PRACTICAS STANDARD

Magnetic particle inspection is used primarily to detect. distortion. deep subsurface flaws. flaws on or near the surface.

Liquid penetrant inspection methods may be used on which of the following? 1. porous plastics. 2. ferrous metals. 3. nonferrous metals. 4. smooth primer-sealed wood. 5. nonporous plastics. 2, 3, 4. 1, 2, 3. 2, 3, 5.

Which of these nondestructive testing methods is suitable for the inspection of most metals, plastics, and ceramics for surface and subsurface defects?. Eddy current inspection. Magnetic particle inspection. Ultrasonic inspection.

Which of the following defects are not acceptable for metal lines? 1. Cracked flare 2. Seams 3. Dents in the heel of a bend less than 20% of the diameter 4. Scratches/nicks on the inside of a bend less than 10% of wall thickness 5. Dents in straight section that are 20% of tube diameter. 1, 2, 3, 4, and 5. 1, 2, and 3. 1, 2, 3, and 5.

What nondestructive testing method requires little or no part preparation, is used to detect surface or near-surface defects in most metals, and may also be used to separate metals or alloys and their heat-treat conditions?. Eddy current inspection. Ultrasonic inspection. Magnetic particle inspection.

What method of magnetic particle inspection is used most often to inspect aircraft parts for invisible cracks and other defects?. Residual. Inductance. Continuous.

How many of these factors are considered essential knowledge for x-ray exposure? 1. Processing of the film. 2. Material thickness and density. 3. Exposure distance and angle. 4. Film characteristics. One. Three. Four.

The testing medium that is generally used in magnetic particle inspection utilizes a ferromagnetic material that has. high permeability and low retentivity. low permeability and high retentivity. high permeability and high retentivity.

Which statement relating to the residual magnetizing inspection method is true?. Subsurface discontinuities are made readily apparent. It is used in practically all circular and longitudinal magnetizing procedures. It may be used with steels which have been heat treated for stressed applications.

A mechanic has completed a bonded honeycomb repair using the potted compound repair technique. What nondestructive testing method is used to determine the soundness of the repair after the repair has cured?. Eddy current test. Metallic ring test. Ultrasonic test.

What two types of indicating mediums are available for magnetic particle inspection?. Iron and ferric oxides. Wet and dry process materials. High retentivity and low permeability material.

Which of the following materials may be inspected using the magnetic particle inspection method? 1. Magnesium alloys. 2. Aluminum alloys. 3. Iron alloys. 4. Copper alloys. 5. Zinc alloys. 1, 2, 3. 1, 2, 4, 5. 3.

One way a part may be demagnetized after magnetic particle inspection is by. subjecting the part to high voltage, low amperage ac. slowly moving the part out of an ac magnetic field of sufficient strength. slowly moving the part into an ac magnetic field of sufficient strength.

Which type crack can be detected by magnetic particle inspection using either circular or longitudinal magnetization?. 45°. Longitudinal. Transverse.

Which of the following methods may be suitable to use to detect cracks open to the surface in aluminum forgings and castings? 1. Dye penetrant inspection. 2. Magnetic particle inspection. 3. Metallic ring (coin tap) inspection. 4. Eddy current inspection. 5. Ultrasonic inspection. 6. Visual inspection. 1, 4, 5, 6. 1, 2, 4, 5, 6. 1, 2, 3, 4, 5, 6.

To detect a minute crack using dye penetrant inspection usually requires. that the developer be applied to a flat surface. a longer-than-normal penetrating time. the surface to be highly polished.

Which of the following is a main determinant of the dwell time to use when conducting a dye or fluorescent penetrant inspection?. The size and shape of the discontinuities being looked for. The size and shape of the part being inspected. The type and/or density of the part material.

When checking an item with the magnetic particle inspection method, circular and longitudinal magnetization should be used to. reveal all possible defects. evenly magnetize the entire part. ensure uniform current flow.

In magnetic particle inspection, a flaw that is perpendicular to the magnetic field flux lines generally causes. a large disruption in the magnetic field. a minimal disruption in the magnetic field. no disruption in the magnetic field.

If dye penetrant inspection indications are not sharp and clear, the most probable cause is that the part. was not correctly degaussed before the developer was applied. has no appreciable damage. was not thoroughly washed before the developer was applied.

