CS-E 25  Instructions for Continued Airworthiness

ED Decision 2007/015/R

(See AMC E 25)

(a)     In accordance with 21.A.61(a), manual(s) must be established containing instructions for continued airworthiness of the Engine. They must be updated as necessary according to changes to existing instructions or changes in Engine definition.

(b)     The instructions for continued airworthiness must contain a section titled airworthiness limitations that is segregated and clearly distinguishable from the rest of the document(s).

For Engine Critical Parts, this section must also include any mandatory action or limitation for inservice maintenance and repair identified in the Service Management Plan required under CS-E 515.

(1)     For all Engines, the airworthiness limitations section must set forth each mandatory replacement time, inspection interval and related procedure required for type certification.

(2)     For Engines having 30-Second OEI and 2-Minute OEI power ratings, in addition to complying with CS-E 25(b)(1), the airworthiness limitations section must also prescribe the mandatory postflight inspections and maintenance actions associated with any use of either the rated 30-Second OEI or 2-Minute OEI Power. The adequacy of these inspections and maintenance actions must be validated and an in-service Engine evaluation programme must be established to assure the adequacy of the data of CS-E 20(f) pertaining to power availability and the instructions for the mandatory post flight inspections and maintenance actions.

The programme must include service Engine tests or equivalent service Engine test experience on Engines of similar design and/or evaluations of service usage of the 30-Second / 2-Minute OEI ratings.

(c)      The following information must be considered, as appropriate, for inclusion into the manual(s) required by CS-E 25(a).

(1)     A detailed description of the Engine and its components, systems and installations.

(2)     Handling instructions, including proper procedures for uncrating, de inhibiting, acceptance checking, lifting and attaching accessories, with any necessary checks.

(3)     Basic control and operating information describing how the Engine components, systems and installations operate. Information describing the methods of starting, running, testing and stopping the Engine or its components and systems including any special procedures and limitations that apply.

(4)     Servicing information that covers details regarding servicing points, capacities of tanks, reservoirs, types of fluids to be used, pressures applicable to the various systems, locations of lubrication points, lubricants to be used and equipment required for servicing.

(5)     Scheduling information for each part of the Engine that provides the recommended periods at which it should be cleaned, inspected, adjusted, tested and lubricated, and the degree of inspection, the applicable serviceability limits, and work recommended at these periods. Necessary crossreferences to the airworthiness limitations section must also be included. In addition, if appropriate, an inspection programme must be included that states the frequency of the inspections necessary to provide for the continued airworthiness of the Engine.

(6)     Troubleshooting information describing probable malfunctions, how to recognise those malfunctions and the remedial action for those malfunctions.

(7)     Information describing the order and method of removing the Engine and its parts and replacing parts, the order and method of disassembly and assembly, with any necessary precautions to be taken. Instructions for proper ground handling, crating and shipping must also be included.

(8)     Cleaning and inspection instructions that cover the material and apparatus to be used and methods and precautions to be taken. Methods of inspection must also be included.

(9)     Details of repair methods for worn or otherwise non-serviceable parts and components along with the information necessary to determine when replacement is necessary. Details of all relevant fits and clearances.

(10)    Instructions for testing including test equipment and instrumentation.

(11)    Instructions for storage preparation, including any storage limits.

(12)    A list of the tools and equipment necessary for maintenance and directions as to their method of use.

[Amdt. No.: E/1]