FAA AMT Airframe Test 2025 – 400 Free Practice Questions to Pass the Exam

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Which of the following provide an acceptable protective coating when dope proofing aircraft structure parts in contact with doped fabric?

Varnish and Wax

Aluminum Foil and Cellulose Tape

When dope proofing aircraft structure parts in contact with doped fabric, it is crucial to choose a protective coating that will not react negatively with the chemicals in the dope or damage the fabric. Aluminum foil and cellulose tape provide an acceptable protective coating in this scenario.

Aluminum foil creates a barrier between the doped fabric and the structure parts, preventing any potential reactions. Cellulose tape is used to secure the foil in place and provide additional protection. This combination ensures that the aircraft structure parts remain protected while in contact with doped fabric during the dope proofing process.

The other options are incorrect because varnish and wax (Option A) may not provide sufficient protection against the chemicals present in the dope, paint and vinyl (Option C) are not ideal for this specific purpose, and rubber coating and plastic film (Option D) may react negatively with the dope or damage the fabric.

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Paint and Vinyl

Rubber coating and Plastic film

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