In this condition, less power is demanded of the engine (it is throttled back) so it is developing much less heat.
As metals expand and contract under temperature changes, dimensional changes in the engine may exceed tolerance limits.
[2] While the subject is very controversial, some believe shock cooling, as commonly explained, is nothing but a myth.
Doubts have been raised regarding the plausibility of achieving the temperature reduction in cylinder heads during flight that is purported to cause damage in most engines.
[4] Complicating the analysis[citation needed], high operating temperatures in of themselves, can contribute to excessive component wear and damage, which is typically associated with "shock cooling".