(1) An aircraft part may be demagnetized by subjecting it to a magnetizing force from alternating current that is gradually reduced in strength. (2) An aircraft part may be demagnetized by subjecting it to a magnetizing force from direct current that is alternately reversed in direction and gradually reduced in strength. Regarding the above statements,. both No. 1 and No. 2 are true. only No. 1 is true. only No. 2 is true.

The pattern for an inclusion is a magnetic particle buildup forming. a fernlike pattern. a single line. parallel lines.

A part which is being prepared for dye penetrant inspection should be cleaned with. a volatile petroleum-base solvent. the penetrant developer. water-base solvents only.

Under magnetic particle inspection, a part will be identified as having a fatigue crack under which condition?. The discontinuity pattern is straight. The discontinuity is found in a nonstressed area of the part. The discontinuity is found in a highly stressed area of the part.

In performing a dye penetrant inspection, the developer. seeps into a surface crack to indicate the presence of a defect. acts as a blotter to produce a visible indication. thoroughly cleans the surface prior to inspection.

What defects will be detected by magnetizing a part using continuous longitudinal magnetization with a cable?. Defects perpendicular to the long axis of the part. Defects parallel to the long axis of the part. Defects parallel to the concentric circles of magnetic force within the part.

Circular magnetization of a part can be used to detect which defects?. Defects parallel to the long axis of the part. Defects perpendicular to the long axis of the part. Defects perpendicular to the concentric circles of magnetic force within the part.

(1) In nondestructive testing, a discontinuity may be defined as an interruption in the normal physical structure or configuration of a part. (2) A discontinuity may or may not affect the usefulness of a part. Regarding the above statements,. only No. 1 is true. only No. 2 is true. both No. 1 and No. 2 are true.

What type of corrosion may attack the grain boundaries of aluminum alloys when the heat treatment process has been improperly accomplished?. Concentration cell. Intergranular. Fretting.

Which of the following describe the effects of annealing steel and aluminum alloys? 1. decrease in internal stress. 2. softening of the metal. 3. improved corrosion resistance. 1, 2. 1, 3. 2, 3.

Which heat-treating process of metal produces a hard, wear-resistant surface over a strong, tough core?. Case hardening. Annealing. Tempering.

Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?. Tempering. Normalizing. Case hardening.

Normalizing is a process of heat treating. aluminum alloys only. iron-base metals only. both aluminum alloys and iron-base metals.

Which of the following occurs when a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending? 1. The metals become artifically aged. 2. The metals become stress corrosion cracked. 3. The metals become cold worked, strain or work hardened. 2. 1 and 3. 3.

The reheating of a heat treated metal, such as with a welding torch. has little or no effect on a metal's heat treated characteristics. has a cumulative enhancement effect on the original heat treatment. can significantly alter a metal's properties in the reheated area.

Why is steel tempered after being hardened?. To increase its hardness and ductility. To increase its strength and decrease its internal stresses. To relieve its internal stresses and reduce its brittleness.

What aluminum alloy designations indicate that the metal has received no hardening or tempering treatment?. 3003-F. 5052-H36. 6061-O.

Which material cannot be heat treated repeatedly without harmful effects?. Unclad aluminum alloy in sheet form. 6061-T9 stainless steel. Clad aluminum alloy.

What is descriptive of the annealing process of steel during and after it has been annealed?. Rapid cooling; high strength. Slow cooling; low strength. Slow cooling; increased resistance to wear.

Unless otherwise specified, torque values for tightening aircraft nuts and bolts relate to. clean, dry threads. clean, lightly oiled threads. both dry and lightly oiled threads.

What is generally used in the construction of aircraft engine firewalls?. Stainless steel. Chrome-molybdenum alloy steel. Titanium nickel alloy.

Unless otherwise specified or required, aircraft bolts should be installed so that the bolthead is. upward, or in rearward direction. upward, or in a forward direction. downward, or in a forward direction.

Alclad is a metal consisting of. aluminum alloy surface layers and a pure aluminum core. pure aluminum surface layers on an aluminum alloy core. a homogeneous mixture of pure aluminum and aluminum alloy.

A fiber-type, self-locking nut must never be used on an aircraft if the bolt is. under shear loading. under tension loading. subject to rotation.

The Society of Automotive Engineers (SAE) and the American Iron and Steel Institute use a numerical index system to identify the composition of various steels. In the number '4130' designating chromium molybdenum steel, the first digit indicates the. percentage of the basic element in the alloy. percentage of carbon in the alloy in hundredths of a percent. basic alloying element.

