M7.9 Flashcards
What are the four processes in pipe forming?
A) Cutting, Bending, Flaring, Belling
B) Cutting, Bending, Welding, Flaring
C) Cutting, Bending, Soldering, Flaring
A) Cutting, Bending, Flaring, Belling
What is the measurement unit used for the Outside Diameter (OD) of metal piping?
A) 16 Inches
B) 16 Millimeters
C) 16ths of an inch
C) 16ths of an inch
What type of saw should be used if a pipe cutter is unavailable?
A) Hacksaw with a fine tooth (32 TPI)
B) Jigsaw with a coarse tooth
C) Circular saw
A) Hacksaw with a fine tooth (32 TPI)
How much longer should the pipe be cut than the required length?
A) 10% longer
B) 5% longer
C) 15% longer
A) 10% longer
What is the proper technique for using a pipe cutter?
A) Apply heavy pressure on the cutting wheel
B) Rotate the cutter around the pipe with light, intermittent pressure
C) Cut quickly without rotating
B) Rotate the cutter around the pipe with light, intermittent pressure
What should be done before bending a pipe?
A) Cut the pipe
B) Lubricate the pipe at the bend point
C) Heat the pipe
B) Lubricate the pipe at the bend point
What must be avoided when bending pipes?
A) Making the pipe longer
B) Flattening, kinking, or wrinkling the pipe
C) Using the wrong bending tool
B) Flattening, kinking, or wrinkling the pipe
What does the manufacturer recommend for bending offsets?
A) Always use a 90° bend
B) Always use a 45° angle
C) Avoid bending offsets entirely
B) Always use a 45° angle
Which angle does not require the use of an offset calculator for pipe bending?
A) 45°
B) 30°
C) 90°
C) 90°
What is the standard flare angle used in aircraft piping systems?
A) 30°
B) 37°
C) 45°
B) 37°
What is the main advantage of a double flare over a single flare?
A) It is faster to create
B) It provides a better seal and is more durable
C) It is less expensive to manufacture
B) It provides a better seal and is more durable
What are the two types of flare used in aircraft piping systems?
A) Single flare and double flare
B) Single flare and triple flare
C) Double flare and quadruple flare
A) Single flare and double flare
What is the preferred method for creating a flare in aircraft piping systems?
A) Impact-type flaring tool
B) Roll-type flaring tool
C) Hammering
B) Roll-type flaring tool
What is a key feature of the roll-type flaring method?
A) Hammering is required to form the flare
B) No hammering is required
C) It creates a double flare
B) No hammering is required
AN. Feature. AC
37°. Angle. 35°
Yes. Recess. No
Coarser. thread. finer
blue/black. colour. yellow/grey
Longer. Body Length. Shorter
What are the two methods used to create a single flare?
A) Impact-type flaring tool and manual twisting
B) Impact-type flaring tool and roll-type flaring tool
C) Roll-type flaring tool and hammering
B) Impact-type flaring tool and roll-type flaring tool
Which type of pipe is best suited for double flaring?
A) Stainless steel pipe
B) Soft aluminium pipe with an outside diameter of 3/8 in or smaller
C) Titanium pipe
B) Soft aluminium pipe with an outside diameter of 3/8 in or smaller
What is the advantage of using a Permaswage fitting?
A) It can be made quickly and gives a good seal
B) It is vibration-resistant
C) It can be easily separated during disassembly
A) It can be made quickly and gives a good seal
What is the main disadvantage of a Permaswage fitting?
A) It cannot be separated during disassembly
B) It is not vibration-resistant
C) It takes too long to create
A) It cannot be separated during disassembly
What is the purpose of the sleeve in a flare-type fitting?
A) To create a larger connection
B) To prevent vibration from concentrating on the flare
C) To enhance the aesthetic of the flare
B) To prevent vibration from concentrating on the flare
What is applied to the inside and outside of the pipe when belling?
A) Lubricating oil
B) Sandpaper
C) Water
A) Lubricating oil
What is the purpose of belling the end of ridged piping lines?
A) To increase the pressure of fluids
B) To connect the pipe to rubber hoses
C) To prevent leakage from the pipe
B) To connect the pipe to rubber hoses
Belling is commonly used for connecting pipes carrying what type of fluid?
A) High-pressure fluids
B) Low-pressure fluids or air
C) Hazardous chemicals
B) Low-pressure fluids or air
Why are flexible hoses used in aircraft instead of rigid pipes?
A) For moving parts or areas subject to vibration
B) To enhance fuel efficiency
C) To reduce weight
A) For moving parts or areas subject to vibration
What is typically included on the tape that identifies aircraft pipes?
A) Words, symbols, and color coding
B) Only numbers
C) Only pictures of aircraft
A) Words, symbols, and color coding
Why are medium and low-pressure lines in aircraft usually made of aluminum alloys?
A) To improve strength
B) To save weight
C) To increase durability
B) To save weight
Which materials are typically used for high-pressure lines in aircraft?
