Firefighters helmets - Helmets for wildland fire fighting

This European Standard specifies the minimum requirements for wildland fire fighting helmets protecting the upper head mainly against the effects of impact, penetration, heat, flame and burning embers whilst conducting fire fighting and associated activities in wildland environments. Requirements for marking and information to be supplied by the manufacturer are included. Wildland fire fighting involves direct and indirect attack techniques (like wood cutting). This helmet is not intended to provide protection during fire entrapment.
Wildland environments include forests, crops, plantations and grass/heath/scrub or farmland.
Helmets for use whilst fire fighting in buildings and other structures are not covered by this European Standard (see EN 443).
Protection of the face, eyes, ears and neck may require additional items of PPE, which are not covered by this European Standard.

Feuerwehrhelme - Helme für Wald- und Flächenbrandbekämpfung

Die vorliegende Europäische Norm legt die Mindestanforderungen an Feuerwehrhelme zur Wald- und Flächenbrandbekämpfung fest, die die obere Kopfhälfte hauptsächlich gegen die Auswirkungen von Stößen, Durchdringung, Hitze, Flammen und glimmender Asche während der Durchführung der Brandbekämpfung und damit zusammenhängenden Maßnahmen bei Wald- und Flächenbrand schützen. Anforderungen an die Kennzeichnung und an die Herstellerinformation sind ebenfalls enthalten. Die Brandbekämpfung erfordert direkte und indirekte Bekämpfungstechniken (wie Holz fällen). Der Helm ist nicht dazu ausgeführt, Schutz zu bieten, wenn der Träger von Flammen eingeschlossen ist.
Wald- und Flächenumgebungen umfassen Wälder, Felder, Plantagen und Gras-/Heide-/Busch- oder Ackerland.
Helme für die Anwendung zur Brandbekämpfung in Gebäuden und anderen baulichen Anlagen werden nicht in dieser Europäischen Norm behandelt (siehe EN 443).
Schutzkleidung für das Gesicht, die Augen, Ohren und den Hals kann zusätzliche Gegenstände Persönlicher Schutzausrüstung umfassen, die in dieser Europäischen Norm nicht behandelt werden.

Casques de sapeurs-pompiers - Casques pour la lutte contre les feux d'espaces naturels

La présente Norme européenne précise les exigences minimales relatives aux casques de lutte contre les feux d'espaces naturels protégeant la partie supérieure de la tête contre les effets d'un choc, d'une pénétration, de la chaleur, des flammes et des braises incandescentes lors des opérations de lutte contre les incendies et les activités connexes dans les espaces naturels. Elle précise également les exigences de fabrication et les informations que le fournisseur doit donner. La lutte contre les feux en espaces naturels implique des techniques d'attaque directes et indirectes (telles que la coupe de bois). Ce casque n'est pas destiné à protéger les sapeurs-pompiers piégés par le feu.
Les espaces naturels incluent les forêts, les récoltes, les plantations, et les prairies/landes/broussailles ou terrains agricoles.
La présente norme ne couvre pas les casques destinés à la lutte contre les incendies dans les constructions et les autres structures (voir EN 443).
La protection du visage, des yeux, des oreilles et du cou peut nécessiter davantage d'EPI (équipements de protection individuelle), qui ne sont pas couverts par la présente norme.

Gasilske čelade - Čelade za gašenje v naravi

Ta evropski standard določa minimalne zahteve za gasilske čelade za gašenje v naravi, ki ščitijo zgornji del glave predvsem pred posledicami udarcev, prebojev, vročine, ognja in goreče žerjavice med gašenjem in povezanimi dejavnostmi v naravnih okoljih. Zahteve za označevanje in informacije, ki jih mora zagotoviti proizvajalec, so vključene. Gašenje v naravi vključuje neposredne in posredne tehnike napada (kot je sekanje dreves). Ta čelada ni namenjena zagotavljanju zaščite v primeru, v katerem gasilce zajame ogenj.
Naravna okolja vključujejo gozdove, polja s pridelki, plantaže in travnike/vresišča/grmičevje ali kmetijska zemljišča.
Ta evropski standard ne vključuje gasilskih čelad za gašenje v stavbah in drugih zgradbah (glej EN 443).
Za zaščito obraza, oči, ušes in vratu je morda potrebna dodatna osebna zaščitna oprema (PPE), ki ni zajeta v tem evropskem standardu.

