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without damage to the engine.
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That is an entry in a Squadron logbook. The man who wrote that is not a technical expert in engines. He is an operator not an engineer.
The engineers clearly disagree with this operator in the instruction under entry number 11 for AP 1590B/J.2-W Merlin II and III Use of +12lbs Boost Pressure - Alterations and Precautions.
Paragraph 11 clearly states:
The use, in an emergency, of this high boost pressure is a definite overload condition on the engine....