SUNDSTRAND PESCO FUEL PUMP ROTARY POWER DRIVEN 025277-300 PE-4994 #4

SUNDSTRAND PESCO FUEL PUMP ROTARY POWER DRIVEN 025277-300 PE-4994 #4

Technical Product Description: Sundstrand/Pesco Rotary Fuel Pump

1. Primary Identification & Manufacturer

• Manufacturer: Sundstrand Aviation (formerly Pesco Products Division). Sundstrand (now part of Collins Aerospace, a Raytheon Technologies company) is a legendary name in aerospace fuel and hydraulic systems.
• Part Number: 025277-300 (This is the primary, often dash-numbered, engineering part number).
• Alternate/Commercial Number: PE-4994 #4 (Commonly used in parts catalogs and commercial listings).
• Nomenclature: Rotary Power Driven Fuel Pump.
• SERIAL NO: PE-4994
• MODEL: 025277-300
• PARTS LIST NO: 025277-300-05
• UACL NO: CPW 3028125
• SUNDSTRAND AVIATION DIVISION

2. Product Type & Function

• Type: Positive displacement, rotary vane-type pump.
• Power Source: Power Driven (as opposed to an engine-driven pump). It is designed to be driven by an external power source, most commonly an electric motor, via a splined or coupled shaft. This makes it a boost pump or auxiliary fuel pump.
• Primary Function: To provide a reliable flow of fuel under pressure within an aircraft’s fuel system. Typical applications include:
  • Engine Feed / Boost Pump: Supplying a continuous, positive-pressure fuel flow to the engine-driven main fuel pump, preventing cavitation and ensuring smooth engine operation, especially at high altitudes.
  • Transfer Pump: Moving fuel from one tank to another to maintain aircraft balance.
  • APU (Auxiliary Power Unit) Feed Pump.

3. Key Technical Characteristics

• Design: Features a rotor with sliding vanes inside a cam-shaped housing. Centrifugal force and system pressure push the vanes against the housing, creating sealed chambers that move fuel from the inlet to the outlet.
• Materials: Typically constructed from aluminum alloy housings with corrosion-resistant steel for internal components (rotor, vanes, shaft) to ensure compatibility with aviation fuels (e.g., Jet A, Avgas) and long service life.
• Seals: Utilizes special fuel-resistant seals (e.g., Viton) to prevent internal and external leakage.
• Mounting: Standard aviation flange or base mounting with bolt holes.
• Ports: AN (Army-Navy) or MS (Military Standard) threaded fluid ports for inlet and outlet fuel lines.
• Drive Shaft: Splined or keyed shaft to connect to the driving motor.

4. Typical Applications
   This pump model was designed for and is commonly found on various general aviation, commercial, and military aircraft. It is a classic, robust pump used in many mid-20th century aircraft designs that remain in service. (Specific aircraft application should be verified via the manufacturer’s official documentation or a qualified parts distributor.)