SUNDSTRAND PESCO FUELPUMP ROTARY POWER DRIVEN 025277-300 PE-4170 – 2

• Manufacturer: Sundstrand (formerly Pesco Products, a renowned brand in aerospace hydraulics, often referenced as Sundstrand Pesco).
• Part Number: 025277-300
• NSN / Equipment Code: PE-4170 (This is a U.S. Air Force Equipment Code for “Pumps, Rotary, Power-Driven, Aircraft”).
• Type: Rotary, Positive Displacement, Power-Driven Hydraulic Pump. Designed for continuous-duty operation in demanding aerospace applications.
• Typical Use: This pump is aircraft equipment (ACFT EQPT), used to generate hydraulic pressure to power flight control actuators, landing gear systems, brakes, cargo doors, or other hydraulic subsystems on various aircraft platforms.

2. Key Specifications & Design Features:

• Drive Type: Power-Driven. It is mechanically driven, typically by the aircraft’s engine through an accessory drive pad, a gearbox, or an electrical motor. It is not a hand-operated pump.
• Pump Mechanism: Rotary design, most likely utilizing a gerotor, gear, or vane-type pumping element. Sundstrand Pesco was known for its high-performance, high-pressure gear pumps.
• Function: Converts mechanical input power (shaft rotation) into hydraulic power (fluid flow under pressure).
• Construction: Built to stringent aerospace standards from high-strength, lightweight materials (typically aluminum housings, steel gears/shafts). Designed for reliability and safety.
• Sealing: Features advanced sealing systems to prevent internal and external leakage under wide temperature and pressure ranges.
• Porting: Standard SAE or MS flared ports for integration into aircraft hydraulic systems (specifies would depend on the exact model).

3. Performance Characteristics (Generic for this pump class):

• Pressure Rating: Capable of operating at high pressures, typical for aircraft systems (e.g., 1500 to 3000+ PSI range).
• Flow Rate: Delivers a specific, relatively constant volumetric flow output proportional to its drive shaft speed (RPM).
• Fluid Compatibility: Designed for use with standard aerospace hydraulic fluids (e.g., MIL-PRF-5606, MIL-PRF-83282, or Skydrol types).
• Operating Environment: Rated for extreme conditions: wide temperature swings, high vibration, and varying altitudes.

4. Significance of Markings & Codes:

• 025277-300: The prime part number. Essential for exact identification, sourcing, and technical documentation lookup.
• PE-4170: The Federal Supply Group/Class code. PE = Pumps and Compressors, 4170 = Rotary, Power-Driven, Aircraft. This NSN prefix is critical for military logistics and procurement.