30 Questions
What is the purpose of using O-rings in some applications instead of aluminium gaskets?
To provide a more secure seal
Why is the banjo fitting free to rotate before the bolt is torqued?
To allow for stress-free alignment of the fluid line to the component
What is a key feature of quick-disconnect couplings that allows for easy usage?
Self-sealing action
Why are quick-disconnect couplings commonly used on fuel, hydraulic, and water/waste servicing adaptors?
To prevent any spillage during connection and disconnection
In what scenario are rubber hose and screw-type hose clamps typically used together?
For large-diameter lines carrying low-pressure fluids
What is the purpose of beading in large-diameter lines?
To hold the rubber hose in place without detachment
How is the type, quarter and year of manufacture, and manufacturer's code identified on most hydraulic hoses?
By using contrasting coloured letters and numerals
What does the 'SKYDROL' marking on a hose indicate?
Suitability for use with phosphate ester-base hydraulic fluid
How is the size of a flexible hose determined?
By its inside diameter in 1/16 inch increments
What does a dash number, such as -10, indicate in hose sizing?
Tube diameter in 1/16 inch increments
Why are code markings used on hydraulic hoses?
To assist in replacing hoses with the same specifications
What is the purpose of lay lines and identification markings on flexible hoses?
To identify the type, quarter and year of manufacture, and manufacturer's code
Why is the design of the reinforcement layers in a hose considered critical?
To minimize dimensional changes when pressure is applied
What is the purpose of the protective outer cover on a hose?
To shield the hose from physical damage
Why is an outer cover often designed as an integral fire-sleeve in high heat areas?
To provide extra protection to the hose
What information is typically displayed on the outer cover of aircraft flexible hoses?
MIL-SPEC number, manufacturer’s name, and dash number
How does the lay line on the outer cover help identify a twisted hose during installation?
The lay line runs straight with no twists when properly installed
Why is it important for an aircraft flexible hose to have its lay line marked clearly?
To identify if the hose is twisted during installation
What should be done with fittings that show signs of damage?
Reject them immediately
What type of fittings have sockets, nipples, and nuts for potential reuse?
Reusable fittings
Why is it advised not to mix components manufactured by different companies?
To ensure the system's integrity
What should be used to cover open ends of disconnected aircraft fluid lines and fittings?
Blanks
What is a key reason for carefully inspecting reusable fittings before reuse?
To detect damage or defects
What does the presence of cracking on the nut indicate about a reusable fitting?
It must be replaced immediately
What type of rubber is used for the inner liner of a high-pressure hose designed to carry Skydrol?
Synthetic Butyl rubber
How is high-pressure hose distinguished from medium-pressure hose?
By the color of the outer braid
What distinguishes a hose designed to carry Skydrol from other high-pressure hoses?
Green outer cover with white lay line
What kind of fittings are hoses using swaged-end fittings assembled with?
Special machinery
Why can fittings with swaged-end fittings not be removed and reused?
They are permanently attached during assembly
How are flexible hose fittings typically classified?
By the attachment method and pressure capacity
Test your knowledge on banjo fittings, which are commonly used in engine and airframe fluid systems, and the use of O-rings instead of aluminum gaskets. Learn about the stress-free alignment of fluid lines to components through rotating banjos before torqueing bolts. This quiz is based on materials and hardware covered in CASA Part 66 training materials.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
