--- title: "SUBPART C — PISTON ENGINES, TYPE SUBSTANTIATION — CS-E — rule index · Avioverse" description: "SUBPART C — PISTON ENGINES, TYPE SUBSTANTIATION (22 paragraphs), CS-E. Coolant Flow. (Applicable to liquid-cooled Engines only). Equipment must be…" url: "https://avioverse.aero/regulations/easa/cs-e/subpart-c" --- # SUBPART C — PISTON ENGINES, TYPE SUBSTANTIATION Engines (CS-E) · CS-E 1. ## [CS-E 300 Conditions Applicable to All Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-300-conditions-applicable-to-all-tests) Coolant Flow. (Applicable to liquid-cooled Engines only). Equipment must be provided to permit simultaneous observation of the coolant flow to each bank… 2. ## [AMC E 300(f) Conditions Applicable to all Tests - Torque Measurement](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-300-f-conditions-applicable-to-all-tests-torque-measurement) In establishing an acceptable method for determination of the Engine torque, consideration should be given to the following: 3. ## [CS-E 320 Performance Correction](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-320-performance-correction) (See AMC E 320) (a) All performance results shall be corrected to the conditions of the Standard Atmosphere, in accordance with an internationally… 4. ## [AMC E 320 Performance Correction](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-320-performance-correction) An acceptable method for calculating performance corrections is defined in ISO 1585:2020, Road vehicles - Engine test code - Net power. 5. ## [CS-E 330 Tests - General](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-330-tests-general) A single Engine must be used for all the tests except that, if so desired, the vibration, calibration, and detonation tests may be made on Engines of the… 6. ## [CS-E 340 Vibration Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-340-vibration-tests) (See AMC E 340) (a) Tests by approved methods must be made on an appropriate mounting to satisfy the Agency that no dangerous torsional or flexural… 7. ## [AMC E 340 Vibration Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-340-vibration-tests) Calculations during design of the Engine During the design stage the applicant should make calculations to determine the vibration characteristics of the… 8. ## [CS-E 350 Calibration Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-350-calibration-tests) (See AMC E 350) (a) The power characteristics of the Engine must be established, under all normal operating conditions within the declared flight… 9. ## [AMC E 350 Calibration Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-350-calibration-tests) In complying with CS-E 350(a), the following calibration testing should normally be considered adequate. 10. ## [CS-E 360 Detonation Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-360-detonation-tests) For spark ignition Engines: A test shall be conducted to demonstrate that the Engine can function without detonation at all operating conditions within… 11. ## [CS-E 370 Starting Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-370-starting-tests) At least 100 successful Engine starts must be made, either during or at the end of the endurance test of CS-E 440, using the normal means of starting and… 12. ## [CS-E 380 Low Temperature Starting Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-380-low-temperature-starting-tests) (see AMC E 380) (a) Tests shall be carried out to demonstrate that the Engine can be started under the lowest temperature conditions to be approved… 13. ## [AMC E 380 Low Temperature Starting Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-380-low-temperature-starting-tests) The minimum tropical and temperate sea-level temperature as defined in CS-Definitions is -20°C. 14. ## [CS-E 390 Acceleration Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-390-acceleration-tests) The tests of CS-E 390(a)(1) and (2) must be carried out at the end of the endurance test of CS-E 440 without heated intake air and repeated, when… 15. ## [CS-E 400 Over-speed Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-400-over-speed-tests) The tests of (1) and (2) shall be completed during or at the end of the endurance test of CS-E 440. 16. ## [CS-E 430 Water Spray Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-430-water-spray-tests) Installation Conditions. With the Engine suitably cowled or shielded to be fully representative of an installed Engine, a water spray must be applied… 17. ## [CS-E 440 Endurance Test](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-440-endurance-test) The test must be made in the order defined in the appropriate schedule and in suitable non-stop parts. 18. ## [AMC E 440(b)(4) Endurance Test — Schedule for Engine Incorporating a Turbocharger](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-440-b-4-endurance-test-schedule-for-engine-incorporating-a-turbocharger) Altitude testing may be simulated provided it is shown that the Engine and turbocharger are being subjected to mechanical loads and operation… 19. ## [CS-E 450 Ignition Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-450-ignition-tests) For spark-ignition Engines: If the design of the ignition system includes redundancy, the reduction in Engine power resulting from loss of redundancy… 20. ## [CS-E 460 Backfire Tests](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-460-backfire-tests) For spark ignition Engines: After completion of the endurance test of CS-E 440, functioning tests of the Engine shall be made to determine if there is… 21. ## [CS-E 470 Contaminated Fuel](https://avioverse.aero/regulations/easa/cs-e/subpart-c/cs-e-470-contaminated-fuel) (See AMC E 470) Evidence shall be provided that the complete Engine fuel system is capable of operating without Engine malfunctioning under any likely… 22. ## [AMC E 470 Contaminated Fuel](https://avioverse.aero/regulations/easa/cs-e/subpart-c/amc-e-470-contaminated-fuel) In complying with CS-E 470, the following contaminant specifications and levels are considered acceptable: Consolidated from the EASA Easy Access Rules (revision 7 Dec 2023, extracted 13 Oct 2026) for convenience. 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