EASA Module 14 study guide
EASA Module 14 · Work through your exam, one topic at a time.
Module 14, Propulsion, is one of the Part-66 aircraft maintenance licence knowledge modules listed in the Annex III appendix to Commission Regulation (EU) No 1321/2014, the regulation that sets out continuing airworthiness requirements including maintenance personnel training and licensing. It is aimed at candidates working toward a Part-66 licence, typically through a Part-147 training organisation or by self-study followed by examination at a competent authority. The module is delivered in English as multiple-choice questions across four subject areas: turbine engines, piston engines, engine systems and components, and propellers. Content spans engine construction and operating principles, ignition, starting, fuel, lubrication, cooling, indicating and control systems, plus propeller theory, construction, control and synchronising. The EASA Module 14 study guide has 4 sections and about 1,882 words.
01Turbine Engines
Domain 14.1 of EASA Module 14 examines the gas turbine as a machine: the cycle it runs, how it is built as modules, and how thrust is produced, measured and limited. Questions are usually quantitative or diagnostic - a thrust calculation, a stall/surge scenario, or a question on why bleed valves open at low power.
531 words, about 3 min02Piston Engines
Domain 14.2 covers the reciprocating engine as fitted to light aircraft: the four-stroke cycle, layout and valve train, mixture formation and ignition, and the abnormal combustion modes that destroy engines. Expect compression-ratio and displacement arithmetic alongside detonation/pre-ignition discrimination.
456 words, about 2 min03Engine Systems and Components
Domain 14.3 tests the supporting systems that let an engine start, run, stay cool and stop safely: fuel, oil, ignition and starting, air, indication, FADEC and thrust reversers. Questions are usually about sequence, redundancy, and what happens when a component fails.
428 words, about 2 min04Propellers
Domain 14.4 examines how a propeller converts shaft power into thrust, how blade angle is controlled, and how feathering, reversing and vibration control are achieved. Expect pitch and advance-ratio arithmetic alongside governor logic questions.
467 words, about 2 min