M7.18 Flashcards
What are two methods for scheduling aircraft maintenance?
A) Manufacturer guidelines and maintenance logs
B) Flying hours or a calendar inspection system
C) Pre-flight and post-flight checks
B) Flying hours or a calendar inspection system
What is the term ‘damage’ defined as in the Structure Repair Manual (SRM)?
A) A minor scratch on a structural member
B) A cross-sectional area or permanent distortion of a structural member
C) A missing fastener
B) A cross-sectional area or permanent distortion of a structural member
What does the term ‘defect’ mean in the context of aircraft inspection?
A) A minor scratch with no impact on serviceability
B) Any event or condition reducing the serviceability of the aircraft
C) A temporary condition that resolves itself during operation
B) Any event or condition reducing the serviceability of the aircraft
What type of damage is defined as a continuous, sharp groove caused by a sharp object?
A) Gouge
B) Scratch
C) Nick
A) Gouge
What tools or methods are commonly used to inspect and assess damage on aircraft structures?
A) Micrometers and calipers
B) Visual inspection and SRM guidelines
C) Straight edge and feeler gauges
B) Visual inspection and SRM guidelines
Which category applies to damage that is within limits and does not require repair?
A) Non-Repairable Damage
B) Allowable Damage
C) Non-Allowable Damage
B) Allowable Damage
What is the classification for damage that requires replacement?
A) Allowable Damage
B) Non-Allowable Damage
C) Non-Repairable Damage
C) Non-Repairable Damage
What is the classification for damage that requires a repair to restore serviceability?
A) Allowable Damage
B) Non-Allowable Damage
C) Non-Repairable Damage
B) Non-Allowable Damage
What type of inspection methods are often used for detecting damage in aircraft?
A) Non-Destructive Inspection (NDI)
B) Temperature check
C) Visual only
A) Non-Destructive Inspection (NDI)
What tools or aids are commonly used to assist in visual aircraft inspections?
A) Only a flashlight
B) A variety of visual aids, from torches to complex optical instruments
C) A screwdriver and wrench
B) A variety of visual aids, from torches to complex optical instruments
Why might an inspection mirror have its own light source?
A) To reduce glare and dazzle during inspection
B) To make it easier to see at night
C) To check for electrical issues in the aircraft
A) To reduce glare and dazzle during inspection
What is the most common magnification used for inspection mirrors?
A) 5x
B) 2x
C) 10x
B) 2x
What type of magnifying glass is commonly used for viewing inside aircraft structures?
A) Pocket magnifying glass with 2x magnification
B) Hand instrument with 8x magnification and light source
C) Stereoscopic magnifying glass with 20x magnification
B) Hand instrument with 8x magnification and light source
Why is a magnifying glass with its own light source useful in aircraft inspections?
A) It helps illuminate hard-to-reach areas for clearer visibility
B) It measures temperature inside components
C) It checks the structural integrity of engines
A) It helps illuminate hard-to-reach areas for clearer visibility
What is a borescope used for in aircraft maintenance?
A) To measure fuel consumption
B) To inspect the internal structure or components of the aircraft engine
C) To calibrate the turbine speed
B) To inspect the internal structure or components of the aircraft engine
What feature of some borescopes allows for documentation during inspections?
A) A built-in radar sensor
B) A camera attachment for taking photographs
C) A heat sensor to detect temperature changes
B) A camera attachment for taking photographs
What is the alternative name for a borescope?
A) Micro-scope
B) Introscope or fiberscope
C) Thermoscope
B) Introscope or fiberscope
What are the three visual tools commonly used in aircraft inspections?
A) Inspection mirrors, magnifying glass, and borescopes
B) Micrometers, calipers, and dial indicators
C) Thermometers, radar, and pressure gauges
A) Inspection mirrors, magnifying glass, and borescopes
When inspecting a painted surface for corrosion, what are common signs?
A) A smooth, flawless finish
B) A scaly or blistered surface, a change of color, or blisters in the paint
C) A shiny metallic finish
B) A scaly or blistered surface, a change of color, or blisters in the paint
How can corrosion on a metallic surface typically be observed?
