Random Aeronautical Term
ADI (antidetonation injection) system
A system used with some large reciprocating engines in which a mixture of water and alcohol is sprayed into the engine with the fuel when operating at extremely high power. The air/fuel mixture is leaned to allow the engine to develop its maximum power, and the ADI fluid absorbs excessive heat when it vaporizes.
[Source: FAA-H-8083-30B AMT Powerplant Handbook]
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