EN 4726:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Abnahmeparameter von ästhetischen Qualitätsabweichungen für alle sichtbaren Flugzeug-Kabinenbauteile in allen vertraglichen VariantenSérie aérospatiale - Acceptation des variations esthétiques de l'aspect des éléments visibles de cabine d'avion sous toute forme contractuelleAerospace series - Acceptance parameters of aesthetical variations for all visible equipment installed in aircraft cabins under all contractual variations49.095Oprema za potnike in oprema kabinPassenger and cabin equipmentICS:Ta slovenski standard je istoveten z:EN 4726:2018SIST EN 4726:2019en,fr,de01-februar-2019SIST EN 4726:2019SLOVENSKI
STANDARDSIST EN 4726:20151DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4726
November
t r s z ICS
v {ä r { w Supersedes EN
v y t xã t r s wEnglish Version
Aerospace series æ Acceptance parameters of aesthetical variations for all visible equipment installed in aircraft cabins under all contractual variations Série aérospatiale æ Acceptation des variations esthétiques de l 5aspect des éléments visibles de cabine d 5avion sous toute forme contractuelle
Luftæ und Raumfahrt æ Abnahmeparameter von ästhetischen Qualitätsabweichungen für alle sichtbaren FlugzeugæKabinenbauteile in allen vertraglichen Varianten This European Standard was approved by CEN on
s u May
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v y t xã t r s z ESIST EN 4726:2019

Page European foreword . 3 1 Scope . 4 2 Normative references . 4 3 Terms, definitions and abbreviations . 4 4 Definitions of cosmetic defects, inspection zones and criteria . 6 5 Unacceptable characteristics . 39 6 Evaluation tables and defect size assessment . 62 7 Inspection template to ascertain defect sizes . 64
(informative)
Standard evolution form . 66
This document aims to: a) provide the supplier or manufacturer with quality criteria, which need to be met during the production, testing- and quality-inspection-process. b) guide airline-, OEM- and supplier-quality assurance with a description of cosmetic standards for following inspections: — supplier internal QA inspection; — first article inspection; — source inspection; — incoming inspection; — final assembly line, cabin inspection; — customer presentation. 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 12464-1, Light and lighting - Lighting of work places — Part 1: Indoor work places EN ISO 2813, Paints and varnishes — Determination of gloss value at 20°, 60° and 85° 3 Terms, definitions and abbreviations 3.1 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp SIST EN 4726:2019

a) Passegner and crew member seating, top view b) Passenger and crew member seating, side view c) Passenger and crew member walking NOTE The viewing cone would move according to the head movements up/down and left/right. Figure 1 — Passenger’s viewing cone when seating in any position or walking through the cabin SIST EN 4726:2019

4.2.3 Zone C Surfaces that require - first “opening up”, e.g. folding, moving or removal of primary or secondarily viewed areas, In order to view the area in question e.g. inside a lavatory mirror cabinet. Can only be viewed using equipment. Areas expected to be perceived by support staff and not passengers. Areas not visible after installation and that have no defined aesthetical surface treatment are still within the parameters of zone C; however still maintaining other requirements e.g. closed edges, fit, form and function etc. Sizes/dimensions of areas/surfaces eligible shall be demonstrated in the technical documentation and require the OEM acceptance. 4.3 Classification of surfaces to be inspected The surfaces to be inspected are classified into three zones (A, B, C). Customers and suppliers shall document at initial technical coordination meeting or functionally similar meeting latest at Critical Design Review (CDR) or functionally similar meeting areas that may be exceptions after installation in the cabin of the aircraft, all other surfaces according to the below zonal prerequisites unless otherwise agreed. For BFE additionally (or similar status): The customer is required to clearly document and inform the OEM and supplier of his expectations regarding classification of surfaces. Figure 2 shows typical areas for the zones, which are applied cross programm i.e. irrelevant of passenger aircraft model.
Cockpit areas (incl freighters) are considered outside of this European standard and need to be defined on demand between OEM, supplier and customer. The exception to this, is furniture, e.g. lavatories or crew rest that share common walls with the cabin. Freighters, currier or crew perceived or frequented areas i.e. cabin linings/furniture are “A” zones, cargo areas are considered outside this classification and need to be defined on demand between OEM, supplier and customer. SIST EN 4726:2019

