FAA ORAL QUESTIONS - FLUID LINES & FITTINGS Flashcards
(20 cards)
8192
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?
A. AN-818-5
B. AN-818-16
C. AN-818-8
C
An AN-818-5 nut will fit a 5/16-inch tube. (The last dash number is the tube diameter in 1/16-inch increments.) An AN-818-16 nut will fit a 1-inch tube. An AN-818-8 nut will fit a 1/2-inch tube.
(AM.I.D.K1) - FAA-H-8083-30
8193
Metal tubing fluid lines are sized by wall thickness and
A. outside diameter in 1/16 inch increments.
B. inside diameter in 1/16 inch increments.
C. outside diameter in 1/32 inch increments.
A
Metal tubing used in aircraft fluid power installations is sized by its outside diameter, which is measured fractionally in sixteenths of an inch.
(AM.I.D.K1)- FAA-H-8083-30
8193-1
Rolling-type flaring tools are used to flare ___ _, ___ _, and _____ tubing.
A. Stainless steel, hard copper, mild steel.
B. Titanium, soft copper, corrosion resistant steel.
C. Soft copper, aluminum, brass.
C
Use rolling-type flaring tools only to flare soft copper, aluminum, and brass tubing. Do not use with corrosion resistant steel or titanium.
(AM.I.D.K1) - FAA-H-8083-30
8194
From the following sequences of steps, indicate the proper order you would use to make a single flare on a piece of tubing:
- Place the tube in the proper size hole in the flaring block.
- Project the end of the tube slightly from the top of the flaring tool, about the thickness of a dime.
- Slip the fitting nut and sleeve on the tube.
- Strike the plunger several light blows with a lightweight hammer or mallet and turn the plunger one-half turn after each blow.
- Tighten the clamp bar securely to prevent slippage.
- Center the plunger or flaring pin over the tube.
A-1, 3, 5, 2, 4, and 6.
B-3, 1, 6, 2, 5, and 4.
C-3, 1, 2, 6, 5, and 4.
B
The correct sequence for making a single flare on a piece
of tubing is:
(3) Slip the fitting nut and sleeve on the tube.
(1) Place the tube in the proper size hole in the flaring
block.
(6) Center the plunger or flaring pin over the tube.
(2) Project the end of the tube slightly from the tip of the
flaring tool, about the thickness of a dime.
(5) Tighten the clamp bar securely to prevent slippage.
(4) Strike the plunger several light blows with a lightweight
hammer or mallet. Turn the plunger one-half turn after
each blow.
(AM.I.D.K1) - FAA-H-8083-30
8195
Hydraulic tubing, which is damaged in a localized area to such an extent that repair is necessary, may be repaired
A. by cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends.
B. only by replacing the tubing section run (connection to connection) using the same size and material as the original.
C. by cutting out the damaged section and soldering in a replacement section of tubing.
A
If a piece of high-pressure hydraulic tubing is damaged in a localized area, the damage can be cut out and a new piece of tubing cut to replace the damaged section.
Swage-type splice fittings are slipped over each end of the tubing, and the fittings are swaged to the tube ends.
(AM.I.D.K1) - FAA-H-8083-30
8196
What is an advantage of a double flare on aluminum tubing?
A. Ease of construction.
B. More resistant to damage when the joint is tightened.
C. Can be applied to any size and wall-thickness of tubing.
B
Tubing made of 5052-0 and 6061-T aluminum alloy in sizes from 1/8- to 3/8-inch OD should be flared with a double flare. Double flares are smoother than single flares and are more concentric. Also, the extra metal makes the flare more resistant to the shearing effect when the fittings are torqued.
(AM.I.D.K1) - FAA-H-8083-30
8199
What is the color of an AN steel flared-tube fitting?
A. Black.
B. Blue.
C. Red.
A
Steel AN flared tube fittings are colored black. Aluminum alloyAN fittings are colored blue.
(AM.I.D.K1)-FAA-H - 8083-30
8200
Which of the following statements is/are correct in reference to flare fittings?
- AN fittings have an identifying shoulder between the end of the threads and the flare cone.
- AC and AN fittings are considered identical except for material composition and identifying colors.
- AN fittings are generally interchangeable with AC fittings of compatible material composition
A-1.
B-1 and 3.
C-1, 2, and 3.
A
AN flare fittings have a shoulder between the end of the threads and the flare cone. In AC fittings the threads go all the way to the cone. AN fittings are dyed blue or black and AC fittings are gray or yellow. The threads on an AN fitting are coarser than those on an AC fitting. AN and AC fittings are not interchangeable.
( AM.I.D.K1-) FAA-H-8083-30
8202
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
A-54-1/2 inches.
8-51-1/2 inches.
C-52-1/2 inches.
C
When a flexible line is installed in a fluid power system, it should be between 5 percent and 8 percent longer than the space between the fittings. If the distance between the fittings is 50 inches, the hose should be at least 5% longer than this, or 52-1/2i nches long.
(AM.I.D.K1-) AC 43.13-1B
8204
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?
A. 0.606 inch.
B. 0.688 inch.
C. 0.750 inch.
A
Find the inside diameter of a tube by subtracting two times the wall thickness from its outside diameter.
