If the heat stick does not melt after testing the indicated axle, what does this indicate?

• A. Not overheated and not defective
• B. The axle is malfunctioning
• C. Heat stick faulty
• D. Inspect all adjacent axles

Answer: (A)

Heat sticks show overheating by melting when an axle bearing gets too hot. If the stick does not melt after testing the indicated axle, it means the axle did not reach the melting temperature, so there was no overheating. Assuming the heat stick is in good condition and used correctly, this indicates the axle is not overheated and is not defective. If there were doubt about the heat stick itself, you would replace it and re-test, but the observed result points to normal, non-overheating condition. The other options don’t fit because there’s no evidence of an axle malfunction, a faulty heat stick, or a need to inspect adjacent axles based solely on a non-melting stick.