A) A smooth, shiny surface with no visible damage
B) A dull or darkened area, a pitted surface, or white, grey, or red dust or particles
C) A bright, reflective finish
B) A dull or darkened area, a pitted surface, or white, grey, or red dust or particles
When is chemical paint removal preferred over mechanical removal?
A) When the corrosion is light and contained
B) When the corrosion is severe and widespread
C) When the surface is rough
B) When the corrosion is severe and widespread
Why must fasteners be removed before corrosion removal?
A) To prevent cross-contamination between dissimilar metals
B) To avoid damaging the fasteners
C) To ensure a clean surface for painting
A) To prevent cross-contamination between dissimilar metals
When is mechanical paint removal typically used?
A) When the corrosion is heavy and widespread
B) When the corrosion is light and contained within a small area
C) When chemical strippers are not available
B) When the corrosion is light and contained within a small area
When is abrasion by hand most suitable for corrosion removal?
A) For large areas of heavy corrosion
B) For areas of light corrosion
C) For deep pitting corrosion
B) For areas of light corrosion
What method is typically used for removing heavy corrosion from aircraft components?
A) Abrasion by hand
B) Chemical stripping
C) Wire brushing
C) Wire brushing
Why is wire brushing best suited for steel components and not recommended for aluminium parts?
A) Steel is more resistant to abrasion
B) Wire brushing causes further corrosion in aluminium
C) Aluminium parts are too soft for wire brushing
B) Wire brushing causes further corrosion in aluminium
Why is grinding not suitable for use on aluminium alloys?
A) Aluminium particles clog the grinding discs
B) Aluminium is too hard for grinding
C) Grinding cannot remove corrosion from aluminium
A) Aluminium particles clog the grinding discs
Why should hot temperatures be avoided when grinding?
A) It may cause the material to become too soft
B) It can change the mechanical properties of the material
C) It can cause excessive wear on the grinding disc
B) It can change the mechanical properties of the material
When is a rotary file necessary for corrosion removal?
A) When the corrosion is light
B) When the corrosion is heavy
C) When the surface is already polished
B) When the corrosion is heavy
What method is commonly used for removing filiform corrosion from metal surfaces?
A) Grinding
B) Abrasive blasting
C) Wire brushing
B) Abrasive blasting
What should be used to check if all corrosion has been completely removed after abrasive blasting?
A) Eye inspection
B) 10x magnifying glass
C) Borescope
B) 10x magnifying glass
What is the minimum amount of time the neutralizing agent should be left to work?
A) 1 to 5 minutes
B) 5 to 20 minutes
C) 20 to 30 minutes
B) 5 to 20 minutes
What is the primary purpose of using a chromic acid inhibitor on corroded aluminium surfaces?
A) To restore the protective oxide coating on the metal surface
B) To remove all corrosion and paint
C) To make the surface more visually appealing
A) To restore the protective oxide coating on the metal surface
What are the three common types of corrosion that affect aluminium alloys?
A) Surface corrosion, galvanic corrosion, and stress corrosion cracking
B) Pitting corrosion, stress corrosion cracking, and intergranular corrosion
C) Filiform corrosion, exfoliation corrosion, and intergranular corrosion
B) Pitting corrosion, stress corrosion cracking, and intergranular corrosion
What is the most common type of corrosion found on steel?
A) Stress corrosion cracking
B) Pitting corrosion
C) Rust (ferrous oxide)
C) Rust (ferrous oxide)
What is the most commonly used rust removal chemical?
A) Sodium hydroxide
B) Phosphoric acid
C) Sulfuric acid
B) Phosphoric acid
What does corrosion on stainless steel and nickel chromium alloys usually appear as?
A) Flaking and white powder
B) Black pitting
C) Red rust
B) Black pitting
How can deterioration on titanium surfaces be identified?
A) Red or brown oxide
B) Black or white oxide
C) Blue or green oxide
B) Black or white oxide
What is prohibited for cleaning corrosion from titanium parts?
