Which factor most commonly causes exhaust system thermal fatigue cracking, as described in the material?

Which factor most commonly causes exhaust system thermal fatigue cracking, as described in the material?

• A. The drastic temperature change which is encountered at altitude
• B. The high temperatures at which the exhaust gas operates
• C. Improper welding techniques during manufacture
• D. The corrosion of exhaust components

Answer: (B)