---
title: "CS 23.2310 Buoyancy for seaplanes and amphibians — CS-23 · Avioverse"
description: "Aeroplanes intended for operations on water must: provide buoyancy of 80 % in excess of the buoyancy required to support the maximum weight of the…"
url: "https://avioverse.aero/regulations/easa/cs-23/subpart-d/cs-23-2310"
---

# CS 23.2310 Buoyancy for seaplanes and amphibians

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

IR Implementing rule

## CS 23.2310 Buoyancy for seaplanes and amphibians

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

AMC Acceptable means of compliance

## AMC1 23.2310 Buoyancy for seaplanes and amphibians

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

AMC Acceptable means of compliance

## AMC2 23.2310 Buoyancy for seaplanes and amphibians

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

AMC Acceptable means of compliance

## AMC3 23.2310 Buoyancy for seaplanes and amphibians

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

[All rules in SUBPART D — DESIGN AND CONSTRUCTION](https://avioverse.aero/regulations/easa/cs-23/subpart-d)

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