Stress Engineer – Aircraft Interior Modifications

Indotronix Avani UK; Frimley; Hybrid; GBP 70,000 - 95,000; Full time

Job summary

Indotronix Avani UK is seeking a (Mechanical) Stress Engineer – Aircraft Modifications in Frimley to support certification and delivery of aircraft modification programmes. The role focuses on substantiation and certification for interior modifications and ensuring compliance with airworthiness requirements.

You will deliver stress analyses, hand calculations, FEA models, and certification evidence packages, collaborating with global engineering teams and stakeholders to meet tight programme

Qualifications

• Degree qualified in Aerospace, Aeronautical, Mechanical Engineering, or a related discipline.
• Significant experience in aircraft stress analysis, structural engineering, or aircraft modification substantiation.
• Strong knowledge of aircraft structures, load paths, structural interfaces, and certification requirements.
• Experience supporting aircraft interior modification programmes and cabin reconfiguration projects.
• Proficiency in classical stress analysis techniques and engineering hand calculations.
• Experience producing certification-ready structural substantiation reports and technical documentation.
• Proficient in Finite Element Analysis (FEA) and associated modelling tools.
• Working knowledge of EASA and FAA airworthiness regulations, including CS-25 and FAR 25 requirements.
• Experience within an EASA Part 21J Design Organisation environment is highly desirable.
• Strong technical report writing, problem-solving, and analytical skills.
• Ability to manage multiple workstreams and deliver to demanding programme schedules.
• Excellent communication and stakeholder management skills.

Responsibilities

• Deliver structural substantiation and certification activities for aircraft interior modification programmes.
• Develop and author certification-ready stress analysis and substantiation documentation supporting aircraft modifications.
• Perform detailed stress calculations, structural assessments, load path analysis, and engineering justifications to demonstrate compliance with airworthiness requirements.
• Support certification of cabin interior modifications including seating installations, monuments, galleys, lavatories, class dividers, premium cabin suites, PSUs, LRUs, and cabin reconfiguration activities.
• Assess structural interfaces between aircraft interiors and primary or secondary aircraft structures where required.
• Produce hand calculations, Finite Element Analysis (FEA) models, stress reports, compliance documentation, and certification evidence packages.
• Support technical reviews, design reviews, certification meetings, and customer-facing engineering discussions.
• Ensure all engineering documentation remains accurate, traceable, auditable, and compliant with company procedures and regulatory requirements.
• Collaborate with multidisciplinary engineering teams across multiple programmes and international locations.
• Promote engineering excellence, quality, safety, and continuous improvement throughout project delivery.

Skills

Aircraft stress analysis

FEA modelling

Hand calculations

Certification reports

EASA/FAA regs

Cabin interior mods

Interdisciplinary teamwork

Technical report writing

Stakeholder management

Project multitasking

Education

Degree in Aerospace/Mechanical Engineering

Tools

FEA software

CAx tools

Job description

Indotronix Avani UK is seeking a (Mechanical) Stress Engineer – Aircraft Modifications in Frimley to support certification and delivery of aircraft modification programmes. The role focuses on substantiation and certification for interior modifications and ensuring compliance with airworthiness requirements.

You will deliver stress analyses, hand calculations, FEA models, and certification evidence packages, collaborating with global engineering teams and stakeholders to meet tight programme