Key 1 Outboard side of a window shade is C zone. Inboard A zone 2 Side wall stowage lid shown open to view lid inside 3 Window funnel interior is A zone NOTE 1 Endcaps on over head stowage compartment is not shown. NOTE 2 LHS lining is a mirror of the RHS. NOTE 3 Linings- outboard surfaces are generally C zone. NOTE 4 Linings- inboard surfaces are generally A zone.
A zone
B zone
C zone Figure 2 — Cabin lining The Figure 3 to Figure 14 show typical areas for the zones which are applied cross program, i.e. irrelevant of passenger aircraft model or monument type.
Interior parts of monuments which the cabin crew or passenger potentially frequent, perceive or view, e.g. lavatories, crew rest, special monuments, etc. are equally governed by the same zone classifications as for the outside of SFE (or similar status) monuments. Areas covered by other components or monuments will be considered as “C” zones unless, see 4.4. SIST EN 4726:2019

a) Typical monument with magazine rack and doghouse b) Typical monument without additional furnishings Key
A zone
C zone Figure 3 — Cabin monument
a) Galley overview SIST EN 4726:2019

b) Fixed parts e.g. ovens, coffee makers, boilers; no side visible: C zone c) Fixed parts e.g. ovens, coffee makers, boilers; sides visible: Surrounding gap makes sides visible then first 10 cm (4 inch) of sides are A zone thereafter C zone d) SFE trolley: outside A zone, door inside, interior: B zone, interior shelves etc.: B zone, underneath: C zone, tyres factory new e) Removable parts e.g. SU: First 10 cm (4 inch) of sides are A zone, thereafter C zone Key 1 Walls for fixed parts e.g. ovens, boilers: C zone unless gap makes sides visible then first 10 cm
(4 inch): A zone 2 Walls for removable parts e.g. SU first 10 cm (4 inch) is A zone thereafter C zone 3 Stowage inside: B zone incl. door inside trolley doors inside 4 Underneath is C zone 5 Underneath is B zone, because it cannot be directly viewed; if higher this will become an A zone
NOTE Supplied used BFE units e.g. trolleys or standard units etc. shall not be part of an inspection concerning aesthetical deviations, only new and SFE are eligible. Zonal areas are dedicated to the parts in questions according to the expected operational status, i.e. with full compliment of inserts, trollies, standard units etc.
A zone
B zone
C zone Figure 4 — Galley SIST EN 4726:2019

Key 1 Rear sides: if free standing or has any kind of seating behind: A zone. If last row and screened off by
a wall: B zone 2 Underneath head cloths (if present): due to the fact, they are not permanent and may be removed in
the future: A zone 3 Aisle sides: if aisle side: A zone. If window side: B zone (or next to a structure which screens off
viewing the side in question) 4 Underneath armrest: if movable: A zone, if fixed: B zone 5 Tables and mechanisms (incl. hidden in armrest): top and bottom i.e. all sides (incl. IFE if present): A zone 6 Underneath seat: if “with footrest” movable or fixed: B zone. Top of footrest and mechanism when
deployed: A zone. Non visible sides when deployed: B zone NOTE 1 Passenger/crew used furniture directly viewed in open operating position:
Compartments inside: B zone
(assuming surfaces mainly hidden by supplied amenities), Areas of compartments which can be
directly viewed when open and seated: A zone NOTE 2 Lids/flaps inside/outside: A zone Figure 5 — Economy passenger seat SIST EN 4726:2019

Key 1 Stowages insides: B zone 2 Rear walls, if free standing: A zone; if rear side very close to a wall (i.e. masked by wall): B zone 3 Aisle walls, if aisle side: A zone; if window side: B zone 4 Underneath, if “footrest” returns down and backwards: B zone; if “footrest” returns up and
backwards: A zone; if “footrest” cannot be viewed incl. during operational movement: C zone 5 Reade side: A zone 6 Stowage insides: B zone 7 Tables top and bottom: A zone 8 LCD monitor: A zone
A zone
B zone Figure 6 — Business class passenger seat SIST EN 4726:2019

Key 1 Hidden sides: not able to be viewed are B zone 2 Inside open cupboards: could be a B zone on the “shadow side only” according to the direct viewing rules, (assuming this side is not visible when entering the compartment), otherwise A zone 3 Moving furniture parts: if, when operating the table, all sides are revealed, then all A zone
(underside B zone, only if never viewable) 4 Recessed areas: only ones not naturally visible are B zone
A zone
B zone
C zone Figure 7 — Typical first class minisuite – inside, front view (looking forward) SIST EN 4726:2019

Key 1 blocked off areas: C zone 2 Stowages inside: B zone, incl. door inside 3 Undersides: B zone, unless they can be viewed from other natural positions e.g. sleep, then A zone 4 Covered areas: C zone, areas hidden e.g. by the seat, but run into an A zone at the top. In cases of contention, the highest quality is default. To establish zonal transitions/boundaries, all permutations of natural/possible usage viewing angles are vectored in 5 Recessed areas: only ones not naturally visisble are B zone. If visible when entering minisuite then A zone 6 Blocked off areas: C zone
A zone
B zone
C zone Figure 8 — Typical first class credenza, side view (looking forward) SIST EN 4726:2019

