FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Dents in the heel of a bend are not permissible in a hydraulic tube, but are acceptable in the remainder of the tube if they do not exceed what percent of the tube diameter?

  1. 10%

  2. 15%

  3. 20%

  4. 25%

The correct answer is: 20%

A dents in the heel of a bend can create weak points in a hydraulic tube that can lead to failure under pressure. This is why they are not permissible. However, small dents in the remainder of the tube may still be acceptable. If these dents do not exceed 20% of the tube diameter, they should not significantly compromise the strength and functionality of the tube. Options A, B, and D are incorrect because they either suggest a higher or lower percent of acceptable dents in the remainder of the tube, which may pose a greater risk of failure.

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