Final answer:
Engine maintenance manuals provide specific requirements for cleaning, inspection, protection, maintenance, and depreservation of auxiliary power units, gas turbine engines, and reciprocating engines.
Step-by-step explanation:
The specific requirements for the cleaning, inspection, protection, maintenance, and depreservation of auxiliary power units, gas turbine engines, and reciprocating engines are addressed in engine maintenance manuals provided by the manufacturers. These manuals contain detailed instructions and guidelines on how to properly clean, inspect, protect, and maintain the engines. For example, they may specify the use of specific cleaning agents, inspection procedures, protective coatings, and maintenance intervals.
Engine maintenance manuals also provide guidance on proper depreservation procedures for engines that have been inactive for a certain period of time. This includes steps to protect the engine from corrosion and other forms of damage during storage or extended periods of non-use.