A) Fibre brushes
B) Aluminium polish
C) Steel wool
C) Steel wool
How can deterioration on titanium surfaces be identified?
A) Red or brown oxide
B) Black or white oxide
C) Blue or green oxide
B) Black or white oxide
What tools are prohibited for cleaning corrosion from titanium parts?
A) Fibre brushes and aluminium polish
B) Steel wool, iron scrapers, or steel brushes
C) Mild abrasives and hand polish
B) Steel wool, iron scrapers, or steel brushes
What is the key difference between the Selective Method and the Tank Method in anodising?
A) The Selective Method uses smaller tanks compared to the Tank Method.
B) The Tank Method dips the whole component, while the Selective Method plates only a specific area.
C) The Selective Method uses no electrical power, unlike the Tank Method.
B) The Tank Method dips the whole component, while the Selective Method plates only a specific area.
What does CAA stand for in the anodising process?
A) Chromic Acid Anodising
B) Chemical Acid Application
C) Corrosion Anodising Action
A) Chromic Acid Anodising
What does ELOXAL stand for?
A) Electrolysis of Oxidised Aluminium
B) Electric Oxidise Aluminium
C) Electro-Oxidation of Alloys
B) Electric Oxidise Aluminium
What does SAA stand for?
A) Sulfuric Acid Anodising
B) Sulphuric Aluminium Anodising
C) Superficial Anodising Application
A) Sulfuric Acid Anodising
What are the three main types of phosphate coatings?
A) Copper, Zinc, Aluminium
B) Manganese, Iron, Zinc
C) Lead, Steel, Zinc
B) Manganese, Iron, Zinc
What does CCC stand for in corrosion protection?
A) Corrosion Control Coating
B) Chemical Conversion Coating
C) Certified Corrosion Coating
B) Chemical Conversion Coating
Which metal is commonly treated with chromate conversion coatings?
A) Steel
B) Aluminium
C) Copper
B) Aluminium
What is the maximum operating temperature for components treated with CCC?
A) 100°C
B) 70°C
C) 50°C
B) 70°C
What are the two main purposes of paint finishes on aircraft?
A) Aesthetic decoration and corrosion protection
B) To reduce weight and improve aerodynamics
C) To increase engine performance and durability
A) Aesthetic decoration and corrosion protection
How many layers comprise the paint system for the Airbus outer fuselage skin?
A) Two
B) Three
C) Four
B) Three
How many layers comprise the paint system for Boeing’s aircraft?
A) One
B) Two
C) Three
B) Two
What are the three types of surface protection repairs?
A) Fixing, Partial or Total Renewal, Basic Renewal
B) Basic Renewal, Painting, Sanding
C) Fixing, Cleaning, Repainting
A) Fixing, Partial or Total Renewal, Basic Renewal
Which surface protection repair type involves the most extensive work?
A) Fixing
B) Partial or Total Renewal
C) Basic Renewal
C) Basic Renewal
Which surface protection repair type requires the complete removal of paint?
A) Fixing
B) Partial or Total Renewal
C) Basic Renewal
C) Basic Renewal
What is the minimum coverage required for electrically conductive paint on composite components?
A) 50% of countersinks
B) 75% of all countersinks
C) 100% of all countersinks
B) 75% of all countersinks
What must NOT be covered with electrically conductive paint?
A) Antenna covers
B) The outer skin of the aircraft
C) The areas around the windows
A) Antenna covers
What is a key characteristic of Dinitrol products?
A) They only work at high temperatures
B) They have water-displacing and corrosion-inhibiting properties
C) They are only effective for short periods of time
B) They have water-displacing and corrosion-inhibiting properties
What is commonly used to assist in the removal of a seized fastener?
A) Penetrating oil
B) A hammer
C) A wrench
A) Penetrating oil
What items are usually discarded following removal from an aircraft?
A) Filters, sealing rings, fuels, and oils
B) Bolts and screws
C) Electrical components
A) Filters, sealing rings, fuels, and oils
What does the Hi-Lite fastener’s excellent strength-to-weight ratio refer to?
