SIST EN 4727:2025
(Main)Aerospace series - Standardized passenger seat weight information
Aerospace series - Standardized passenger seat weight information
This document specifies a definition for the different weight information for the weight reporting during the development and the certification phase. Further it is a baseline for a seat weight determination to get comparable seat weights for seat brochures, marketing reasons and the eco efficiency index.
Luft- und Raumfahrt - Standardisierte Sitzgewichtsangaben für Passagiersitze
Dieses Dokument legt eine Definition für die unterschiedlichen Gewichtsangaben für Gewichtsberichte während der Entwicklungs- und Zertifizierungsphase fest. Es ist außerdem eine Basis zur Bestimmung der Sitzgewichte, um vergleichbare Sitzgewichte für Sitzbroschüren, Marketingzwecke und den Eco-Effizienz-Index zu erhalten.
Série aérospatiale - Définition normalisée du poids d’un siège passager
Le présent document spécifie une définition des différentes informations relatives aux poids à communiquer dans les rapports au cours de la phase de développement et de certification. En outre, il constitue une base de référence pour la détermination des poids des sièges afin d'obtenir des poids comparables pour les brochures de sièges, à des fins marketing et pour l'indice d'écoefficacité.
Aeronavtika - Standardizirani podatki o masi potniških sedežev
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Aeronavtika - Standardizirani podatki o masi potniških sedežev
Aerospace series - Standardized passenger seat weight information
Luft- und Raumfahrt - Standardisierte Sitzgewichtsangaben für Passagiersitze
Série aérospatiale - Définition normalisée du poids d’un siège passager
Ta slovenski standard je istoveten z: EN 4727:2025
ICS:
49.095 Oprema za potnike in Passenger and cabin
oprema kabin equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 4727
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 49.095 Supersedes EN 4727:2017
English Version
Aerospace series - Standardized passenger seat weight
information
Série aérospatiale - Définition normalisée du poids Luft- und Raumfahrt - Standardisierte
d'un siège passager Sitzgewichtsangaben für Passagiersitze
This European Standard was approved by CEN on 4 August 2025.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4727:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Abbreviations . 5
5 Requirements . 6
5.1 General. 6
5.2 Catalogue seat weight . 6
5.2.1 Seat categories I through IV . 6
5.2.2 Seat categories V through VI . 8
5.3 Estimated seat weight . 9
5.4 Calculated seat weight . 9
5.5 Actual seat weight empty . 9
5.6 Maximum seat weight loaded . 9
5.7 Certified seat weight . 10
5.8 Seat weight for the eco efficiency index . 10
5.8.1 General. 10
5.8.2 Seat category I and II . 10
5.8.3 Seat category III . 11
5.8.4 Seat category IV . 13
5.8.5 Seat category V and VI . 14
5.9 Seat weight accuracy. 17
6 Template of seat weight lists . 18
Bibliography . 19
European foreword
This document (EN 4727:2025) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2026, and conflicting national standards shall be
withdrawn at the latest by March 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 4727:2017.
This document includes the following significant technical changes with respect to EN 4727:2017:
— new Clause 3 “Terms and definitions” added;
— description added how to estimate the seat weights in 5.3;
— description added how to calculate the seat weights and calculated seat weights to be shown on the
supplier drawings and DDP instead of actual seat weight empty in 5.4;
— definition of actual seat weight empty refined in 5.5;
— seat weight for the eco efficiency index added in 5.8;
— defined seat weight changed into seat weight accuracy in 5.9.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
The weight for cabin equipment is an important topic in the aviation business. The cabin equipment
weight has a direct impact on the payload of the aircraft, operation cost and revenue of the airlines. Due
to the quantity of aircraft seats, seats are one of the major weight drivers in the cabin. At this time, a lot
of seat weights are used without any clear definition, e.g. allowable max. weight, certified weight, defined
weight. For the definition of each customer specific cabin, it is important to get comparable seat weights.