Key 1 Passenger seat used furniture directly viewed in open or operating position: compartments inside: B zone (assuming surfaces mainly hidden by supplied amenities), Areas of compartment which can be directly viewed when open and seated: A zone 2 Lids/flaps inside/outside: A zone 3 Tops: A zone (unless so high it cannot be viewed from a standing position i.e. over 1,90 m (74.8 inch))
A zone
B zone Figure 9 — Typical first class minisuite with table deployed and doors open, plan view (looking from top)
Key 1 Plastic screens: A zone (unless otherwise pre-agreed due to manufacturing tolerances) 2 Areas behind moving parts: C zone, incl. door inside areas, as long as they are never visible (rest: A zone)
A zone
C zone Figure 10 — Typical first class minisuite – outside, doors shown closed, side view (looking outboard) SIST EN 4726:2019

Key 1 Blocked off areas: C zone 2 Parts close to each other: A zone (where clearly visible) 3 Shadowed parts: B zone which will transition to an A zone e.g. the seat and wall are relatively close, the bottom of these parts are in shadow and cannot be clearly perceived. In case of contention, the highest quality is default (to establish zonal transitions/boundaries – all permutations of natural/possible usage viewing angles are vectored in)
A zone
B zone
C zone Figure 11 — Typical first class minisuite – inside, doors shown closed, side view (looking inboard)
Key 1 Covered area (this side only): C zone 2 Underneath: B zone
A zone
B zone Figure 12 — Typical first class minisuite seat SIST EN 4726:2019

Figure 13 shows typical areas for the zonal classification. Areas/parts allowing functional manual or driven movement; thereby becoming fully visible to the passenger or cabin crew are classed as “A” zones. In some cases the installation position is paramount, facets covered up of wall flush items will have an upgraded classification if free standing.
Key 1 Only if flush to a wall: B zone behind headrest, back of seat 2 A zone, under seat pan shroud, underneath of footrest
A zone
B zone Figure 13 — Cabin attendant seat SIST EN 4726:2019

Key 1 Corpus outside: A zone; if masked by wall, seat, etc. visible area: B zone, any areas completely not visible: C zone 2 Corpus inside: B zone; if part of inside not visible by normal operation: C zone 3 Drawer and door inside: B zone 4 Door outside: A zone 5 Drawer bottom: C zone 6 Corpus bottom inside: C zone 7 Corpus bottom: C zone 8 Backside if outboard lateral side: B zone; if free standing: A zone
A zone
B zone
C zone Figure 14 — Example of doghouse 4.4 Exception to classification of surfaces If the customer has an accepted Request for Change (RFC)/Specific Change Note (SCN) to upgrade a particular area of a monument, e.g. the inside of a stowage door, the door inside shall become an A zone surface instead of an B zone.
4.5 Split lines, definition, cutting and placement of decorative materials and sealing 4.5.1 General Split lines refer to the physical split of decorative material and not to a pattern alignment which is covered in 4.5.3. Decor split line positions are defined by the pertinent OEM department under advisement and in conjunction with the supplier so as to include all aspects of design prerequisites and feasibility.
Split lines are inherent to a successful and controllable development and in some cases a necessity to achieve pattern harmony; therefore a split line or its position cannot be accepted as a reason for SIST EN 4726:2019

4.5.2 General split line rules for decorative materials General split line rules for decorative materials are: a) Any applied film, split line position tolerance is 2 mm, i.e. ±1 mm (0.079 inch ± 0.039 inch) on curved or wavy surfaces and shall be 1 mm, i.e. ±0,5 mm (0.039 inch ± 0.02 inch) on purely flat surfaces. For decorative sheet material (DSM) film see 4.5.3 b. b) In cases of split line production templates, the templates may also be used for quality inspection checks. c) Split line necessity overrules aesthetic reasoning. d) Parts with integrated deep recesses or 3D shapes surpass most technical solutions for films and therefore generally split lines shall be set or a different medium chosen. e) Decorative Sheet Material (DSM) (formally known as PVF film) split lines are always overlapped by 10 mm (0.393 inch) and if wrapped around edges, e.g. doors, etc. shall also have a minimum of 10 mm (0.393 inch) wrap around. Reinforced material (DSM film) is always butt jointed. f) All split lines in all mediums are optically straight, neat (no over spray by painting) and run parallel to edges, i.e. vertical or horizontal, unless otherwise defined. If a split line is noticeable to the eye, i.e. slanted it is considered a defect. Butt joint edges cover the substrate panel completely, i.e. nothing of the panel is visible through the butt joint. g) Split lines are as a rule visible and are therefore so acceptable, although the goal is always to make them as least obvious as possible. h) Split lines for Hydro Transfer Printing Technology (HTPT) have a different set of rules and can be found in the HTPT document. i) Paint split lines whereby two different colours meet on a single part shall have a smooth transition, i.e. no noticeable (to the touch) paint depth difference at the edge (supplier to provide samples for acceptance). j) DSM cut edges are never left exposed except when an overlap is defined. k) Split lines that are not to the OEM interior colour specifications i.e. definitions are considered a defect and shall be re-worked.
4.5.3 Pattern alignment over two or more sheets/parts Pattern alignment over two or more sheets/parts are: a) Pattern alignment refers generally to the printed decorative layer of a Decorative Sheet Material (DSM) film. Non-standard materials that are embossed, engraved, textile, natural products, imitations of natural products, suspended compounds and special effects or have a structured surfaces etc. shall be handled on a case by case method during the prototyping phase and thereby the parameters documented by the manufacturer and submitted to the OEM for validation. SIST EN 4726:2019

