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Aircraft Tubes/Lines

Aircraft fluid lines and fittings

QuestionAnswer
Of what material are most low-pressure rigid fluid lines made? 1100-1/2 hard or 3003-1/2 hard aluminum alloy
Is the size of a rigid fluid line determined by its inside or outside diameter? Outside diameter
When routing a fluid line parallel to an electrical wire bundle, which should be on top? The electrical bundle
What is the function of the lay line (the identification stripe) that runs the length of a flexible hose? Shows if the line is twisted during installation
How can you distinguish an AN fluid line fitting from an AC fitting? AN has a shoulder between the end of the flare cone and first thread.
Where are quick-disconnect fluid line couplings normally used in an aircraft hydraulic system? Where the engine-driven pump connects into the hydraulic system.
Is the size of a flexible hose determined by its inside or its outside diameter? Inside diameter
What is the minimum amount of slack that must be left when a flexible hose is installed in an aircraft hydraulic system? At least 5% longer than the distance between the fittings.
How tight should an MS flareless fitting be tightened? By hand until snug, and then turn it with a wrench for 1/6-turn to 1/3-turn
What damage can be caused by over-tightening an MS flareless fitting? Over-tightening drives the cutting edge of the sleeve deeply into the tube and weakens it.
What kind of rigid tubing can be flared with a double flare? 5052-o and 6061-T aluminum alloy tubing in sizes from 1/8-inch to 3/8-inch OD.
What is the principal advantage of Teflon hose for use in an aircraft hydraulic system? Teflon hose retains its high strength under conditions of high temperature.
What precautions should be taken when flaring a piece of aluminum alloy tubing? The end of the tubing should be polished so it will not crack when it is stretched with the flaring tool.
How much pressure is used to proof test a flexible hose assembly? Varies with the hose, but usually about two times the recommended operating pressure.
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 AN818-8 nut will fit the 1/2-inch line (the -8 is for 8/16 or 1/2).
Metal tubing fluid lines are sized by wall thickness and ________. outside diameter in 1/16 inch increments.
Hydraulic tubing, which is damaged in a localized area to such an extent that repair is necessary, may be repaired by... by cutting out the damage and using a swaged tube fitting to join the tube ends.
What is an advantage of a double flare on aluminum tubing? It is more resistant to the shearing effect of torque.
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.
The term "cold flow" is generally associated with... rubber hoses
What is the color of an AN steel flared-tube fitting? Black
Flexible lines must be installed with... a slack of 5 to 8 percent of the length.
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.
The material specifications for a certain aircraft require that a replacement oil line be fabricated from 3/4-inch 0.072 5052-o aluminum alloy tubing. What is the inside dimension of this tubing? 0.606
When flaring aluminum tubing for use with AN fittings, the flare angle must be... 37 degrees
Scratches and nicks on the straight portion of aluminum alloy tubing may be repaired if they are no deeper than... 10 percent of the wall thickness
Flexible hose used in aircraft systems is classified in size according to the... inside diameter
A scratch or nick in aluminum alloy tubing can be repaired by burnishing provided the scratch or nick does not... appear in the heal of the bend
When installing bonded clamps to support metal tubing... remove paint or anodizing from tube at clamp location
What is the policy for metal tubing tension? tension is undesirable because pressurization will cause it to expand and shift.
What is meant when a gas or fluid line marked with the letters PHDAN? the line is carrying a substance which may be dangerous to personnel
Created by: bgilbert
 

 



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