Materials & Hardware

Stress, strain and Young's modulus; the tensile test, hardness, ductility and toughness; fatigue and creep.

Carbon and alloy steels, stainless steels, heat treatment and identification.

Aluminium, titanium, magnesium, copper and nickel alloys, age hardening and their aircraft uses.

Fibres and matrices, fibre orientation and sandwich structure, and identifying the common composites and transparencies.

Detecting and repairing composite damage, wooden structure, and doped fabric covering. Category B2 does not sit these sub-sections.

The electrochemical process, forms of corrosion, the galvanic series, prevention and treatment.

Screw threads, aircraft bolts, studs, screws and nuts, grip length, and torque loading.

Split pins, lockwire, self-locking nuts, tab washers, circlips and keys, positive and friction locking.

Solid and blind rivets, alloy codes and ice-box rivets, sizing and edge distance, defects and removal.

Rigid pipes and flexible hoses, identification, 37° flared and flareless unions, and installation rules.

Spring types and spring rate; plain and rolling-element bearings, load types, fit and failure modes.

Gear types and gear ratios; steel-wire control cables, turnbuckles, pulleys and tensioning.

Aircraft wire and AWG, circuit protection sized to the wire, crimped terminations, connectors and screening.

Timed EASA-style Category A paper across all twelve sub-sections, 52 questions in 65 minutes, 75% to pass.