CS 23.2435 Powerplant installation support systems

Normal-Category Aeroplanes (CS-23) · CS-23 · EAR revision 13 May 2026

IRImplementing rule

CS 23.2435Powerplant installation support systems

(a)Powerplant installation support systems are all systems whose direct purpose is to support the powerplant or the energy storage device in its intended function as part of the powerplant installation.

(b)Powerplant installation support systems that have a direct effect on the engine availability are considered in the engine reliability.

(c)Powerplant installation support systems are designed for the operating conditions applicable to the location of installation.

(d)Systems must be capable of operating under the conditions likely to occur.

(e)System function and characteristics that have an effect on the powerplant installation system performance are established.

(f)Ingestion of likely foreign objects that would be hazardous to the engine is prevented.

(g)The pilot must be aware of the air intake configuration and able to influence it.

(h)Any likely single failures of powerplant installation support systems that result in a critical loss of thrust are mitigated.

IR · CS 23.2435 — CS-23 · ED Decision 2017/013/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMCAcceptable means of compliance

AMC1 23.2435Powerplant installation support systems

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ASTM F44 F3264 Standard Specification for Normal Category Aeroplanes Certification

8.8 Powerplant Induction, Exhaust, and Support Systems F3062/F3062M-20 Standard Specification for Aircraft Powerplant Installation

Remarks ASTM F44 published standards for showing compliance for electric propulsion systems. EASA has not yet accepted F3239-22a; however, EASA would take into consideration applications from applicants that use this standard as the basis for the development of their means of compliance subject to agreement with EASA. [AMC & GM to CS-23: Issue 4] [AMC & GM to CS-23: Issue 5]

AMC · AMC1 23.2435 — CS-23 · ED Decision 2026/003/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMCAcceptable means of compliance

AMC2 23.2435Powerplant installation support systems

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CS-23 Amdt 4

23.1091 Air induction system

23.1101(a) Induction air preheater design

23.1103(a) through (d) Induction system ducts

23.1111(b) Turbine engine bleed air system

23.1121 Exhaust System - General

23.1123 Exhaust system

23.1125 Exhaust heat exchangers

Remarks Provisions of AMC2 cover only induction and exhaust systems

AMC · AMC2 23.2435 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMCAcceptable means of compliance

AMC3 23.2435Powerplant installation support systems

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CS VLA Amdt 1 VLA.1091 Air induction VLA.1101 Carburettor air preheater design VLA.1103 Induction system ducts VLA.1121 Exhaust System - General VLA.1123 Exhaust manifold VLA.1125 Exhaust heat exchangers

Remarks Provisions of AMC3 cover only induction and exhaust systems

AMC · AMC3 23.2435 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

All rules in SUBPART E — POWERPLANT INSTALLATION

Consolidated from the EASA Easy Access Rules (revision 13 May 2026, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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