Interiors Stress Engineer in Farnborough, Hampshire

12 Month Contract Hybrid working (circa 2 – 3 days per week on site)

We are seeking an experienced Mechanical Stress Engineer engaged as a contingent worker / contractor to support certification of aircraft modifications. This contract position will primarily deliver structural substantiation documentation for interior modifications and associated interfaces to demonstrate compliance with relevant regulatory and customer requirements and procedures defined in the company's Design Organization Handbook (DOH).

Key Responsibilities:

• Act as a contracted technical resource reporting to the Structures Engineering Manager and collaborating with global engineering teams to identify certification requirements and define substantiating solutions for active and upcoming interior modification programmes.
• Lead and deliver certification activities and structural substantiation documentation to ensure compliance with design and airworthiness requirements.
• Compile, author and critically review structural substantiation documentation including but not limited to:
• Product certification and integration substantiation for new seating installations.
• New monuments and furniture installations (galleys, lavatories, class dividers, first-class suites, VVIP furnishings).
• Cabin interior changes such as LOPAs, Passenger Service Unit (PSU) layouts, LRU installations and other interior reconfiguration items.
• Related primary-structure considerations where applicable (e.g., antenna installations, fuselage cutouts) to the extent they affect interior substantiation.
• Provide detailed calculations, stress reports, load paths and justification that meet regulatory and company DOH expectations.
• Support customer-facing certification meetings (ITCM, PDR, CDR, FAI).
• Ensure documentation is auditable, traceable and structured for regulatory review and customer approval.
• Promote a culture of safety, quality and continuous improvement within the engineering organization while operating in a contingent worker capacity.

Deliverables:

• Complete structural substantiation reports for interior modifications consistent with DOH templates and certification plan.
• Hand calculation packages and Finite Element Analysis (FEA) models and results.
• Certification compliance matrices, load cases and assumptions records.

Key Attributes:

• Expert knowledge of EASA CS-25 Subpart C Structures certification requirements, applied to the certification and integration of cabin interior monuments.
• Expert knowledge of testing of cabin interior monuments.
• Technical writing of compliance documents.
• Recent experience working with an EASA Part 21J Design Organisation (or equivalent) is highly desirable.
• Substantial knowledge of aircraft interior modification practices, installations and interfaces; familiarity with primary and secondary aircraft structures related to interior modifications.
• Proficient with hand calculations using classical stress analysis techniques and able to justify assumptions clearly.
• Proficient in Finite Element Analysis (FEA) tools and able to produce traceable models and results.
• Strong technical report writing skills with experience producing certification-ready substantiation packages.
• Working knowledge of EASA and FAA airworthiness requirements relevant to stress/structures (e.g., CS-25, FAR 25, ETSO/JTSO where applicable).
• High attention to detail, professional integrity and ability to work to contractual schedules.
• Ability to manage multiple programmes concurrently, prioritise workloads and adapt to changing project demands.
• Excellent communication skills for technical engagement with internal and external stakeholders.

Qualifications:

• Bachelor's Degree in Aerospace, Aeronautical or Mechanical Engineering (or equivalent).
• Minimum of five years' relevant experience in aircraft structures / stress, with demonstrable recent experience in modification substantiation (preferably interiors).