A) Its ability to hold heavy loads
B) Its light weight compared to its strength
C) Its resistance to corrosion
B) Its light weight compared to its strength
What are the two standard forms of blind rivets?
A) Solid lock and shear lock
B) Friction lock and mechanical lock
C) Pull-through and self-plugging
B) Friction lock and mechanical lock
What is the definition of sealing in aircraft maintenance?
A) The process of increasing the strength of aircraft materials
B) The process of confining liquids and gases within a given area or preventing them from entering restricted areas
C) The process of making the aircraft more aerodynamic
B) The process of confining liquids and gases within a given area or preventing them from entering restricted areas
What are the four levels of sealing required for different areas on an aircraft?
A) Basic, Advanced, Standard, Critical
B) Absolute, Extensive, Intermediate, Limited
C) High, Medium, Low, No Sealing
B) Absolute, Extensive, Intermediate, Limited
What is the main distinguishing factor between silicone and non-silicone sealing compounds?
A) Silicone compounds are used where heat resistance is required
B) Non-silicone compounds are always red in colour
C) Non-silicone compounds are used for heat-resistant applications
A) Silicone compounds are used where heat resistance is required
What are the typical colours of silicone sealing compounds?
A) White, red, or grey
B) Blue, green, or yellow
C) Black, brown, or purple
A) White, red, or grey
What colours can non-silicone sealing compounds be?
A) White, red, or grey
B) Any colour
C) Black, brown, or purple
B) Any colour
Which class of sealant is thinned with solvent to provide a viscosity suitable for brushing?
A) Class A
B) Class B
C) Class C
A) Class A
Which class of sealant is designed to have a relatively heavy consistency with good thixotropic properties, ideal for filleting?
A) Class A
B) Class B
C) Class C
B) Class B
Which class of sealant has a medium consistency that is designed for good spreadability on faying surfaces?
A) Class A
B) Class B
C) Class C
C) Class C
Which of the following classes of sealants is specifically designed to be sprayable?
A) Class A
B) Class E and F
C) Class D
B) Class E and F
Which class of sealant is designed for hole-filling applications with very low slump properties?
A) Class A
B) Class C
C) Class D
C) Class D
What does “tack-free time” mean?
A) The time required for the sealant to be squeezed out of a joint when fasteners are installed.
B) The time after thawing during which the sealant can be applied to the structure.
C) The time required for the sealant to cure enough so it will not transfer to the finger or plastic film.
C) The time required for the sealant to cure enough so it will not transfer to the finger or plastic film.
What are the environmental effects on the cure rate of sealants?
A) Higher temperatures and humidity accelerate the cure rate.
B) Lower temperatures and humidity accelerate the cure rate.
C) Cure rate is not affected by temperature or humidity.
A) Higher temperatures and humidity accelerate the cure rate.
Where are fillet seals typically used in aircraft construction?
A) On the interior surfaces of the aircraft only.
B) At the edges of structural joints, especially in fuel and pressure areas.
C) On the aircraft’s exterior for aesthetic purposes.
B) At the edges of structural joints, especially in fuel and pressure areas.
Where are injection seals commonly applied?
A) To the exterior of the aircraft for cosmetic purposes.
B) To fill channels and holes in the structure, often backing up a fillet seal.
C) Only in the cabin area for insulation.
B) To fill channels and holes in the structure, often backing up a fillet seal.
Where are faying surface seals primarily used?
A) For cosmetic purposes on external surfaces
B) To prevent corrosion and facilitate leak tracing in fuel tanks
C) To create aesthetic fillets on the fuselage
B) To prevent corrosion and facilitate leak tracing in fuel tanks
How do you apply a faying surface seal?
A) By spraying the sealant onto the surface
B) By applying sealant with a roller to achieve a thin, uniform coating
C) By pouring sealant into a container
B) By applying sealant with a roller to achieve a thin, uniform coating
Which of the following is true about the sealing process in an integral fuel tank?
A) The process involves three phases: one Class A layer and two Class B layers
B) The process involves only one phase with a Class A layer
C) The process involves only one phase with two Class B layers
A) The process involves three phases: one Class A layer and two Class B layers
