ATPL Aircraft General Knowledge study plan

Draw from memory a labelled diagram of a semi-monocoque fuselage and a stressed-skin wing, marking stringers, frames, spar booms and skin, and state what each member carries.

Explain in writing how bending, shear and torsion loads are distributed in a cantilever wing and why the upper skin is loaded in compression near the root.

Classify the main structural failure modes (fatigue, corrosion, buckling, overload) and match each to one inspection or design countermeasure.

Describe the purpose of fail-safe, safe-life and damage-tolerance design philosophies and give one aircraft structural example of each.

Trace a complete hydraulic system from engine-driven pump to actuator, labelling reservoir, filters, accumulators, relief valve, selector valve and return line, and state the function of each.

Compare open-centre and closed-centre hydraulic systems and explain how each behaves when the selector is in neutral and when demand exceeds pump output.

Explain the operation of a hydraulic accumulator and calculate how system pressure behaves during a high transient demand.

List the failure indications of a hydraulic system (pressure drop, fluid loss, pump overheating) and state the immediate crew action for each.

Describe the four-stroke piston cycle and explain valve timing, ignition timing and the effect of mixture strength on power and detonation margin.

Explain the operation of a constant-speed propeller and how the governor, oil pressure and centrifugal twisting moment interact to hold rpm.

Distinguish the causes and symptoms of detonation and pre-ignition and state the corrective action for each.

Explain how turbocharging and supercharging restore manifold pressure with altitude and why an overboost limit exists.

Sketch a single-spool turbojet and a high-bypass turbofan and label compressor, combustor, turbine, exhaust and bypass duct, stating the pressure and temperature trend through each station.

Explain how thrust is produced and why a turbofan is more efficient at low Mach numbers than a pure turbojet.

Describe the purpose and operation of the fuel control unit, the variable stator vanes and the bleed valves during acceleration and at low rpm.

Explain compressor surge and stall, list their causes, and state the indications and crew response.

Explain the lubrication requirements of a turbine engine and describe how a dry-sump pressure-and-scavenge system meets them.

Trace the fuel path from tank to combustor, labelling boost pump, low-pressure cock, filter, high-pressure pump, fuel control unit and nozzles, and state the function of each.

Interpret the engine indications (EPR, N1, N2, EGT, fuel flow, oil pressure and temperature) and explain what each indicates about engine condition.

Explain fuel grade selection, water contamination and the purpose of fuel heating or anti-icing in the fuel system.

Explain the generation, distribution and protection of DC and AC electrical power, including the function of the battery, generator, bus bar, circuit breaker and reverse-current relay.

Describe how a pressurisation system maintains cabin altitude and differential pressure, and explain the function of the outflow valve, safety valve and pressure controller.

Explain the operation of an air-cycle air conditioning machine and describe how cabin temperature and humidity are controlled.

State the physiological need for supplemental oxygen with altitude and describe the operation of continuous-flow and demand oxygen systems.

Describe the pneumatic, thermal and electrical methods of airframe and engine ice protection and explain how each is controlled.

Explain the operation of the landing gear extension and retraction system, including uplocks, downlocks, sequencing and the emergency extension method.

Describe the fire detection and extinguishing systems for engine and cargo compartments and state the crew actions for a fire warning.

Explain the function of the autopilot modes, the servos and the disengagement logic, and describe the purpose of a yaw damper.

Re-test every domain with timed mixed questions and record the score per domain.

Revisit only the two weakest domains and correct the underlying misunderstanding, not just the answer.

Build a one-page formula and definition sheet covering pressure, thrust, mass flow, load factor and electrical power relationships.

Rehearse the explanation of three systems aloud in under two minutes each, as if briefing a crew.