---
title: "CS 25.967 Fuel tank installations — CS-25 · Avioverse"
description: "(See AMC 25.967) (a) Each fuel tank must be supported so that tank loads (resulting from the weight of the fuel in the tanks) are not concentrated on…"
url: "https://avioverse.aero/regulations/easa/cs-25/subpart-e/cs-25-967"
---

# CS 25.967 Fuel tank installations

Large Aeroplanes (CS-25) · CS-25 · EAR revision 26 Jan 2023

IR Implementing rule

## CS 25.967 Fuel tank installations

(See AMC 25.967)

(a) Each fuel tank must be supported so that tank loads (resulting from the weight of the fuel in the tanks) are not concentrated on unsupported tank surfaces. In addition –

(1) There must be pads, if necessary, to prevent chafing between the tank and its supports;

(2) Padding must be non-absorbent or treated to prevent the absorption of fluids;

(3) If a flexible tank liner is used, it must be supported so that it is not required to withstand fluid loads (see AMC 25.967(a)(3)); and

(4) Each interior surface of the tank compartment must be smooth and free of projections that could cause wear of the liner unless –

(i) Provisions are made for protection of the liner at these points; or

(ii) That construction of the liner itself provides that protection.

(b) Spaces adjacent to tank surfaces must be ventilated to avoid fume accumulation due to minor leakage. If the tank is in a sealed compartment, ventilation may be limited to drain holes large enough to prevent excessive pressure resulting from altitude changes.

(c) The location of each tank must meet the requirements of CS 25.1185(a).

(d) No engine nacelle skin immediately behind a major air outlet from the engine compartment may act as the wall of an integral tank.

(e) Each fuel tank must be isolated from personnel compartments by a fumeproof and fuelproof enclosure.

\[Amdt 25/18]

IR · CS 25.967 — CS-25 · ED Decision 2016/010/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMC Acceptable means of compliance

## AMC 25.967(a)(3) Fuel tank installation

The installation of a flexible tank and its venting, according to CS 25.975(a)(3) should be such that the tank liner will not be deformed in such a way as to significantly affect the fuel quantity indication.

AMC · AMC 25.967(a)(3) — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

[All rules in SUBPART E – POWERPLANT](https://avioverse.aero/regulations/easa/cs-25/subpart-e)

Consolidated from the EASA Easy Access Rules (revision 26 Jan 2023, 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.