hydraulics midterm asoudiasondp

Used in stationary installations and where long, relatively straight runs are possible.

Rigid Fluid Lines

Used where lines must connect stationary parts to moving components, or in areas subject to high operational vibration.

Flexible Fluid Lines

TYPES OF FLUID LINES (2):

1. rigid fluid lines

2. flexible fluid lines

For low pressure/instruments, for medium-pressure fuel, oil, and hydraulic lines up to 1,500 psi.

Aluminum Alloys

Used in high-pressure systems (3,000 psi or more) like landing gear, brakes, and fire zones due to high tensile strength and abrasion resistance.

Corrosion-Resistant Steel

Used in high-performance transport aircraft for high pressure, oxygen systems. Safety note: must never be used in oxygen systems due to spontaneous combustion risks.

Titanium

Historically used, but obsolete because vibration makes it brittle and prone to cracking.

Copper

Metal tubing is sized by _______, which is measured fractionally in ______ of an inch.

outside diameter
sixteenths

Before making repairs to any aircraft tubing, it is important to make accurate ______ of tubing materials.

identification

Printed code markings show a _____ , not more than 4’’ in width, painted at the two ends and approximately midway between the ends of some tubing.

color code

It is important to produce a _____ end, free of ____.

square
burrs

A new piece of tubing should be cut approximately _____ percent longer than the tube to be replaced to provide for minor variations in bending

10

If tube cutter is not available, or if tubing of hard material is to be cut, use a fine-tooth hacksaw, preferably one having ____ teeth per inch.

32

To obtain a smooth bend without flattening the tube, it is usually done with either a ______ bender or a _____ bender.

hand tube
mechanically operated

Consists of a handle, a radius block, a clip, and a slide bar used as levers to provide mechanical advantage necessary to bend the tubing.

Hand Tube Bender

Considered the most practical and most accurate method of bending copper tube.

MECHANICAL TUBE BENDERS

Bends may be made up to 180* without buckling or kinking the tubing.

mechanical tube benders

2 kinds of flares

1. single flare

2. double flare

are frequently subjected to extremely high pressures

flares

is the result of tubing not being cut squarely

crooked flare

2 Basic Types of Hose (Military Aircraft & Related Equipment)

1. Synthetic rubber

2. teflon

Rubber Hose consists of a minimum of ____ layers

3

designed to withstand the attack of the fluid that passes through it.

inner tube

Hoses are provided in three pressure ranges:

1. low

2. medium

3. high

Flexible hose must not be _____ during installation

twisted

A flexible hose must never be ______ tightly between two fittings.
About ___ to ____percent of the total length must be allowed as slack to provide freedom of movement under pressure.

stretched

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