General Information

Status
Published
Public Enquiry End Date
19-Nov-2012
Publication Date
19-Jan-2015
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
17-Dec-2014
Due Date
21-Feb-2015
Completion Date
20-Jan-2015

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Feuerwehrhelme - Helme für Wald- und FlächenbrandbekämpfungCasques de sapeurs-pompiers - Casques pour la lutte contre les feux d'espaces naturelsFirefighters helmets - Helmets for wildland fire fighting13.340.20Varovalna oprema za glavoHead protective equipment13.220.10Gašenje požaraFire-fightingICS:Ta slovenski standard je istoveten z:EN 16471:2014SIST EN 16471:2015en,fr,de01-februar-2015SIST EN 16471:2015SLOVENSKI

STANDARD
SIST EN 16471:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16471
December 2014 ICS 13.340.20 English Version
Firefighters helmets - Helmets for wildland fire fighting

Casques de sapeurs-pompiers - Casques pour la lutte contre les feux d'espaces naturels

Feuerwehrhelme - Helme für Wald- und Flächenbrandbekämpfung This European Standard was approved by CEN on 2 November 2014.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16471:2014 ESIST EN 16471:2015

EN 16471:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................4 1 Scope ......................................................................................................................................................5 2 Normative references ............................................................................................................................5 3 Terms and definitions ...........................................................................................................................6 4 Physical requirements ..........................................................................................................................6 4.1 Materials .................................................................................................................................................6 4.2 Projections .............................................................................................................................................7 4.3 Retention system ...................................................................................................................................7 4.4 Accessories and non-integral additional protective devices ............................................................7 5 Performance requirements ...................................................................................................................8 5.1 Extent of Coverage ................................................................................................................................8 5.2 Shock absorption...................................................................................................................................8 5.2.1 Crown impact .........................................................................................................................................8 5.2.2 Lateral impacts (front, side, rear) .........................................................................................................8 5.3 Penetration resistance ..........................................................................................................................8 5.4 Retention system effectiveness ...........................................................................................................8 5.5 Retention system strength ...................................................................................................................8 5.6 Flame resistance ....................................................................................................................................8 5.6.1 Helmet shell ............................................................................................................................................8 5.6.2 Retention system ...................................................................................................................................8 5.6.3 Accessories and no integral additional protective devices ..............................................................8 5.7 Radiant heat protection / thermal stress .............................................................................................9 5.8 Thermal resistance ................................................................................................................................9 5.9 Resistance to hot solids .......................................................................................................................9 5.10 Field of vision .........................................................................................................................................9 5.11 Practical performance ........................................................................................................................ 10 5.11.1 General ................................................................................................................................................. 10 5.11.2 Requirements ...................................................................................................................................... 10 6 Test methods ....................................................................................................................................... 10 6.1 Sampling and helmet adjustment ..................................................................................................... 10 6.1.1 Sampling .............................................................................................................................................. 10 6.1.2 Helmet adjustment .............................................................................................................................. 10 6.2 Visual inspection ................................................................................................................................ 11 6.3 Conditioning ........................................................................................................................................ 11 6.3.1 General ................................................................................................................................................. 11 6.3.2 Cleaning and disinfection .................................................................................................................. 11 6.3.3 Ultraviolet (UV) ageing ....................................................................................................................... 11 6.3.4 “Thermal plus” conditioning ............................................................................................................. 11 6.3.5 “Thermal minus” conditioning .......................................................................................................... 11 6.3.6 Wet conditioning ................................................................................................................................. 11 6.4 Extent of coverage .............................................................................................................................. 11 6.4.1 Equipment ........................................................................................................................................... 11 6.4.2 Samples ............................................................................................................................................... 11 6.4.3 Test method ......................................................................................................................................... 11 6.5 Shock absorption................................................................................................................................ 12 6.5.1 General ................................................................................................................................................. 12 6.5.2 Crown impact ...................................................................................................................................... 12 6.5.3 Lateral impacts (front, side, rear) ...................................................................................................... 12 SIST EN 16471:2015

