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?
AN-818-8
8193 - Metal tubing fluid lines are sized by wall thickness and
outside diameter in 1/16 inch increments
8193-1 - Roling-type Flaring Tools are used to flare _______, _______, and _________ tubing.
soft copper, aluminum, and brass
8194 - 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 f
3, 1, 6, 2, 5, 4
8195 - 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.
8196 - What is an advantage of a double flare on aluminum tubing?
More resistant to damage when the joint is tightened.
8197 - A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it
contracts in length and expands in diameter.
8198 - The term "cold-flow" is generally associated with
impressions left in natural or synthetic rubber hose material
8199 - What is the color of an AN steel flared-tube fitting
Black
8200 - 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 compo
1. AN fittings have an identifying shoulder between the end of the threads and the flare cone.
8201 - Flexible lines must be installed with
a slack of 5-8% of the length
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
52 and 1/2 inches long
8203 - Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by
providing bends in the tubing
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?
.606 inches ( 2X wall thickness subtracted from outside diameter)
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
the possibility of reducing the flare thickness by wiping or ironing during the tightening process.
8206 - 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 /fi
1
8207 - When flaring aluminum tubing for use with AN fittings, the flare angle must be
37 degrees
8208 - Scratches or nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than
10 percent of the wall thickness
8209 - Flexible hose used in aircraft systems is classified in size according to the
inside diameter
8209-1 - When a Teflon hose has been in service for a time, what condition may have occurred and/or what precaution should be taken when it is temporarily removed from the aircraft?
The hose may have developed a set, or have been manufactured with a pre-set shape, and must be supported to maintain its shape
8210 - A scratch or nick in aluminum tubing can be repaired provided it does not
appear in the heel of a bend
8211 - 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
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?
Corrosion-resistant steel annealed of 1/4H
8213 - When installing bonded clamps to support metal tubing,
remove paint or anodizing from tube at clamp location
8214 - In a metal tubing installation
tension is undesirable because pressurization will cause it to expand and shift
8214-1 - The best tool to use when cutting aluminum tubing, or any tubing of moderately soft metal is a
hand operated wheel-type tubing cutter
8214-2 - The primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs is to
prevent excessive stress on the tubing
8214-3 - 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
8215 - A gas or fluid line marked with the letters PHDAN is
used to carry a hazardous substance
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?
Symbols are always black against a white background regardless of line content
8215-2 - If flared tube coupling nut is overtightened, where is the tube most likely to be weakened/damaged?
At the sleeve and flare junction
8217 - (1) Bonded clamps are used for support when installing tubing (2) Unbonded clamps are used for support when installing wiring.
both No. 1 and No. 2 are true
8217-1 - Which statement is true regarding flattening of tubing in bends?
Flattening by not more than 25 percent of the original diameter is permissible
8218 - A 3/8 inch aircraft high pressure flexible hose as compared to 3/8 inch metal tubing used in the same system will
have equivalent flow characteristics
8221-1 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 straigh
1, 2, 3, and 5
8318 - A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3,000 psi) is used to operate brakes
that are designed to work with lower pressure
8322 - Debooster valves are used in brake systems primarily to
reduce the pressure and release the brakes rapidly
8336 - The purpose of a sequence valve in a hydraulic retractable landing gear system is to
ensure operation of the landing gear and gear doors in the proper order
8349 - Debooster cylinders are used in brake systems primarily to
reduce the pressure to the brake and increase the volume of fluid flow
8379 - A flexible hydraulic hose identified as MIL-H_8788 will have a stripe running the length of the hose. This stripe
is used to ensure that the hose is installed without excessive twisting
8389 - Select the valve used in a hydraulic system that directs pressurized fluid to one end of an actuating cylinder and simultaneously directs return fluid to the reservoir from the other end.
Selector
8398 - The component in the hydraulic system that is used to direct the flow of fluid is the
selector valve
8399 - What type of selector valve is one of the most commonly used in hydraulic systems to provide for simultaneous flow of fluid into and out of a connected actuating unit?
Four-port, closed center valve
8401 - The purpose of the pressure regulator in a hydraulic system is to
maintain system operating pressure within a predetermined range and to unload the pump
8404 - If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening
may distort the flare
8405 - The installation of a new metal hydraulic line should be made with
enough bends to allow the tube to expand and contract with temperature changes and to absorb vibration
8409 - Which fitting is an AN flared -tube fitting?
1
8432 - The hydraulic component that automatically directs fluid from either the normal source or an emergency source to an actuating cylinder is called a
Shuttle valve
8432-1 - What is commonly used to connect an emergency source of power, and at the same time disconnect the normal hydraulic source from critical parts of a landing gear or wheel braking system for operation (usually when the normal source system fails)?
Shuttle valve
8438 - Unloading valves are used with many engine-driven hydraulic pumps to
relieve the pump pressure
8452 - The unit which causes one hydraulic operation to follow another in a definite order is called a
sequence valve
8453 - The purpose of a hydraulic pressure regulator is to
relieve the pump of its load when no actuating units are being operated
8455 - What type of valve in an aircraft hydraulic system permits fluid to flow freely in one direction, but restricts the rate at which fluid is allowed to flow in the other direction?
Orifice check valve
8463 - Some hydraulic systems incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above an established rate. This device is generally referred to as a
Hydraulic fuse
8487 - Hydraulic system thermal relief valves are set to open at a
higher pressure than the system relief valve
8490 - Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of the hydraulic tube providing they are less than what percent of the tube diameter?
20
8492 - The purpose of restrictors in hydraulic systems is to
control the rate of movement of hydraulically operated mechanisms
8495 - Teflon hose that has developed a permanent set from being exposed to high pressure or temperature should
not be straightened or bent further
8587 - The operating mechanism of most hydraulic pressure gauges is
a Bourdon tube
8960 - In most modern hydraulically actuated landing gear systems, the order of gear and fairing door operation is controlled by
sequence valves