Aircraft seats are very different with regard to seat envelope dimensions and integrated features and
options. For a weight determination and product comparison, it is very helpful to get comparable weight
information based on a standard weight.
In this document, the following verbal forms are used:
— “shall” indicates a requirement;
— “should” indicates a recommendation;
— “may” indicates a permission;
— “can” indicates a possibility or a capability.
1 Scope
This document specifies a definition for the different weight information for the weight reporting during
the development and the certification phase. Further it is a baseline for a seat weight determination to
get comparable seat weights for seat brochures, marketing reasons and the eco efficiency index.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 4912, Aerospace series — ECO efficiency of seats
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Abbreviations
CAD computer aided design
CDR critical design review
DDP declaration of design and performance
DSM decorative sheet material
EEI eco efficiency index
FRM front row monument
IFE in-flight entertainment
IIL installation instructions and limitations
OEM original equipment manufacturer
pax passenger
PCU power control unit
PRM people with reduced mobility
P/N part number
PU polyurethane
SEB seat electronic box
std. standard
5 Requirements
5.1 General
Aircraft seats are highly customized and the final seat weight always depends on the specific customer
requests.
In order to get a weight definition and to cover all needs of the OEMs, airlines and seat suppliers, following
seat weights are specified in this document:
a) catalogue seat weight;
b) estimated seat weight;
c) calculated seat weight;
d) actual seat weight empty;
e) maximum seat weight loaded;
f) maximum certified seat weight;
g) seat weight accuracy.
5.2 Catalogue seat weight
5.2.1 Seat categories I through IV
The catalogue seat weight is a theoretical seat weight, evaluated based on a pre-defined seat
configuration. The catalogue seat weight shall be used for marketing reasons in seat catalogues and seat
brochures. The catalogue weight according to this document ensures the availability of comparable
weight information for the seat models offered on the market.
The catalogue seat weight shall be evaluated for a std. triple and front row triple seat with a seat width of
1 575 mm (62 in) measured from the most inboard to the most outboard point and installed on two
straight seat legs.
Following parts shall be included:
a) primary structure:
1) two seat legs, including two front and two rear fittings;
2) base members/seat track covers between front and rear fittings;
3) baggage bar under all three seat places;
4) beams (front and rear if two beams);
5) seat spreaders;
6) seat pans;
7) seat belt attachments;
b) secondary structure:
1) one fixed armrest structure outboard;
2) two armrest structures for foldable centre armrest (for front row seats two fixed armrests with
integrated in-armrest tables);
3) one armrest structure for a foldable armrest aisle side for people with reduced mobility (PRM)
(for front row seats one fixed armrest with integrated in-armrest table);
4) three backrest structures;
5) three recline mechanisms (if a seat is offered only with no recline it shall be indicated);
6) one aisle side stewardess step;
7) all smaller structure items needed, e.g. gap closures;
c) seat cushion assemblies:
1) std. or if required including a fire blocking layer;
d) backrest cushion assemblies:
1) std. or if required including a fire blocking layer;
e) seat belts:
1) for calculation purposes three std. seat belts' weight shall be calculated at 0,315 kg/seat belt
(e.g. three belts = 0,945 kg);
f) backrest tables:
1) three standard backrest table kits including the table itself, table latch and any optional functions
e.g. sliding mechanism and each related means of attachment to seat structure (if a seat table is
offered only with no sliding mechanism it shall be indicated);
g) literature pockets:
1) one on each backrest, minimum size DIN A4 (see EN ISO 216, trimmed size A4 (ISO A series)).
Detailed design shall be specified by the seat supplier;
h) life vest pockets:
1) for calculation purposes three life vest pockets, one under each seat place, designed for a life vest
size of 240 mm × 240 mm × 90 mm and shall be calculated at a weight of 0,600 kg/life vest
(e.g. three life vest pockets = 1
...
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