(Refer to Figure 42.) Which of the bolthead code markings shown identifies an AN corrosion resistant steel bolt?. 1. 2. 3.

Aircraft bolts with a cross or asterisk marked on the bolthead are. made of aluminum alloy. close tolerance bolts. standard steel bolts.

Which statement regarding aircraft bolts is correct?. When tightening castellated nuts on drilled bolts, if the cotter pin holes do not line up, it is permissible to overtighten the nut to permit alignment of the next slot with the cotter pin hole. In general, bolt grip lengths should equal the material thickness. Alloy steel bolts smaller than 1/4-inch diameter should not be used in primary structure.

Generally speaking, bolt grip lengths should be. equal to the thickness of the material which is fastened together, plus approximately one diameter. equal to the thickness of the material which is fastened together. one and one half times the thickness of the material which is fastened together.

When the specific torque value for nuts is not given, where can the recommended torque value be found?. AC 43.13-1B. Technical Standard Order. AC 43.13-2A.

(Refer to Figure 43.) Identify the clevis bolt illustrated. 1. 3. 2.

A particular component is attached to the aircraft structure by the use of an aircraft bolt and a castle tension nut combination. If the cotter pin hole does not align within the recommended torque range, the acceptable practice is to. exceed the recommended torque range by no more than 10 percent. tighten below the torque range. change washers and try again.

A bolt with a single raised dash on the head is classified as an. AN corrosion-resistant steel bolt. NAS standard aircraft bolt. NAS close tolerance bolt.

How is a clevis bolt used with a fork-end cable terminal secured?. With a shear nut tightened to a snug fit, but with no strain imposed on the fork and safetied with a cotter pin. With a castle nut tightened until slight binding occurs between the fork and the fitting to which it is being attached. With a shear nut and cotter pin or a thin self-locking nut tightened enough to prevent rotation of the bolt in the fork.

Where is an AN clevis bolt used in an airplane?. For tension and shear load conditions. Where external tension loads are applied. Only for shear load applications.

A bolt with an X inside a triangle on the head is classified as an. NAS standard aircraft bolt. NAS close tolerance bolt. AN corrosion-resistant steel bolt.

The core material of Alclad 2024-T4 is. heat-treated aluminum alloy, and the surface material is commercially pure aluminum. commercially pure aluminum, and the surface material is heat-treated aluminum alloy. strain-hardened aluminum alloy, and the surface material is commercially pure aluminum.

The aluminum code number 1100 identifies what type of aluminum?. Aluminum alloy containing 11 percent copper. Aluminum alloy containing zinc. 99 percent commercially pure aluminum.

Aircraft bolts are usually manufactured with a. class 1 fit for the threads. class 2 fit for the threads. class 3 fit for the threads.

In the four-digit aluminum index system number 2024, the first digit indicates. the major alloying element. the number of major alloying elements used in the metal. the percent of alloying metal added.

How is the locking feature of the fiber-type locknut obtained?. By the use of an unthreaded fiber locking insert. By a fiber insert held firmly in place at the base of the load carrying section. By making the threads in the fiber insert slightly smaller than those in the load carrying section.

Why should an aircraft maintenance technician be familiar with weld nomenclature?. So that accurate visual (pictorial) comparisons can be made. In order to gain familiarity with the welding technique, filler material, and temperature range used. In order to compare welds with written (non-pictorial) description standards.

(Refer to Figure 44.) Identify the weld caused by an excessive amount of acetylene. 4. 1. 3.

(Refer to Figure 44.) Select the illustration which depicts a cold weld. 3. 2. 4.

Why is it considered good practice to normalize a part after welding?. To relieve internal stresses developed within the base metal. To increase the hardness of the weld. To remove the surface scale formed during welding.

Holes and a few projecting globules are found in a weld. What action should be taken?. Reweld the defective portions. Remove all the old weld, and reweld the joint. Grind the rough surface smooth, inspect, and reweld all gaps/holes.

Which condition indicates a part has cooled too quickly after being welded?. Cracking adjacent to the weld. Discoloration of the base metal. Gas pockets, porosity, and slag inclusions.

Select a characteristic of a good gas weld. The depth of penetration shall be sufficient to ensure fusion of the filler rod. The height of the weld bead should be 1/8 inch above the base metal. The weld should taper off smoothly into the base metal.

