Aircraft fluid systems rely on a network of tubing, hoses, and fittings to safely transport liquids and gases throughout the aircraft. These systems carry essential fluids such as fuel, oil, hydraulic fluid, coolant, oxygen, and instrument pressure lines. Proper installation and maintenance of fluid lines are critical to ensure reliable operation of aircraft systems.
Fluid lines in aircraft are commonly constructed from rigid metal tubing or flexible hose assemblies. Rigid fluid lines are used where straight runs and stationary installations are possible, providing strength and durability. Flexible hoses are typically installed where movement, vibration, or limited space requires greater flexibility.
During maintenance, damaged or worn fluid lines may need to be repaired or replaced. In many cases, repairs involve replacing sections of tubing with identical materials and dimensions. When replacement parts are not readily available, technicians may need to fabricate new tubing using proper bending, flaring, and fitting installation techniques.
Understanding the materials, fabrication methods, fittings, and inspection procedures used in aircraft fluid systems is essential for aviation maintenance technicians. The following series introduces the construction, identification, installation, and maintenance practices associated with aircraft fluid lines and fittings.
Fluid Lines and Fittings Series
1. Rigid Fluid Lines (Part 1): Materials and Fabrication
Introduction to rigid tubing materials, identification, tubing sizes, metal tube fabrication, bending methods, and flaring techniques.
View Topic →2. Rigid Fluid Lines (Part 2): Fittings and Installation
Covers fluid line identification, end fittings, MS flareless fittings, tubing installation procedures, inspection, and repair.
View Topic →3. Flexible Hose Fluid Lines
Overview of flexible hose assemblies, materials, installation practices, and inspection procedures used in aircraft systems.
View Topic →