Pipes, Hoses And Springs Flashcards
What benefits to higher quality tubing materials bring to a system assembly?
Easier to achieve the same operational pressure with reduction of the wall thickness
Where are steel lines used?
High pressure
Engine bay
Landing gear
What materials are medium to low pressure lines manufactured from?
Aluminium alloys for weight saving
After manufacturing, what process must be undertaken before a repair section is fitted to an aircraft system?
Cleaned out internally with compressed air
Proof tested
What criteria must be considered for the determination of minimum bend radius in rigid tubing assemblies?
Dependant on material, wall thickness and outer diameter
Lines must be able to connect to the connections exactly matching the axis and be free of tension
How is a tube assembly prepared before a bonded clamp is installed?
Ensure any paint or anodising is removed from the line where the clamp is fitted for electrical continuity
What is a bonded clamp?
Used to secure metal fuel, oil or hydraulic lines.
Has an electrical lead connected to the aircraft structure to ground the line
What devices are used to secure tube assemblies to aircraft structure?
Support clamps and bonded clamps
What is the purpose of the sleeve on a flared fitting?
The sleeve provides added strength and supports the tube to prevent vibration concentrating on the flare
What are vehicle and aircraft flare angles?
Vehicle - 45 degrees
Aircraft - 37 degrees
How should a leaking flared pipe be inspected?
Dismantled
Inspected
Cleaned
What two types of equipment are used to install flares in tubing and which is recommended?
Impact
Roll
Recommended - roll
What specification of tubing may double flares be installed?
Soft aluminium tubing with an outside diameter of 3/8 in or smaller can be double-flared to provide a stronger connection
Why would a double flare be used?
A double flare is smoother than a single flare and provides a better seal. It is more durable and resistant to the shearing effect of torque
What is recommended before commencing a bend using a hand tube bender?
Lightly lubricate the bend point