a) Material planning, original pattern data as example (perfect) b) Production material, “warping” exaggerated for better comprehension
c) Control point for both sheets positioned correctly, sheet 1 and sheet 2 are approximately the same size d) Control point for both sheets positioned correctly, horizontal or vertical application has not been followed SIST EN 4726:2019

e) Control point for both sheets positioned correctly, sheet 1 and sheet 2 are not exactly the same size, sheet 2 has expanded slightly f) Both (or even one) control point are not positioned correctly
g) Control points at the correct height but not position, sheet 1 and sheet 2 are positioned wrongly h) Control points at the correct height but not position, décor not trimmed properly and aligned to give continuous flow Key 1 Predefined control point a Decor sheet 1 b Decor sheet 2
Ok
Not Ok Figure 15 — Pattern alignment basic rules SIST EN 4726:2019

a)
b)
c)
Figure 16 — Examples of smoothing tools to be used to apply the silicon uniformly
4.5.5 Sealing (hard seals e.g. “P” seals, blade seals etc.) Seals shall follow the master sample process and be submitted to the OEM for validation. 4.6 Time limits and part appraisal There is no specific time limitation for part appraisal. This is due to the diversity and complexity of parts and finishes which shall also be cross-referenced with the pertinent interior colour specification and any special inspection requirements. The inspector shall be allowed to assess the complete validated area of inspection, without time constraints. All inspections should be carried out as expediently as possible with a fair and sensible orientation. 4.7 Distance from the test specimen 4.7.1 Distance at FAI-, source- and incoming – inspection (general ruling) The distance to the surfaces of all items to be inspected shall be not less than 0,4 m (15.748 inch) without any sight enhancing or influencing (e.g. tinted glasses) instrumentation (if any imperfections are discovered, analysis shall be closer and case dependent). Viewing angles are at the discretion of the inspector and environmental conditions. Only once a finding is established will the evaluation tables and size quantification template in clause 6 and clause 7 determine validity. The template (printed out onto a pure transparent medium) shall not be scaled and shall have true measurements. A multitude of observation angles may be employed to capture any aesthetical deviation characteristics. In cases of contention or uncertainty the parts shall be submitted to the OEM for systematic evaluation. SIST EN 4726:2019

a) for small objects b) for large objects (walk-in type shown) Key 1 The main light source may be up to 45° from the centre as long shadows do not interfere with the
inspection 2 Approximately 1 000 lux on inspection area surface 3 Small object, may be rotated to inspect all pertinent surfaces 4 Inspection platform 5 Approximately 1 000 lux on top of object 6 If integrated, interior viewed using integrated lighting only (all). If not integrated, pertinent lighting
to be set up to illuminate the interior (from outside) 7 Large object Figure 17 — Typical inspection area set up 4.9.2 Additional light sources Defects only seen with additional light sources (flash light) will not be accepted if 4.9.1 is fulfilled. For outside inspection in final assembly line area no additional lights are required to detect any defects. SIST EN 4726:2019

Cuts, cracks, scratches, bad texturing, worn, faded, conspicuous flow marks, bent, badly fitting, pits and burrs on plastic parts, e.g. folding table or cup-holder are not acceptable as defined. Some plastics which are completely transparent may have small pits in the surface, these pits are subject to the evaluation tables in clause 6, unless otherwise accepted by the OEM through the master sample process. Some plastics will change colour in relationship to the thickness, only the correct thickness shall be compared to the item in question. Common coloured plastic parts from the same manufacturer whereby differences are noticed will be handled by the master sample process. For plastic materials not listed or described above the OEM shall be please contacted. 4.9.3.11 Production masters OEM suppliers/manufacturers shall prepare new production samples corresponding to the OEM requirements and directives, for acceptance by the OEM or when considered necessary by the airline customer. Production samples prepared by suppliers/manufacturers shall be signed off by their internal QC representative and approved by the OEM to become valid.
Samples not preserved in the recommended controlled conditions or the shelf life has expired shall lose their validity (even with pertinent signature). Shelf-life is indicated on the labels The master samples agreed by the OEM and the suppl
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