Engine Pressure Ratio(EPR)
Definition
The ratio of turbine discharge pressure to compressor inlet pressure, used as a thrust indication on some turbofan engines. EPR directly relates to the thrust the engine is producing.
Why Engine Pressure Ratio Matters for Pilots
Understanding Engine Pressure Ratio is important for pilot certification exams and safe flight operations. This concept appears on FAA and EASA knowledge tests, and examiners may ask about it during oral checkrides. A thorough understanding of Engine Pressure Ratio helps you make better decisions in the cockpit.
Exam Tip
This concept is commonly tested in engines-related questions on FAA and EASA exams. Make sure you can explain Engine Pressure Ratio in your own words for the oral exam. Practice applying this concept to real-world scenarios, not just memorizing the definition.
Related Terms
Share this with a fellow pilot
Related Content
Radial
Aviation glossary definition and exam tips.
Stall
Aviation glossary definition and exam tips.
Metar
Aviation glossary definition and exam tips.
ATPL Theory Complete Guide
Master every subject covered in airline pilot exams.
Free Practice Exam
Test your aviation knowledge with real exam questions.
Built by a commercial pilot
Pass your written for $39 — every track, 60 days
Engine Pressure Ratio is one of 5,500+ exam topics in the All-5 Bundle: PPL / IR / CPL / ATPL / Part 107 / TAE. One-time payment, no subscription. Free 30-day extension if you fail your real exam.
Test your knowledge
Think you understand Engine Pressure Ratio? Challenge yourself with practice questions covering engines and all other exam subjects.
Try Free Practice QuestionsMore Engines Terms
Turbofan Engine
A gas turbine engine where a large fan driven by the turbine section produces mo...
Turboprop Engine
A gas turbine engine that drives a propeller through a reduction gearbox. Turbop...
Turbojet Engine
The simplest form of gas turbine jet engine where all thrust comes from the exha...
Piston Engine
A reciprocating internal combustion engine driving a propeller for aircraft prop...
Would you pass the real exam right now?
Take a free practice quiz — real FAA-style questions, instant score. No signup to start.
Take the free quiz →