This volume gives the information about the requirements of aircraft engine maintenance and contains safety precautions, basic procedures, locations and functioning of components. Since the maintenance of aircraft engine is most important and critical, all the materials connected with aircraft engine servicing and maintenance has been taken care as per EASA module 15 and covered up in this book.The book is designed to aid the students and learners in their day to day study. The chapters in this book discussed are about Jet Engine Maintenance.