Structures Repair Exam Practice Test

FAA Repairman Certificate – Composite Structures Repair Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary advantage of composite materials in aircraft

structures?

• They are easier to machine
• They provide high strength-to-weight ratio
• They are less expensive than metals
• They require no maintenance

Rationale: Composite materials provide a higher strength-to-weight

ratio compared to metals, allowing for lighter and stronger structures.

• What is the primary structural component in a carbon fiber

composite? 1 / 4

• Resin
• Carbon fibers
• Kevlar weave
• Epoxy filler

Rationale: Carbon fibers provide the primary load-carrying strength

in carbon fiber composites, while resin bonds the fibers.

• Which type of resin is most commonly used in aircraft composite

structures?

• Polyester
• Epoxy
• Vinyl ester
• Phenolic

Rationale: Epoxy resins are preferred for aerospace composites due

to their superior mechanical strength and environmental resistance.

• What is the function of the matrix in a composite material?
• To absorb loads
• To provide electrical conductivity
• To bind and transfer loads between fibers
• To make the structure flexible

Rationale: The matrix (resin) binds fibers together and transfers

loads between them while protecting from environmental damage.

• What is a common cause of delamination in composite structures?
• Overweight materials 2 / 4

• Impact damage or poor bonding
• Incorrect paint finish
• Over-curing

Rationale: Delamination often results from impact or improper

bonding during manufacture or repair.

• What is the term for the direction in which most fibers are aligned in a

composite?

• Radial direction
• Primary fiber direction
• Isotropic direction
• Perpendicular axis

Rationale: The primary fiber direction is the orientation in which

fibers carry the main load.

• Which of the following best describes anisotropic behavior in

composites?

• Same properties in all directions
• Different properties in different directions
• Magnetic behavior
• Nonconductive behavior

Rationale: Composites are anisotropic because their strength and

stiffness vary with fiber orientation.

• What is used to remove air and compact laminates during vacuum

bagging? 3 / 4

• Nylon cloth
• Peel ply
• Breather and vacuum pressure
• Release film only

Rationale: The breather allows air removal and pressure distribution

under vacuum, compacting the laminate.

• What is the purpose of peel ply in composite layups?
• Strengthen the laminate
• Create a clean, textured surface for bonding
• Provide extra insulation
• Prevent resin flow

Rationale: Peel ply provides a textured surface for secondary bonding

after removal.

• What is the most common damage detection method for

composite delamination?

• Visual inspection
• Tap test
• Ultrasonic bond test
• Thermal imaging

Rationale: A tap test produces a dull sound in delaminated areas, a

quick and simple detection method.

• Which material provides impact resistance in hybrid

composites?

• / 4