EN 16471:2014 (E) 3 6.6 Penetration resistance ........................................................................................................................ 12 6.7 Retention system effectiveness ......................................................................................................... 12 6.8 Retention system strength ................................................................................................................. 12 6.9 Flame resistance ................................................................................................................................. 13 6.9.1 Helmet shell and items ........................................................................................................................ 13 6.9.2 Helmet retention system components .............................................................................................. 13 6.10 Radiant heat protection/thermal stress ............................................................................................. 13 6.11 Thermal resistance .............................................................................................................................. 13 6.12 Resistance to hot solids ..................................................................................................................... 13 6.13 Field of vision ...................................................................................................................................... 13 6.14 Practical performance testing ............................................................................................................ 13 6.14.1 Test subjects and conditions ............................................................................................................. 13 6.14.2 Procedure ............................................................................................................................................. 14 6.14.3 Test report ............................................................................................................................................ 15 6.14.4 Variants................................................................................................................................................. 15 7 Marking ................................................................................................................................................. 15 8 Information to be supplied by the manufacturer.............................................................................. 16 Annex A (normative)

Conditioning and testing schedule ........................................................................... 18 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 89/686/EEC ....................................................................................... 20

SIST EN 16471:2015

EN 16471:2014 (E) 4 Foreword This document (EN 16471:2014) has been prepared by Technical Committee CEN/TC 158 “Head protection”, the secretariat of which is held by BSI. 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 June 2015 and conflicting national standards shall be withdrawn at the latest by June 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. The purpose of this European Standard is to provide minimum performance requirements for helmets designed for use for extended periods during wildland fire fighting and associated activities. Wildland fire fighting involves work primarily in summer temperatures, for many hours during which the fire fighter may develop high levels of metabolic heat. Consequently, the protective helmet should be comfortable, light and commensurate with the risks to which the fire fighter may be exposed in order to be effective without introducing heat stress to the wearer. This European Standard does not cover helmets for use in situations where helmets conforming to EN 443 are more suitable. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16471:2015

EN 16471:2014 (E) 5 1 Scope This European Standard specifies the minimum requirements for wildland fire fighting helmets protecting the upper head mainly against the effects of impact, penetration, heat, flame and burning embers while conducting fire fighting and associated activities in wildland environments. Requirements for marking and information to be supplied by the manufacturer are included. Wildland fire fighting involves direct and indirect attack techniques (like wood cutting). Wildland environments include forests, crops, plantations and grass/heath/scrub or farmland. Helmets for use while fire fighting in buildings and other structures are not covered by this European Standard (see EN 443). This helmet is not intended to provide protection during fire entrapment. Protection of the face, eyes, ears and neck may require additional items of personal protective equipment (PPE), which are not covered by this European Standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 168:2001, Personal eye-protection - Non-optical test methods EN 960:2006, Headforms for use in the testing of protective helmets EN 1811, Reference test method for release of nickel from all post assemblies which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin EN 13087-1:2000, Protective helmets - Test methods - Part 1: Conditions and conditioning EN 13087-2, Protective helmets - Test methods - Part 2: Shock absorption EN 13087-3:2000, Protective helmets - Test methods - Part 3: Resistance to penetration EN 13087-4, Protective helmets - Test methods - Part 4: Retention system effectiveness EN 13087-5:2012, Protective helmets — Test methods — Part 5: Retention system strength EN 13087-6, Protective helmets - Test methods - Part 6: Field of vision EN 13087-7:2000, Protective helmets - Test methods - Part 7: Flame resistance EN 13087-10, Protective helmets - Test methods - Part 10: Resistance to radiant heat EN ISO 13688, Protective clothing - General requirements (ISO 13688) ISO 17493, Clothing and equipment for protection against heat — Test method for convective heat resistance using a hot air circulating oven SIST EN 16471:2015

EN 16471:2014 (E) 6 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 helmet for wildland fire fighting headwear, including all integral components supplied by the manufacturer, intended primarily to protect the upper part of a wearer's head against hazards which may occur during wildland fire fighting activities Note 1 to entry: Hereafter, helmets for wildland fire fighting are referred to as helmets. 3.2 helmet shell component in hard material with a smooth finish, which gives the helmet its general shape 3.3 protective padding material and/or suspension system which serves to dampen impact energy 3.4 retention system those parts which are responsible for securing the helmet in position on the head, including items which enable adjustment or improved comfort 3.5 chin strap part of a retention system, including a strap which passes under or on the wearer's chin and which helps to ensure that the helmet is correctly maintained in place 3.6 head form shape replacing the head which is used for testing certain characteristics Note 1 to entry: The head form is designed in accordance with EN 960. 3.7 accessories additional device(s) supplied or recommended by the manufacturer which may be attached to the helmet but which provide no protective function to the wearer EXAMPLES Lamp brackets, cable clips, badges and trims. 3.8 non-integral additional protective devices additional protective device(s) supplied or recommended by the manufacturer which may be attached to the helmet and intended to be removable by the user EXAMPLES Mesh visors, ear defenders, neck-guard and safety goggles. 4 Physical requirements 4.1 Materials For those parts of the helmet coming, or that may come, into contact with the skin the material used shall not be subject to any known appreciable alteration from contact with sweat or with substances likely to be found in toiletries. Materials shall not be used which are known to cause skin disorders or other adverse effects on health. SIST EN 16471:2015

