provide the ultimate protection for the APU's Fuel Control Unit (FCU), fuel pump, and fuel nozzles. Manufactured from a high-strength, stainless steel mesh media, the 49131-2 is designed to withstand the full pressure of the fuel system while capturing microscopic contaminants that could otherwise cause a catastrophic APU failure.

Key Features

• Micronic Stainless Steel Mesh Media: Features a woven, stainless steel wire mesh filter media, engineered to provide a precise and consistent filtration rating (typically in the 10-25 micron range). This captures the smallest and most damaging contaminants.
• High-Pressure Capability: The filter element is supported by a robust internal structure, allowing it to withstand the high differential pressures common in turbine engine fuel systems without collapsing or bypassing.
• Cleanable & Reusable: As a stainless steel mesh filter, it is designed to be cleaned, inspected, and reused in accordance with the APU's component maintenance manual. This offers a significant cost savings over disposable paper-media filters.
• Last-Chance System Protection: Typically installed just upstream of the Fuel Control Unit, it acts as the final "last-chance" barrier, protecting the FCU's extremely fine-tolerance servo valves and metering orifices from any contamination that may have passed through the main airframe filters.
• Genuine OEM Component: As a genuine part from the UTC/Collins Aerospace supply chain, it guarantees the correct micron rating, flow characteristics, and material composition required by the APU's original Type Certificate.

Technical Specifications

• Part Number: 49131-2
• Component Type: High-Pressure Fuel Filter Element
• OEM Manufacturer: Hamilton Sundstrand / UTC / Collins Aerospace
• Filter Media: Sintered Stainless Steel Wire Mesh
• Filtration Rating: Micronic (exact rating is proprietary to the CMM)
• Serviceability: Cleanable and Reusable
• Primary Function: Last-chance filtration for APU Fuel Control Unit.
• Certification: FAA Production Approval
• Alternate FAA-PMA: WF326058, WF328893

Aircraft Compatibility

The 49131-2 is a critical component for the fuel systems of some of the most common APUs installed in business and regional jets.

• Primary APU Models:
  • Sundstrand / Collins Aerospace: T-62T Series (e.g., T-62T-40C)
• Common Aircraft Platforms:
  • Bombardier: Challenger 600, 601; Learjet 60
  • Dassault Falcon: 50, 900
  • Gulfstream: GII, GIII
  • Hawker: 800, 1000

Applications

The 49131-2 is a key element for ensuring APU reliability:

• APU Fuel System Integrity: Its sole purpose is to ensure that the fuel reaching the Fuel Control Unit and fuel nozzles is perfectly clean, preventing clogging and ensuring proper atomization for a reliable start and stable operation.
• Scheduled Maintenance: A mandatory inspection and cleaning item at specified APU service intervals. It is inspected for contamination and damage, and replaced if it cannot be cleaned or is found to be damaged.

Why Choose 49131-2?

The Fuel Control Unit is the "brain" of the turbine engine, and its internal components have clearances measured in microns. A single particle of contamination can cause a servo valve to stick, leading to a hung start, an over-temperature event, or an in-flight shutdown of the APU. The 49131-2 is the small but essential component that prevents this. Using a genuine OEM part is the only way to ensure the filter has the correct, certified micron rating and the structural integrity to perform this flight-critical protective function without fail.

Order Your 49131-2 Fuel Filter Elements Now

Protect your APU's critical fuel system components with a genuine, certified OEM filter element. Visit Airparts.aero to inquire about new or serviceable 49131-2 fuel filters today.

The 49131-2 is a "last-chance" filter, a concept central to aerospace fluid system design. While the aircraft has main fuel filters, there is always a possibility of contamination being generated downstream of those filters (e.g., from a failing fuel pump or deteriorating hoses). The last-chance filter is a fine-micron, non-bypassing filter placed immediately before a critical component like the FCU. Its job is to catch any such internally generated debris. The stainless steel mesh construction is key; it is impervious to the high-velocity fuel flow and pressure pulses that could cause a paper or fiber media to shed its own material, which would defeat the purpose of the filter.

Note: This is a flight-critical engine component. Removal, cleaning, inspection, and reinstallation must be performed by a certified A&P or AME mechanic in strict accordance with the current Auxiliary Power Unit (APU) Component Maintenance Manual (CMM). A new set of O-rings or packings should be used upon reinstallation.

Description: Hi-Pressure Fuel Filter
Part Number: 49131-2
Superseded by: WF328893
FAA Eligibility [ Click Here ]
Alternate Part Numbers: WF328893, R9W1133, 49131-1, SP113, 212-510, 328893, 49131

Product Overview

A replaceable device designed to remove solid particles from fluids ranging in density from heavy liquids to gases. The removal of particles is accomplished by porous material (metallic or non-metallic), stacked disks, wound wire, or the like, constructed so the fluid can flow through the device while the solid particles are retained. It may be designed to fit into a filter, fluid (or similar cavity), or it may have an integral outer casing and mounting facilities and be designed to connect directly to an engine, compressor, or the like. The degree of removal of particles must be nominally rated at less than 50 microns or absolutely rated at less than 75 microns. Excludes filter element, air conditioning. See also strainer element, sediment.

 
Company Overview

The company was formed from the merger of Hamilton Standard and Sundstrand Corporation in 1999. In 2012, Hamilton Sundstrand was merged with Goodrich Corporation to form UTC Aerospace Systems. In 2018, UTC Aerospace Systems and Rockwell Collins combined to form Collins Aerospace.

 
Used as Hi-Pressure Fuel Filter on Auxiliary Power Unit (APU).

 
Includes in Next Higher Assembly: 9914283-1 and 9914283-3

 
Fits in:

**Cessna Aircraft Model 650 Citation III Illustrated Parts Catalog [ Click Here ]

See Page 3358, Figure 01, Item 1