A) Aluminum alloys
B) Steel or titanium
C) Copper or brass
B) Steel or titanium
What pressure defines a high-pressure line in aircraft?
A) Below 1500 psi (105 bar)
B) Over 1500 psi (105 bar)
C) Below 725 psi (50 bar)
B) Over 1500 psi (105 bar)
What is the operating pressure range for medium-pressure lines?
A) Below 1500 psi (105 bar)
B) Above 3000 psi (210 bar)
C) Between 100 psi (7 bar) and 1500 psi (105 bar)
A) Below 1500 psi (105 bar)
Which type of pressure line is used for suction and return lines?
A) High-pressure lines
B) Medium-pressure lines
C) Low-pressure lines
C) Low-pressure lines
What material is commonly used for hoses in engine and hydraulic systems of aircraft?
A) Polyethylene
B) Polytetrafluoroethylene (PTFE)
C) Nylon
B) Polytetrafluoroethylene (PTFE)
Why is Polytetrafluoroethylene (PTFE) used in engine and hydraulic system hoses?
A) It is lightweight
B) It is chemically inert and unaffected by synthetic oils and fluids
C) It can withstand extreme temperatures
B) It is chemically inert and unaffected by synthetic oils and fluids
Why are flexible hoses required in aircraft to connect stationary and moving parts?
A) To reduce weight
B) To handle high vibration areas, such as undercarriage retraction systems
C) To increase fuel efficiency
B) To handle high vibration areas, such as undercarriage retraction systems
What is the purpose of the “Lay Lines” on aircraft hoses?
A) To indicate the material composition of the hose
B) To prevent hoses from becoming tangled during storage
C) To ensure the hose isn’t twisted during installation
C) To ensure the hose isn’t twisted during installation
What is the primary advantage of using synthetic rubber in aircraft hoses?
A) It is lightweight and easy to manufacture
B) It withstands high pressures, temperatures, oils, and fuels
C) It is resistant to corrosion from saltwater
B) It withstands high pressures, temperatures, oils, and fuels
Important
On a hose what does 4/90 mean in terms of dates
4 - stands for quarter of year
90 - stands for the year it was made
What is the rule regarding repairs to engine pipes in aircraft?
A) Engine pipes can be repaired if they are damaged
B) Engine pipes must always be replaced, not repaired
C) Engine pipes can be temporarily sealed
B) Engine pipes must always be replaced, not repaired
What is an important consideration when using CRES pipes for repairs in aircraft?
A) CRES pipes are cheaper than other materials
B) The weight penalty must be considered when using CRES pipes
C) CRES pipes are always preferred for repairs
B) The weight penalty must be considered when using CRES pipes
Which combination of materials can be used to repair aircraft pipes, except in the pylon?
A) Aluminium alloy with CRES
B) CRES with Titanium alloy
C) Titanium alloy with Aluminium alloy
B) CRES with Titanium alloy
Generally, how are aircraft pipes repaired?
A) With a pipe made of the same material
B) With any material available
C) With plastic pipes only
A) With a pipe made of the same material
If an aluminium alloy pipe is not available for repair, what materials can be used instead?
A) CRES or Titanium alloy
B) Only rubber or plastic pipes
C) Steel alloy or copper
A) CRES or Titanium alloy
What is the permissible limit for a scratch or nick in aluminium alloy piping?
A) No deeper than 10% of the wall thickness, and not in the heel of a bend
B) No deeper than 20% of the wall thickness
C) No deeper than 50% of the wall thickness
A) No deeper than 10% of the wall thickness, and not in the heel of a bend
When can a pipe with a dent of less than 20% of its diameter still be acceptable?
A) If the dent is located in the heel of a bend
B) If the dent is in a straight section of the pipe
C) If the dent exceeds the allowable limits
B) If the dent is in a straight section of the pipe
What should be done when repairing a dent in an aluminium pipe that is located in the heel of a bend?
A) It can be repaired as long as the dent is less than 20% of the pipe diameter
B) The dent must be replaced, as it cannot be repaired in this location
C) The dent should be smoothed out with sandpaper
B) The dent must be replaced, as it cannot be repaired in this location
What is the maximum allowable size for sharp-bottomed surface defects in aircraft piping?
A) 10% of the pipe’s wall thickness
B) 5% of the pipe’s wall thickness
C) 2% of the pipe’s nominal diameter
B) 5% of the pipe’s wall thickness
What is the maximum permissible size for round-bottomed surface defects in aircraft piping?
A) 10% of the pipe’s wall thickness
B) 5% of the pipe’s wall thickness
C) 20% of the pipe’s nominal diameter
A) 10% of the pipe’s wall thickness
Why are flexible hoses used in aircraft?
A) To reduce weight
B) To connect stationary parts to moving parts and high vibration areas
C) To improve fuel efficiency
B) To connect stationary parts to moving parts and high vibration areas
What is the pressure rating for low-pressure hoses?
