Aircraft Tubing, Hose Systems, and Testing Methods

Vocabulary flashcards generated from quizzes covering aircraft rigid tubing, flaring tools, standard fitting specifications, flexible hose structures, clamps, and tubing identification tests.

Acid test

A test that attacks alloys at different rates and yields different colors in the corrosion product to differentiate tubing.

Annealing

A heat treatment process where a material is heated and slowly cooled.

Brittleness

A material condition accomplished by heating the tube until it is red hot and then cooling it in cold water.

Brinell test

A type of hardness test that uses a $10\text{-millimeter}$ ball.

Corrosion resistant steel tubing

Tubing used on parts physically damaged due to debris, chosen for its higher tensile strength which permits thinner walls.

Stamping

The identification method used to identify large aluminum alloy tubes.

Rockwell test

A kind of hardness test that measures depth instead of the dent's diameter.

Titanium tube

A type of aircraft tubing used alongside cryofit fittings and swaged fittings.

Color band

A visual marker used to identify small rigid tubing.

Hardness tests for tubing

The three types of hardness tests used for tubing: Rockwell, Brinell, and Barcol.

Tubing differentiation tests

The three types of tests conducted to differentiate various kinds of tubing: nitric acid test, magnet test, and hardness test.

Modern aircraft tubing materials

The three types of tubes used in modern aircraft: aluminum, titanium, and corrosion resistant steel (CRS).

Flaring tool components

The three specific tools comprising a flaring tool set: center yoke, hole bar/hole block, and flaring adapter.

Standard fitting specifications

The three types of standard fitting specifications: AN, MS, and Aircorps.

Rigid line joining methods

The four methods used to join rigid lines: single flaring, flareless, beading, and double flaring.

Aircorps

Standard specifications for fittings that were used prior to World War II.

Beading

A tubing operation done with larger diameter lines carrying low-pressure fluids such as engine return oil and cooling air.

Presetting

A process of applying enough pressure to a sleeve to cause it to cut into the outside of the tube.

Beading tool

A tool that creates a ridge before the end of the tube, compatible with aluminum, copper, steel, and stainless steel tubing.

Bulkhead fitting

A specific tube fitting designed to allow a line to run through a specific partition or bulkhead location.

Flareless fitting

A fitting designed to provide leak-free attachments without flares, used with heavy wall tubing in high-pressure systems where flaring is difficult.

Double flare

A type of tube flare that is more durable and resistant to the shearing effect of torque than a single flare.

Single flare

A flare formed with either an impact-type flaring tool or one having a flaring cone with a rolling action.

Tube flaring

A process where a funnel shape is created at the end of a tube to match the dimensions of a mating fitting to form a tight seal.

Low pressure hose

A flexible hose with a seamless inner liner, reinforcement made of a single layer of cotton braid, and an outer cover of ribbed or smooth rubber.

Flexible hose pressure ratings

The three pressure classifications handled by flexible hoses: low, medium, and high.

Reusable fitting components

The three parts that comprise a reusable fitting for a flexible hose: socket, nut, and nipple.

High pressure hose

A hose type used for pressures of at least $3{,}000\text{ psi}$ that utilizes a synthetic rubber liner to carry petroleum products.

Inner liner

The part of a flexible hose that carries fluid, requiring minimum porosity and full chemical compatibility with the fluid.

Aluminum tubing scratch tolerance

The maximum allowed depth tolerance for a scratch or nick on aluminum alloy tubing, which is $10\%$.

Plain clamp

A clamp consisting of a circular metal band used in areas not subject to vibration.

Tube bend

A bend formed in rigid tubing required to help absorb stress caused by vibration.

Reinforcement layer

The middle layer of a rubber hose made from layers of cotton, rayon, or polyester fabric.

Teflon inner liner

An inner layer type with an operating temperature range of $-65\,^{\circ}\text{F}$ to $+450\,^{\circ}\text{F}$ that is compatible with nearly every liquid used.

Rubber cushioned clamp

A clamp that secures lines subject to vibration, reduces vibration transmission to the line, and prevents chafing.

Neoprene inner liner

An inner liner made of synthetic rubber that is abrasion-resistant and used with petroleum-based fluids.