--- title: "26.400 – CS 26.440: SUBPART C — HELICOPTERS (ADDITIONAL AIRWORTHINESS SPECIFICATIONS FOR OPERATIONS, Part-26) — rule index · Avioverse" description: "26.400 – CS 26.440, Regulation (EU) 2015/640. Operators of large helicopters shall ensure that the following extinguishers do not use halon as an…" url: "https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c" --- # SUBPART C — HELICOPTERS ADDITIONAL AIRWORTHINESS SPECIFICATIONS FOR OPERATIONS · Additional Airworthiness Specifications · Regulation (EU) 2015/640 · 26.400 – CS 26.440 On this page 1. ## [26.400 Fire extinguishers](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-400) Operators of large helicopters shall ensure that the following extinguishers do not use halon as an extinguishing agent: [GM1 26.400(b) Fire extinguishers](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-400#gm1-26-400-b) 2. ## [CS 26.400 Fire extinguishers](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-400) Compliance with point 26.400 of Part-26 is demonstrated by complying with the following (see also GM1 26.400(b)): 3. ## [26.405 Cargo compartment fire protection](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-405) For both small and large helicopters equipped with at least one cargo compartment separated from the flight deck, and for which the individual… [GM1 26.405 Cargo compartment fire protection](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-405#gm1-26-405) 4. ## [CS 26.405 Cargo compartment fire protection](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-405) For small helicopters and large helicopters referred to in point 26.405 of Part26, compliance with point 26.405 is demonstrated by providing: 5. ## [26.410 Emergency controls operated underwater](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-410) Operators of small helicopters and large helicopters that are required, in accordance with point CAT.IDE.H.320(a) of Annex IV to Regulation (EU) No… 6. ## [CS 26.410 Emergency controls operated underwater](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-410) Compliance with point 26.410 of Part-26 is demonstrated by complying with CS 27.1555(d)(2) of CS 27 at Amendment 5 or later, or the equivalent, or CS… 7. ## [26.415 Underwater emergency exits](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-415) Operators of small helicopters and large helicopters that are required, in accordance with point CAT.IDE.H.320(a) of Annex IV to Regulation (EU) No… [GM1 26.415(b) Underwater emergency exits](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-415#gm1-26-415-b) [GM1 26.415(c) Underwater emergency exits](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-415#gm1-26-415-c) [GM1 26.415(d) Underwater emergency exits](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-415#gm1-26-415-d) 8. ## [CS 26.415 Underwater emergency exits](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-415) Compliance with point 26.415(a)(1) of Part-26 is demonstrated by complying with CS 27.805(c) and CS 27.807(d)(5) of CS-27 at Amendment 5 or later, or the… 9. ## [26.420 Emergency equipment for flight over water](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-420) Operators of small helicopters and large helicopters that are required to comply with the requirements of point CAT.IDE.H.300 of Annex IV, point… [GM1 26.420(a) Flight over water emergency equipment](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-420#gm1-26-420-a) [GM1 26.420(c) Flight over water emergency equipment](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-420#gm1-26-420-c) 10. ## [CS 26.420 Flight over water emergency equipment](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-420) Compliance with point 26.420(a)(1) of Part-26 is demonstrated by complying with CS 27.1415(b)(2) of CS-27 at Amendment 5 or later, or the equivalent, or… 11. ## [26.425 Provision of substantiated sea conditions](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-425) A holder of a type certificate for a small helicopter or a large helicopter shall ensure that the substantiated sea conditions for capsize resistance and… 12. ## [CS 26.425 Provision of substantiated sea conditions](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-425) Compliance with point 26.425 of Part-26 is demonstrated by complying with CS 27.1587(b)(3) of CS27 at Amendment 5 or later, or the equivalent, or CS… 13. ## [26.430 Resistance of an emergency flotation system to damage](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-430) Operators of small helicopters or large helicopters that have their first individual certificate of airworthiness issued on or after 9 August 2025 and… 14. ## [CS 26.430 Emergency flotation system resistance to damage](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-430) Compliance with point 26.430 of Part-26 is demonstrated by: compliance with CS 27.801(c)(1) of CS-27 at Amendment 5 or later, or the equivalent, or CS… 15. ## [26.431 Determination of the robustness of emergency flotation system designs](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-431) An operator of a small helicopter or a large helicopter that is required, in accordance with point CAT.IDE.H.320(a) of Annex IV to Regulation (EU) No… [GM1 26.431 Determination of the robustness of emergency flotation system designs](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-431#gm1-26-431) 16. ## [CS 26.431 Determination of the robustness of emergency flotation system designs](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-431) Compliance with point 26.431 is demonstrated by carrying out an assessment in accordance with CS 27.801(c)(1) of CS-27 at Amendment 5 or later, or… 17. ## [26.435 Automatic deployment of an emergency flotation system](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-435) Operators of small helicopters that are required, in accordance with point CAT.IDE.H.320(a) of Annex IV to Regulation (EU) No 965/2012, to be designed… [GM1 26.435(b) Automatic deployment of an emergency flotation system](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-435#gm1-26-435-b) 18. ## [CS 26.435 Automatic deployment of an emergency flotation system](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-435) Compliance with point 26.435(a) of Part-26 is demonstrated by complying with CS 27.801(c)(2) of CS-27 at Amendment 5 or later, or the equivalent, or with… 19. ## [26.440 Fuel system crash resistance](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-440) Operators of small helicopters and large helicopters shall ensure that the likelihood of a post-crash fire is minimised as far as practicable in the… [GM1 26.440(a)(2)(iii) Fuel system crash resistance](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-440#gm1-26-440-a-2-iii) [GM1 26.440(a)(4) Fuel system crash resistance](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/26-440#gm1-26-440-a-4) 20. ## [CS 26.440 Fuel system crash resistance](https://avioverse.aero/regulations/easa/additional-airworthiness/additional-airworthiness-specifications-for/subpart-c/cs-26-440) Compliance with point 26.440 of Part26 is demonstrated by complying with: Consolidated from the EASA Easy Access Rules (revision 20 Mar 2026, extracted 13 Oct 2026) for convenience. 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