A) Up to 600 psi (4137 kPa)
B) Up to 3000 psi (20,685 kPa)
C) Over 3000 psi (20,685 kPa)
A) Up to 600 psi (4137 kPa)
What is the pressure rating for medium-pressure hoses?
A) Up to 600 psi (4137 kPa)
B) Up to 3000 psi (20,685 kPa)
C) Over 3000 psi (20,685 kPa)
B) Up to 3000 psi (20,685 kPa)
What is the pressure rating for high-pressure hoses?
A) Up to 600 psi (4137 kPa)
B) Up to 3000 psi (20,685 kPa)
C) 3000 psi or over (20,685 kPa)
C) 3000 psi or over (20,685 kPa)
What is the outer covering of low-pressure hoses usually made of?
A) Reinforced rubber or textile braid
B) Metal mesh
C) Plastic coating
A) Reinforced rubber or textile braid
Which of the following materials are commonly used for the reinforcement layer in medium-pressure hoses?
A) Fabric, Wire, Kevlar®
B) Rubber, Plastic, Cotton
C) Steel, Copper, Aluminium
A) Fabric, Wire, Kevlar®
What is the construction of a high-pressure hose liner?
A) A single rubber layer
B) A liner covered by one or two closely woven wire braids
C) A plastic coating
B) A liner covered by one or two closely woven wire braids
What colors are typically used for lay lines on hoses?
A) Blue, Green, and Orange
B) Yellow, Red, or White
C) Black and Grey
B) Yellow, Red, or White
At what pressure is the hose typically proof-tested?
A) At the working pressure
B) 1.5 times the working pressure
C) Twice the working pressure
B) 1.5 times the working pressure
What is the first step in preparing a hose assembly for use?
A) Check the manufacturer’s label
B) Clean the hose out internally with compressed air blown from both directions
C) Perform a visual inspection
B) Clean the hose out internally with compressed air blown from both directions
What must be checked on the hose’s identification tag?
A) Only the part number
B) Part number, cure date, and assembly date
C) The weight and size
B) Part number, cure date, and assembly date
How often should hoses be supported during installation?
A) Every 60 cm (24 inches)
B) Every 120 cm (48 inches)
C) Every 150 cm (60 inches)
A) Every 60 cm (24 inches)
What can be used to replace a short bend radius in hose installation?
A) A straight fitting
B) An elbow fitting
C) A flexible coupling
B) An elbow fitting
What is the purpose of protective sleeves for hoses on an aircraft?
A) To provide insulation only
B) To protect from abrasion or extreme heat
C) To enhance the hose’s flexibility
B) To protect from abrasion or extreme heat
What are the three types of protective sleeving materials for hoses?
A) Heat shrink, Nylon spiral wrap, Teflon
B) Rubber, Metal, Plastic
C) Cotton, PVC, Foam
A) Heat shrink, Nylon spiral wrap, Teflon
What must all fuel lines be bonded to?
A) The engine
B) The aircraft structure with integrally bonded line support clamps
C) The wings
B) The aircraft structure with integrally bonded line support clamps
Where must fluid lines not be routed?
A) Engine compartments
B) Under the wings
C) Passenger compartments
C) Passenger compartments
What is the purpose of support clamps in fluid line installation?
A) To make the fluid lines more flexible
B) To add decoration
C) To secure fluid lines, prevent chafing, and reduce stress
C) To secure fluid lines, prevent chafing, and reduce stress
Which type of clamp is used to secure fluid lines subject to vibration?
A) Plain clamp
B) Rubber cushioned clamp
C) Stainless steel clamp
B) Rubber cushioned clamp
What is the primary purpose of plain clamps in fluid line installation?
A) To provide basic support
B) To secure lines subject to vibration
C) To add flexibility to the lines
A) To provide basic support
Where are Teflon® cushioned clamps used, and why?
A) In high-pressure areas to increase fluid flow
B) In areas subject to contamination by fuel or hydraulic fluid, because Teflon® is resistant to deterioration
C) In areas with extreme temperatures to enhance flexibility
B) In areas subject to contamination by fuel or hydraulic fluid, because Teflon® is resistant to deterioration
What is the primary function of a bonded clamp in aircraft fluid line installation?
A) To secure lines and prevent corrosion
B) To secure metal lines and ground the line to the aircraft structure
C) To reduce vibrations in fluid lines
B) To secure metal lines and ground the line to the aircraft structure
What is attached to a bonded clamp to ensure grounding of the fluid line?
A) A metal hose fitting
B) An electrical lead connected to the aircraft structure
C) A rubber gasket
B) An electrical lead connected to the aircraft structure
What part of the pipe assembly should never have lubricant applied?
A) The male fitting thread
B) The female thread
C) The sleeve nut
B) The female thread
Why must pipes have at least one bend between fittings during installation?
A) To allow for thermal expansion and pressure flexing
B) To make the pipe look aesthetically pleasing
C) To reduce the number of fittings required
A) To allow for thermal expansion and pressure flexing