One characteristic of a good weld is that no oxide should be formed on the base metal at a distance from the weld of more than. 1/2 inch. 1 inch. 1/4 inch.

In examining and evaluating a welded joint, a mechanic should be familiar with. likely ambient exposure conditions and intended use of the part, along with type of weld and original part material composition. the welding technique, filler material, and temperature range used. the parts, proportions, and formation of a weld.

(Refer to Figure 45.) What type weld is shown at A?. Fillet. Butt. Lap.

(Refer to Figure 45.) What type weld is shown at B?. Butt. Double butt. Fillet.

(Refer to Figure 45.) What type weld is shown at G?. Lap. Butt. Joint.

On a fillet weld, the penetration requirement includes what percentage(s) of the base metal thickness?. 100 percent. 25 to 50 percent. 60 to 80 percent.

Which tool can be used to measure the alignment of a rotor shaft or the plane of rotation of a disk?. Dial indicator. Shaft gauge. Protractor.

(Refer to Figure 46.) The measurement reading on the illustrated micrometer is. 0.2851. 0.2911. 0.2901.

Identify the correct statement. An outside micrometer is limited to measuring diameters. Tools used on certificated aircraft must be an approved type. Dividers do not provide a reading when used as a measuring device.

(Refer to Figure 47.) What is the measurement reading on the vernier caliper scale?. 1.411 inches. 1.436 inches. 1.700 inches.

Which tool is used to measure the clearance between a surface plate and a relatively narrow surface being checked for flatness?. Depth gauge. Thickness gauge. Dial indicator.

Which number represents the vernier scale graduation of a micrometer?. .00001. .001. .0001.

Which tool is used to find the center of a shaft or other cylindrical work?. Combination set. Dial indicator. Micrometer caliper.

(Refer to Figure 48.) What does the micrometer read?. .2974. .3004. .3108.

If it is necessary to accurately measure the diameter of a hole approximately 1/4 inch in diameter, the mechanic should use a. telescoping gauge and determine the size of the hole by taking a micrometer reading of the adjustable end of the telescoping gauge. 0- to 1-inch inside micrometer and read the measurement directly from the micrometer. small-hole gauge and determine the size of the hole by taking a micrometer reading of the ball end of the gauge.

(Refer to Figure 49.) The measurement reading on the micrometer is. .2758. .2702. .2792.

What tool is generally used to set a divider to an exact dimension?. Machinist scale. Surface gauge. Dial indicator.

What tool is generally used to calibrate a micrometer or check its accuracy?. Gauge block. Dial indicator. Machinist scale.

What precision measuring tool is used for measuring crankpin and main bearing journals for out-of-round wear?. Dial gauge. Micrometer caliper. Depth gauge.

The side clearances of piston rings are measured with a. micrometer caliper gauge. thickness gauge. dial gauge.

How can the dimensional inspection of a bearing in a rocker arm be accomplished?. Depth gauge and micrometer. Thickness gauge and push-fit arbor. Telescopic gauge and micrometer.

The twist of a connecting rod is checked by installing push-fit arbors in both ends, supported by parallel steel bars on a surface plate. Measurements are taken between the arbor and the parallel bar with a. dial gauge. height gauge. thickness gauge.

The clearance between the piston rings and the ring lands is measured with a. micrometer caliper. thickness gauge. depth gauge.

What may be used to check the stem on a poppet-type valve for stretch?. Dial indicator. Micrometer. Telescoping gauge.

Which tool can be used to determine piston pin out-of-round wear?. Telescopic gauge. Micrometer caliper. Dial indicator.

A primary reason why ordinary or otherwise nonapproved cleaning compounds should not be used when washing aircraft is because their use can result in. hydrogen embrittlement in metal structures. hydrogen embrittlement in nonmetallic materials. a general inability to remove compound residues.

How may magnesium engine parts be cleaned?. Soak in a 20 percent caustic soda solution. Spray with MEK (methyl ethyl ketone). Wash with a commercial solvent, decarbonize, and scrape or grit blast.

When an anodized surface coating is damaged in service, it can be partially restored by. applying a thin coat of zinc chromate primer. chemical surface treatment. use of a suitable mild cleaner.

For which of the following reasons would a water break test be conducted?. To make certain that a newly alodized aluminum surface is sufficiently coated. To make certain that a bare metal surface is thoroughly clean. To make certain that an anodizing coating has been sufficiently removed before an electrical bonding connection can be made.

