---
title: "CS 23.2265 Special factors of safety — CS-23 · Avioverse"
description: "The applicant must determine a special factor of safety for each critical design value for each part, article, or assembly for which that critical design…"
url: "https://avioverse.aero/regulations/easa/cs-23/subpart-c/cs-23-2265"
---

# CS 23.2265 Special factors of safety

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

IR Implementing rule

## CS 23.2265 Special factors of safety

(a) The applicant must determine a special factor of safety for each critical design value for each part, article, or assembly for which that critical design value is uncertain, and for each part, article, or assembly that is:

(1) likely to deteriorate in service before normal replacement; or

(2) subject to appreciable variability because of uncertainties in manufacturing processes or inspection methods.

(b) The applicant must determine a special factor of safety using quality controls and specifications that account for each:

(1) type of application;

(2) inspection method;

(3) structural test requirement;

(4) sampling percentage; and

(5) process and material control.

(c) The applicant must multiply the highest pertinent special factor of safety in the design for each part of the structure by each limit load and ultimate load, or ultimate load only, if there is no corresponding limit load, such as occurs with emergency condition loading.

IR · CS 23.2265 — CS-23 · ED Decision 2017/013/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMC Acceptable means of compliance

## AMC1 23.2265 Special factors of safety

ASTM F44 F3264 Standard Specification for Normal Category Aeroplanes Certification

6.14 Special Factors of Safety

F3061/F3061M-24a Standard Specification for Systems and Equipment in Small Aircraft F3114-21 Standard Specification for Structures

F3380-19 Standard Practice for Structural Compliance of Very Light Aeroplanes

\[AMC & GM to CS-23: Issue 4]

\[AMC & GM to CS-23: Issue 5]

AMC · AMC1 23.2265 — CS-23 · ED Decision 2026/003/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMC Acceptable means of compliance

## AMC2 23.2265 Special factors of safety

CS-23 Amdt 4

23.619 Special factors

23.621 Casting factors

23.623 Bearing factors

23.625 Fitting factors

23.657 Hinges

23.681(b) Limit load static tests - Control System

23.693 Joints

23.785 Seats, berths, litters, safety belts, and shoulder harnesses

AMC · AMC2 23.2265 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

AMC Acceptable means of compliance

## AMC3 23.2265 Special factors of safety

CS VLA Amdt 1

VLA.619 Special factors

VLA.621 Casting factors

VLA.623 Bearing factors

VLA.625 Fitting factors

VLA.657 Hinges

VLA.681 Limit load static tests - Control System

VLA.693 Joints

VLA.785 Seats, safety belts, and harnesses

AMC · AMC3 23.2265 — CS-23 · ED Decision 2017/025/R · CS-23 Easy Access Rules · EAR revision 13 May 2026

[All rules in SUBPART C — STRUCTURES](https://avioverse.aero/regulations/easa/cs-23/subpart-c)

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.