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Sample Module 6 Materials & Hardware Practice Questions
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1What are the primary alloying elements in AISI 4130 alloy steel commonly used in aircraft structural tubing?
A.Chromium and Molybdenum
B.Nickel and Copper
C.Manganese and Tungsten
D.Titanium and Vanadium
Explanation: AISI 4130 steel is a chromium-molybdenum alloy steel. The '41' designation denotes chromium (approx. 0.8–1.1%) and molybdenum (approx. 0.15–0.25%), while '30' indicates approximately 0.30% carbon content. It provides excellent strength-to-weight ratio, toughness, and weldability for aircraft tubular structures.
2What is the primary difference between full annealing and normalizing heat treatments of aircraft carbon and alloy steels?
A.Normalizing cools the steel in still air, producing a slightly harder and stronger structure than full annealing which cools slowly in the furnace
B.Full annealing cools the steel in cold water, while normalizing cools it slowly in an insulated furnace
C.Normalizing relieves internal stress without altering grain size, whereas annealing doubles the carbon percentage
D.Full annealing is conducted above the upper critical temperature, whereas normalizing is performed at room temperature
Explanation: Full annealing involves heating steel above its critical temperature followed by very slow cooling inside the furnace, resulting in maximum softness and ductility. Normalizing involves heating above the critical temperature and cooling in still air, which produces a finer grain structure with slightly higher strength and hardness than full annealing.
3Which surface hardening process introduces nitrogen into the outer layer of alloy steel parts such as engine crankshafts without requiring subsequent quenching?
A.Nitriding
B.Carburizing
C.Cyaniding
D.Flame hardening
Explanation: Nitriding is a surface hardening process in which steel parts are heated in an atmosphere of ammonia gas (NH3) at approximately 500°C (950°F). Nitrogen reacts with alloying elements (like aluminum, chromium, molybdenum) to form extremely hard nitrides. Because no liquid quench is required, dimensional distortion is virtually eliminated.
4When performing a Rockwell hardness test on hardened high-strength aircraft steel on the Rockwell C scale (HRC), which indenter and major load are used?
A.120° diamond brale cone with a 150 kg major load
B.1/16-inch hardened steel ball with a 100 kg major load
C.10 mm tungsten carbide ball with a 3000 kg major load
D.136° diamond pyramid with a 30 kg major load
Explanation: Rockwell C scale (HRC) tests hard materials (like heat-treated alloy steels) using a 120° diamond cone (Brale indenter) with a 150 kg major load (preceded by a 10 kg minor load). Rockwell B (HRB) uses a 1/16-inch steel ball indenter with a 100 kg major load for softer metals like aluminum.
5Which category of stainless steel contains approximately 18% chromium and 8% nickel, is non-magnetic in the annealed state, and cannot be hardened by thermal heat treatment?
A.Austenitic stainless steel (300 series)
B.Martensitic stainless steel (400 series)
C.Ferritic stainless steel (400 series)
D.Precipitation-hardening stainless steel (17-4PH)
Explanation: Austenitic stainless steels (such as 302, 304, and 316, often called 18-8 stainless steel) have a Face-Centered Cubic (FCC) austenite structure stabilized by nickel. They are non-magnetic in the annealed condition and can only be hardened by cold working (work hardening), not by heat treatment.
6What thermal heat treatment condition yields the highest tensile strength in 17-4PH precipitation-hardening stainless steel?
A.H900 (aged at 900°F / 482°C)
B.H1150 (aged at 1150°F / 621°C)
C.Condition A (solution annealed)
D.Condition O (fully soft annealed)
Explanation: 17-4PH stainless steel achieves its maximum ultimate tensile strength (approx. 1310 MPa / 190,000 psi) and peak hardness when precipitation aged at the lowest standard temperature, Condition H900 (900°F for 1 hour). Higher aging temperatures (like H1150) over-age the alloy, increasing toughness but reducing ultimate strength.
7During Magnetic Particle Inspection (MPI) of a steel landing gear axle, which magnetic field orientation is required to detect a longitudinal flaw running parallel to the long axis of the axle?
A.Circular magnetic field (passing current directly through the length of the axle)
B.Longitudinal magnetic field (using a surrounding solenoid/coil)
C.Transverse acoustic field
D.Demagnetized zero field
Explanation: Magnetic particle inspection detects flaws that run perpendicular to the lines of magnetic force. To detect a longitudinal flaw (parallel to the component axis), a circular magnetic field is required. Passing current directly through the part (head shot or central conductor) produces magnetic lines of force wrapped in circles around the axis, cutting across longitudinal cracks.
8Why must steel aircraft components be thoroughly demagnetized after completing Magnetic Particle Inspection (MPI)?
A.Residual magnetism attracts metallic filings causing accelerated bearing wear and interferes with magnetic compasses
B.Residual magnetism turns the steel into an electrical insulator, preventing ground bonding
C.Magnetism causes rapid intergranular corrosion along grain boundaries
D.Magnetism lowers the melting point of steel engine parts
Explanation: After MPI, residual magnetism must be removed by placing the part in a reversing, gradually decreasing AC magnetic field. Residual magnetism attracts ferrous metal chips/dust that can contaminate oil systems and destroy bearings, and causes deviation in aircraft magnetic compasses and sensitive instruments.
9What is the main objective of tempering a fully hardened (martensitic) carbon steel aircraft part?
A.To reduce brittleness and relieve internal quenching stresses while restoring ductility
B.To increase maximum hardness and tensile strength to peak levels
C.To transform ferrite into soft pure iron
D.To form a corrosion-resistant oxide layer on the outer surface
Explanation: Quenched martensitic steel is extremely hard, brittle, and contains severe internal stresses. Tempering involves reheating the hardened steel to a temperature below its lower critical limit (e.g., 200°C–650°C), which relieves internal stresses, decreases brittleness, and improves impact toughness and ductility at the cost of a slight reduction in peak hardness.
10Which case-hardening method involves heating low-carbon steel in a carbonaceous gas or solid medium to diffuse carbon into the surface layer?
A.Carburizing
B.Anodizing
C.Alodining
D.Spheroidizing
Explanation: Carburizing is a case-hardening process where low-carbon steel parts are heated in contact with a carbon-rich environment (gas, liquid salt, or solid charcoal/pack). Carbon diffuses into the outer surface, producing a high-carbon outer layer ('case') that can subsequently be quenched to form hard martensite while maintaining a tough low-carbon core.
About the Module 6 Materials & Hardware Exam
UK CAA Part-66 Module 6 covers aircraft structural materials, heat treatment, composite repair, corrosion, fasteners, and mechanical hardware for AME candidates. Exam includes 72 MCQs with a 75% pass mark.
Exam sponsor: UK Civil Aviation Authority (CAA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
72 questions
Time Limit
90 minutes
Passing Score
75%
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Official sources
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
50%
Core Knowledge & Regulations
Fundamental principles, laws, and operating requirements.
50%
Applied Systems & Calculations
Practical application, calculations, and maintenance procedures.
Preparing for the Module 6 Materials & Hardware Exam
What You Need to Know
- Passing score: 75%
- Exam length: 72 questions
- Time limit: 90 minutes
- Exam / certification fees: £75 Official sources
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Module 6 Materials & Hardware: Suggested Study Strategy
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Frequently Asked Questions
What is the pass mark for Module 6 Materials & Hardware?
The pass mark required by the UK CAA is 75%.