Select the solvent recommended for wipedown of cleaned surfaces just before painting. Aliphatic naptha. Dry-cleaning solvent. Aromatic naptha.

Nickel-cadmium battery cases and drain surfaces which have been affected by electrolyte should be neutralized with a solution of. boric acid. sodium bicarbonate. potassium hydroxide.

Which of the following are acceptable to use when utilizing chemical cleaning agents on aircraft? 1. Synthetic fiber wiping cloths when using a flammable agent. 2. Cotton fiber wiping cloths when using a flammable agent. 3. Atomizing spray equipment. 2 and 3. 1. 2.

Select the solvent used to clean acrylics and rubber. Aliphatic naphtha. Methyl ethyl ketone. Aromatic naphtha.

Fayed surfaces cause concern in chemical cleaning because of the danger of. forming passive oxides. entrapping corrosive materials. corrosion by imbedded iron oxide.

Caustic cleaning products used on aluminum structures have the effect of producing. passive oxidation. improved corrosion resistance. corrosion.

Fretting corrosion is most likely to occur. when two surfaces fit tightly together but can move relative to one another. only when two dissimilar metals are in contact. when two surfaces fit loosely together and can move relative to one another.

The rust or corrosion that occurs with most metals is the result of. a tendency for them to return to their natural state. blocking the flow of electrons in homogenous metals, or between dissimilar metals. electron flow in or between metals from cathodic to anodic areas.

Which of the following are the desired effects of using Alodine on aluminum alloy? 1. A slightly rough surface. 2. Relieved surface stresses. 3. A smooth painting surface. 4. Increased corrosion resistance. 3 and 4. 1, 2, and 4. 1 and 4.

Which of the listed conditions is NOT one of the requirements for corrosion to occur?. The presence of an electrolyte. Electrical contact between an anodic area and a cathodic area. The presence of a passive oxide film.

The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion residual product buildup is called. brinelling. granulation. exfoliation.

A nonelectrolytic chemical treatment for aluminum alloys to increase corrosion resistance and paint-bonding qualities is called. anodizing. alodizing. dichromating.

Which of the following are acceptable to use in cleaning anodized surfaces? 1. Steel wool. 2. Brass wire brush. 3. Aluminum wool. 4. Stainless steel wire brush. 5. Fiber bristle brush. 1, 3, & 5. 2 & 4. 3 & 5.

Intergranular corrosion in aluminum alloy parts. may be detected by surface pitting, and white, powdery deposit formed on the surface of the metal. commonly appears as threadlike filaments of corrosion products under a dense film of paint. cannot always be detected by surface indications.

Which of the following may not be detectable even by careful visual inspection of the surface of aluminum alloy parts or structures?. Filiform corrosion. Intergranular corrosion. Uniform etch corrosion.

What may be used to remove corrosion from highly stressed steel surfaces?. Steel wire brushes. Fine-grit aluminum oxide. Medium-grit carborundum paper.

A primary cause of intergranular corrosion is. improper heat treatment. dissimilar metal contact. improper application of primer.

Corrosion should be removed from magnesium parts with a. stiff, nonmetallic brush. silicon carbide brush. carborundum abrasive.

Why is it important not to rotate the crankshaft after the corrosion preventive mixture has been put into the cylinders on engines prepared for storage?. Fuel may be drawn into one or more cylinders and dilute or wash off the corrosion preventive mixture. The seal of corrosion preventive mixture will be broken. Engine damage can occur from hydraulic lock.

Which of the following is an acceptable first step procedure to help prevent scratching when cleaning a transparent plastic surface?. Gently wipe the surface with a clean, dry, soft cloth. Flush the surface with clean water. Gently wipe the surface with a clean, soft cloth moistened with de-mineralized or distilled water.

What should be done to prevent rapid deterioration when oil or grease come in contact with a tire?. Wipe the tire thoroughly with a dry cloth, and then rinse with clean water. Wipe the tire with a dry cloth followed by a washdown and rinse with soap and water. Wipe the tire with a cloth dampened with aromatic naphtha and then wipe dry with a clean cloth.

Galvanic corrosion is likely to be most rapid and severe when. the surface area of the cathodic metal is smaller than surface area of the anodic metal. the surface areas of the anodic and cathodic metals are approximately the same. the surface area of the anodic metal is smaller than the surface area of the cathodic metal.

