5 Questions
Which type of tubing is used in general purpose systems of low and medium pressures, such as hydraulic and pneumatic 1,000 to 1,500 psi systems, and fuel and oil lines?
2024-T3 aluminum alloy
Where is corrosion resistant steel tubing extensively used?
High pressure hydraulic systems (3,000 psi or more)
In which type of aircraft hydraulic systems is Titanium 3AL-2.5V tubing extensively used?
Transport category and high performance aircraft hydraulic systems
What is the primary advantage of Titanium over steel for aircraft hydraulic systems?
30 percent stronger and 50 percent lighter than steel
Where is metal tubing sized according to the text?
Not specified in the text
Study Notes
Fluid Lines and Fittings
- Aircraft fluid lines are typically made of metal rigid tubing or flexible hose.
Rigid Tubing
- Used in stationary applications and where long, relatively straight runs are possible.
- Widely used in aircraft for fuel, oil, coolant, oxygen, instrument, and hydraulic lines.
Rigid Tubing Materials
- Three materials used in modern aircraft rigid tubing:
- Aluminum alloy
- Corrosion-resistant steel
- Titanium alloy
Aluminum Alloy Tubing
- Made from 1100 H14 or 3003 H14.
- Used for general purpose lines with low or negligible fluid pressures, such as:
- Instrument lines
- Ventilating conduits
Line Identification
- Decals must be installed to identify fluid lines.
Test your knowledge on aircraft fluid lines including rigid tube materials, connections, flex tube identification, and fabrication techniques.
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