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Normal-Category Aeroplanes (CS-23) · CS-23 · EAR revision 13 May 2026
IRImplementing rule
There must be means to isolate and mitigate hazards to the aeroplane in the event of a powerplant system fire or overheat in operation.
IR · CS 23.2440 — CS-23 · ED Decision 2017/013/R · CS-23 Easy Access Rules · EAR revision 13 May 2026
AMCAcceptable means of compliance
ASTM F44 F3264 Standard Specification for Normal Category Aeroplanes Certification
8.9 Powerplant Installation Fire Protection F3061/F3061M-24a Standard Specification for Systems and Equipment in Small Aircraft F3062/F3062M-20 Standard Specification for Aircraft Powerplant Installation F3063/F3063M-21 Standard Specification for Aircraft Fuel Storage and Delivery F3064/F3064M-21 Standard Specification for Aircraft Powerplant Control, Operation, and Indication F3066/F3066M-18 Standard Specification for Aircraft Powerplant Installation Hazard Mitigation
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 23.2440 — CS-23 · ED Decision 2026/003/R · CS-23 Easy Access Rules · EAR revision 13 May 2026
AMCAcceptable means of compliance
CS-23 Amdt 4
23.995 Fuel valves and controls
23.1103(e), (f) Induction system ducts
23.1141(f) Powerplant controls: general
23.1181 Designated fire zones: regions included
23.1182 Nacelle areas behind firewalls
23.1183 Lines, fittings, and components
23.1189 Shutoff means
23.1191 Firewalls
23.1192 Engine accessory compartment diaphragm
23.1193 Cowling and nacelle
23.1195 Fire extinguishing systems
23.1197 Fire extinguishing agents
23.1201 Fire extinguishing system materials
23.1203(a), (e) Fire detector system
23.1435(c) Hydraulic Systems
AMC · AMC2 23.2440 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026
AMCAcceptable means of compliance
CS VLA Amdt 1 VLA.995 Fuel valves and controls VLA.1103 Induction system ducts VLA.1141 Powerplant controls and accessories: general VLA.1182 Nacelle areas behind firewalls VLA.1183 Lines, fittings, and components VLA.1191 Firewalls VLA.1193 Cowling and nacelle
AMC · AMC3 23.2440 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026
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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