Corrosion caused by galvanic action is the result of. excessive anodization. contact between two unlike metals. excessive etching.

Which of these materials is the most anodic?. Cadmium. 7075-T6 aluminum alloy. Magnesium.

The interior surface of sealed structural steel tubing would be best protected against corrosion by which of the following?. Charging the tubing with dry nitrogen prior to sealing. Evacuating moisture from the tubing before sealing. A coating of linseed oil.

Which of these materials is the most cathodic?. Zinc. 2024 aluminum alloy. Stainless steel.

Of the following, when and/or where is galvanic corrosion is most likely to occur?. When an electrolyte (water) covers the surface of an aluminum skin, seeps into the cracks between lap joints, and oxygen is excluded from the area. At the interface of a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte. In an area of unprotected metal exposed to an atmosphere containing battery fumes, exhaust gases, or industrial contaminants.

One way of obtaining increased resistance to stress corrosion cracking is by. relieving compressive stresses (via heat treatment) on the metal surface. creating compressive stresses (via shot peening) on the metal surface. producing nonuniform deformation while cold working during the manufacturing process.

(1) In the corrosion process, it is the cathodic area or dissimilar cathodic material that corrodes. (2) In the Galvanic or Electro-Chemical Series for metals, the most anodic metals are those that will give up electrons most easily. Regarding the above statements,. only No. 1 is true. only No. 2 is true. both No. 1 and No. 2 are true.

Which coupling nut should be selected for use with 1/2-inch aluminum oil lines which are to be assembled using flared tube ends and standard AN nuts, sleeves, and fittings?. AN-818-5. AN-818-16. AN-818-8.

Metal tubing fluid lines are sized by wall thickness and. outside diameter in 1/16 inch increments. inside diameter in 1/16 inch increments. outside diameter in 1/32 inch increments.

From the following sequences of steps, indicate the proper order you would use to make a single flare on a piece of tubing: 1. Place the tube in the proper size hole in the flaring block. 2. Project the end of the tube slightly from the top of the flaring tool, about the thickness of a dime. 3. Slip the fitting nut and sleeve on the tube. 4. Strike the plunger several light blows with a lightweight hammer or mallet and turn the plunger one-half turn after each blow. 5. Tighten the clamp bar securely to prevent slippage. 6. Center the plunger or flaring pin over the tube. 1, 3, 5, 2, 4, 6. 3, 1, 6, 2, 5, 4. 3, 1, 2, 6, 5, 4.

Hydraulic tubing, which is damaged in a localized area to such an extent that repair is necessary, may be repaired. by cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends. only by replacing the tubing section run (connection to connection) using the same size and material as the original. by cutting out the damaged section and soldering in a replacement section of tubing.

What is an advantage of a double flare on aluminum tubing?. Ease of construction. More resistant to damage when the joint is tightened. Can be applied to any size and wall-thickness of tubing.

A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it. expands in length and diameter. expands in length and contracts in diameter. contracts in length and expands in diameter.

The term 'cold flow' is generally associated with. the effects of low temperature gasses or liquids flowing in hose or tubing. impressions left in natural or synthetic rubber hose material. flexibility characteristics of various hose materials at low ambient temperatures.

What is the color of an AN steel flared-tube fitting?. Black. Blue. Red.

Which of the following statements is/are correct in reference to flare fittings? 1. AN fittings have an identifying shoulder between the end of the threads and the flare cone. 2. AC and AN fittings are considered identical except for material composition and identifying colors. 3. AN fittings are generally interchangeable with AC fittings of compatible material composition. A- 1. 1 and 3. 1, 2, and 3.

Flexible lines must be installed with. a slack of 5 to 8 percent of the length. a slack of at least 10 to 12 percent of the length. enough slack to allow maximum flexing during operation.

The maximum distance between end fittings to which a straight hose assembly is to be connected is 50 inches. The minimum hose length to make such a connection should be. 54-1/2 inches. 51-1/2 inches. 52-1/2 inches.

Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by. using short, straight sections of tubing between fixed parts of the aircraft. using tubing of the same material as the majority of the adjoining structure. providing bends in the tubing.

The material specifications for a certain aircraft require that a replacement oil line be fabricated from 3/4-inch 0.072 5052-0 aluminum alloy tubing. What is the inside dimension of this tubing?. 0.606 inch. 0.688 inch. 0.750 inch.

