Who is responsible for determining that materials used in aircraft maintenance and repair are of the proper type and conform to the appropriate standards?

• A. The pilot
• B. The installing person or agency
• C. The FAA
• D. The manufacturer

Answer: (B)

The person or organization performing the maintenance—the installing person or agency—is responsible for making sure the materials used are the correct type and meet all standards. They must verify that the parts are approved for use on that aircraft, match the required part numbers in the maintenance data, and comply with the applicable airworthiness regulations. The FAA sets the rules and approves parts, and the manufacturer provides parts and instructions, but the on-site responsibility for ensuring proper materials and conformance rests with the installer.