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Normal-Category Aeroplanes (CS-23) · CS-23 · EAR revision 13 May 2026
IRImplementing rule
Aeroplanes intended for operations on water must:
(a)provide buoyancy of 80 % in excess of the buoyancy required to support the maximum weight of the aeroplane in fresh water; and
(b)have sufficient margin so that the aeroplane will stay afloat at rest in calm water without capsizing in case of a likely float or hull flooding.
IR · CS 23.2310 — 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
7.3 Buoyancy for Seaplanes and Amphibians F3061/F3061M-24a Standard Specification for Systems and Equipment in Small Aircraft [AMC & GM to CS-23: Issue 4] [AMC & GM to CS-23: Issue 5]
AMC · AMC1 23.2310 — 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
23.751 Main float buoyancy
23.755 Hulls
23.757 Auxiliary floats
AMC · AMC2 23.2310 — 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.751 Main float buoyancy VLA.757 Auxiliary floats
AMC · AMC3 23.2310 — 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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