Aviation Maintenance Technician, Second Class (AMT2) SWE Practice Exam

What is the size of the clear heat shrinkable tubing used with the label near engine hoses?

1-1/4 inch 2 inch 3 inch 2-1/2 inch

Correct Answer:

2-1/2 inch

Explanation:

The size is chosen to give enough coverage for the label while still fitting snugly around the hose after shrinking. When labeling hoses in an engine area, you want a clear tube big enough to fit over the hose and the label and then shrink down to a secure, readable wrap. A 2-1/2 inch final recovered diameter provides that balance for typical engine hoses: large enough to cover the label and a section of hose, yet small enough to shrink tightly and stay in place. Smaller sizes wouldn’t fully cover the label, and a much larger size would not form a tight, secure wrap. The result is a protected, legible label that can withstand heat and fluids in the engine bay.

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