Describe a recent project where you had to select composite materials for an aircraft structure. How did you ensure the material met both strength and weight requirements?
This question assesses your practical understanding of aerospace materials, design trade-offs, and familiarity with certification standards like CAAS or FAA for a junior A&P role in Singapore’s growing MRO hub.
How to answer
- Briefly state the project scope (e.g., secondary flight-control panel, access door)
- Explain the material selection criteria: specific strength/stiffness, fatigue life, flame-smoke-toxicity, cost, repairability
- Mention the analytical tools used (e.g., CATIA, NASTRAN, CES EduPack) and test coupons you helped fabricate or inspect
- Show awareness of certification: reference AC 20-107B or EASA AMC 20-29; describe witnessing at least one ASTM or Boeing BSS test
- Quantify the outcome: % weight saved vs. baseline Al alloy, margin of safety achieved, any STC or airline acceptance milestone
What not to say
- Listing only generic properties without connecting them to aircraft loads or environment
- Ignoring regulatory requirements or saying 'the senior engineer handled certification'
- Failing to mention hands-on tasks such as lay-up, vacuum bagging, NDT or repair procedure
- Using classified data—instead anonymise or scale numbers appropriately
Sample answer
“On my final-year internship at ST Engineering Aerospace, I helped redesign a carbon-fiber access panel for the A320. Using CES EduPack, I down-selected an epoxy/Cytec T300 prepreg that offered 20% higher specific stiffness than 2024-T3. I produced 20 test coupons, witnessed three-point-bend tests per BSS 7260, and co-wrote the CMH-17 test report. Our panel passed 4-g ultimate load with an MoS of 1.15 and saved 0.8 kg per shipset. The data pack is now part of an STC application under CAAS Part 21J review.”
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