In most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut are used when a tubing flare is required. The use of this type connector eliminates. the flaring operation prior to assembly. the possibility of reducing the flare thickness by wiping or ironing during the tightening process. wrench damage to the tubing during the tightening process.

Which statement(s) about Military Standard (MS) flareless fittings is/are correct? 1. During installation, MS flareless fittings are normally tightened by turning the nut a specified amount, rather than being torqued. 2. New MS flareless tubing/fittings should be assembled clean and dry without lubrication. 3. During installation, MS flareless fittings are normally tightened by applying a specified torque to the nut. 1. 1 and 2. 3.

When flaring aluminum tubing for use with AN fittings, the flare angle must be. 37°. 39°. 45°.

Scratches or nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than. 20 percent of the wall thickness. 1/32 inch or 20 percent of wall thickness, whichever is less. 10 percent of the wall thickness.

Flexible hose used in aircraft systems is classified in size according to the. outside diameter. wall thickness. inside diameter.

A scratch or nick in aluminum tubing can be repaired provided it does not. appear in the heel of a bend. appear on the inside of a bend. exceed 10 percent of the tube OD on a straight section.

Which of the following hose materials are compatible with phosphate-ester base hydraulic fluids? 1. Butyl. 2. Teflon. 3. Buna-N. 4. Neoprene. 1 and 2. 2 and 4. 1 and 3.

Which tubings have the characteristics (high strength, abrasion resistance) necessary for use in a high-pressure (3,000 PSI) hydraulic system for operation of landing gear and flaps?. 2024-T or 5052-0 aluminum alloy. Corrosion-resistant steel annealed or 1/4H. 1100-1/2H or 3003-1/2H aluminum alloy.

When installing bonded clamps to support metal tubing,. paint removal from tube is not recommended as it will inhibit corrosion. paint clamp and tube after clamp installation to prevent corrosion. remove paint or anodizing from tube at clamp location.

In a metal tubing installation,. rigid straight line runs are preferable. tension is undesirable because pressurization will cause it to expand and shift. a tube may be pulled in line if the nut will start on the threaded coupling.

The best tool to use when cutting aluminum tubing, or any tubing of moderately soft metal is a. hand operated wheel-type tubing cutter. fine-tooth hacksaw. circular-saw equipped with an abrasive cutting wheel.

The primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs is to. clear obstacles and make turns in aircraft structures. provide for access within aircraft structures. prevent excessive stress on the tubing.

Which of the following statements is true regarding minimum allowable bend radii for 1.5 inches OD or less aluminum alloy and steel tubing of the same size?. The minimum radius for steel is greater than for aluminum. The minimum radius for steel is less than for aluminum. The minimum radius is the same for both steel and aluminum.

A gas or fluid line marked with the letters PHDAN is. a dual-purpose pneumatic and/or hydraulic line for normal and emergency system use. used to carry a hazardous substance. a pneumatic or hydraulic system drain or discharge line.

Which statement is true regarding the variety of symbols utilized on the identifying color-code bands that are currently used on aircraft plumbing lines?. Symbols are composed of various single colors according to line content. Symbols are always black against a white background regardless of line content. Symbols are composed of one to three contrasting colors according to line content.

If a flared tube coupling nut is overtightened, where is the tube most likely to be weakened/damaged?. Along the entire length of the sleeve and tube interface. At the edge of the sleeve and straight portion of the tube. At the sleeve and flare junction.

Which statement concerning Bernoulli's principle is true?. The pressure of a fluid increases at points where the velocity of the fluid increases. The pressure of a fluid decreases at points where the velocity of the fluid increases. It applies only to gases and vaporized liquids.

(1) Bonded clamps are used for support when installing metal tubing. (2) Unbonded clamps are used for support when installing wiring. Regarding the above statements,. only No. 1 is true. both No. 1 and No. 2 are true. neither No. 1 nor No. 2 is true.

Which statement is true regarding flattening of tubing in bends?. Flattening by a maximum of 20 percent of the original diameter is permissible. Flattening by not more than 25 percent of the original diameter is permissible. The small diameter portion in the bend cannot exceed more than 75 percent of the diameter of straight tubing.

A 3/8 inch aircraft high pressure flexible hose as compared to 3/8 inch metal tubing used in the same system will. have higher flow capabilities. have equivalent flow characteristics. usually have interchangeable applications.