0.750-2(0.072) = 0.606 inch
The inside diameter is 0.606 inch.
(AM.I.D.K1)- FAAH - 8083~30
8205
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
A. the flaring operation prior to assembly.
B. the possibility of reducing the flare thickness by wiping or ironing during the tightening process.
C. wrench damage to the tubing during the tightening process.
B
There are two types of flare fittings that can be used in aircraft hydraulic systems. One type is the single-piece AN817 nut, and the other is the two-piece MS20819 sleeve and an AN818 nut. The ANB18 nut and sleeve are preferred over the single-piece fitting because it eliminates the possibility of reducing the thickness of the flare by the wiping or ironing action when the nut is tightened. With the two-piece fitting, there is no relative motion between the fitting and the flare when the nut is being tightened.
(AM.I.D.K1)- FAA-H-8083-30
8211
Which of the following hose materials are compatible. with phosphate-ester base hydraulic fluids?
A. Butyl and Teflon.
B. Neoprene and Teflon.
C. Teflon and Buna-N.
A
Butyl is not suitable for use with petroleum products, but is an excellenti nner liner for phosphate-esterb ase hydraulic fluids. Teflon hose is unaffected by any fuel, petroleum, or synthetic-base oils, alcohol, coolants, or solvents commonly used in aircraft. Buna-N should not be used with phosphate-ester base hydraulic fluids. Neoprene is not suitable for use with phosphate-ester base hydraulic fluids.
(AM.I.D.K1)- FAA-H-8083-30
8212
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?
A. 2024-T or 5052-0 aluminum alloy.
B. Corrosion-resistant steel annealed or 1/4H.
C. 1100-1/2H or 3003-1/2H aluminum alloy.
B
Rigid tubing made of corrosion-resistant steel, either annealed or 1/4 hard, is used in high-pressure hydraulic or pneumatic systems where high strength and abrasion resistance are important.
(AM.I.D.K1)- FAA-H-8083-30
8213
When installing bonded clamps to support metal tubing,
A. paint removal from tube is not recommended as it will inhibit corrosion.
B. paint clamp and tube after clamp installation to prevent corrosion.
C. remove paint or anodizing from tube at clamp location.
C
When a piece of metal tubing is installed in a bonded clamp, any paint or anodizing oxide film must be removed from the portion of the tube where the clamp is to fit.
Both paint and the oxide film are electrical insulators.
(AM.J.D.K1-) FAA-H-8083-30
8214
In a metal tubing installation,
A. rigid straight line runs are preferable.
B. tension is undesirable because pressurization will cause it to expand and shift.
C. a tube may be pulled in line if the nut will start on the threaded coupling.
B
When making an installation of rigid metal tubing, each run of the tubing must have at least one bend in it to allow for the shifting of the line as it is pressurized. There must be no tension on the line (the flare in both ends of the tube should rest squarely on the flare cones of the fittings and not have to be pulled into place with the nut).
(AM.I.D.K1) - FAA-H-8083-30
8215
A gas or fluid line marked with the letters PHDAN is
A. a dual-purpose pneumatic and/or hydraulic line for normal and emergency system use.
B. used to carry a hazardous substance.
C. a pneumatic or hydraulic system drain or discharge line.
B
The marking PHDAN on a fluid line indicates that the fluid carried in the line is physically hazardous and dangerous to personnel.
(AM.I.D.K1)- FAA-H-8083-30
8215-1
Which statement is true regarding the variety of symbols utilized on the identifying color-code bands that are currently used on aircraft plumbing lines?
A. Symbols are composed of various single colors according to line content.
B. Symbols are always black against a white background regardless of line content.
C. Symbols are composed of one to three contrasting colors according to line content.
B
The fluid carried in fluid lines in an aircraft is identified by a series of color-coded bands around the line. These bands have from one to three contrasting colors. There is also a white band with black geometric symbols for the benefit of color-blind personnel.
(AM.I.D.K1-) FAA-H-8083-30
8197
A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it
A. expands in length and diameter.
B. expands in length and contracts in diameter.
C. contracts in length and expands in diameter.
C
When flexible hose is installed in an aircraft, it must be given a certain amount of slack because when pressure is applied to the hose, it contracts in length and expands in diameter.
(AM.I.D.K2) - FAA-H-8083-30
8198
The term “cold flow” is generally associated with
A. the effects of low temperature gasses or liquids flowing in hose or tubing.
B. impressions left in natural or synthetic rubber hose material.
C. flexibility characteristics of various hose materials at low ambient temperatures.
B
Cold flow describes the deep, permanent impression left in a natural or synthetic rubber hose by the pressure of hose clamps or supports.
(AM.I.D.K2)- FAA-H-8083-30
8203
Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by
A. using short, straight sections of tubing between fixed parts of the aircraft.
B. using tubing of the same material as the majority of the adjoining structure.
C. providing bends in the tubing.
C
Never select a path for a rigid fluid line that does not require bends in the tubing. Bends are necessary to permit the tubing to expand and contract under temperature changes and to absorb vibration.
(AM.I.D.K2)-FAA-H-8083-30