EN 16471:2014 (E) 7 Examples of documents, which can be presented as evidence of chemical innocuousness, are given in the note. NOTE The following list of documents is given for information and as examples of documents to be examined: a) materials specifications; b) safety data sheets relating to the materials; c) information relating to the suitability of the materials for use with food, in medical devices, or other relevant applications; d) information relating to toxicological, allergenic, carcinogenic, toxic to reproduction or mutagenic investigations on the materials; e) information relating to ecotoxicological and other environmental investigations on the materials.

The examination should determine whether the claim that the materials are suitable for use in the protective helmet is justified. Particular attention needs to be paid to the presence of plasticisers, unreacted components, heavy metals, impurities and the chemical identity of pigments and dyes. All metallic materials which could come into prolonged contact with the skin (e.g. studs, fittings) shall have a release of Nickel of less than 0,5 µg/cm3 per week, when tested according to EN 1811. Substances recommended for cleaning, maintenance or disinfection shall have no adverse effect on the helmet and shall be not known to be likely to have any adverse effect upon the wearer, when applied in accordance with the manufacturer’s instructions. Materials shall conform to the relevant requirements of EN ISO 13688. 4.2 Projections There shall be no sharp edges, roughness or projections on any part of the helmet, which are likely to cause injury to the wearer, in contact or potential contact with the wearer when the helmet is worn. Test according to 6.14. 4.3 Retention system The helmet shall be fitted with a retention system, including a chinstrap. The chinstrap shall be adjustable in length. 4.4 Accessories and non-integral additional protective devices When the helmet manufacturer states any accessories and/or non-integral additional protective devices, as defined in 3.7 and 3.8, as being for use with the helmet, the helmet with such items fitted to it shall continue to satisfy the requirements of this European Standard. However, some accessories and/or non-integral additional protective devices may not be suitable for wildland fire fighting and only suitable for non-fire fighting associated activities such as wood cutting, road clearance, etc. In such cases, information shall be provided by the manufacturer as to the conditions under which such accessories and/or non-integral additional protective devices may be used. If accessories and non-integral additional protective devices are supplied and/or recommended by the helmet manufacturer they shall individually conform to the requirements of the appropriate standard related to that specific device. SIST EN 16471:2015

EN 16471:2014 (E) 8 5 Performance requirements 5.1 Extent of Coverage When the helmet is tested by the method described in 6.4, it shall cover at least area situated above plane AA’ as defined in EN 960:2006, Figure 1. 5.2 Shock absorption 5.2.1 Crown impact When a helmet is tested by the method described in 6.5.2, the force transmitted to the head form shall not exceed 5 kN, for an impact energy of (50 ± 2) J. 5.2.2 Lateral impacts (front, side, rear) When a helmet is tested by the method described in 6.5.3, the force transmitted to the head form shall not exceed 5 kN, for an impact energy of (25 ± 1) J. 5.3 Penetration resistance When a helmet is tested by the method described in 6.6, there shall be no contact between the striker and the test block, for an impact energy of (30 ± 1) J. 5.4 Retention system effectiveness When a helmet is tested by the method described in 6.7, the helmet shall not come completely off the head form. 5.5 Retention system strength When a helmet is tested by the method described in 6.8, the following shall apply: a) Maximum dynamic elongation shall not exceed 25 mm under the intermediate load condition; b) Minimum width of the chin strap under intermediate load condition shall be 15 mm; c) The release point of the retention system shall be between 500 N and 1 000 N. 5.6 Flame resistance 5.6.1 Helmet shell When a helmet is tested by the method given in 6.9.1, any of the externally exposed materials of the helmet shell, not within 5 mm of an edge, shall not burn with the emission of flame or drip molten material after a period of 5 s has elapsed from removal of the flame. 5.6.2 Retention system Materials of the retention system that are outside of the helmet shell, when tested by the method given in 6.9.2, shall not burn with the emission of flame or drip molten material after a period of 5 s has elapsed from the removal of the flame. 5.6.3 Accessories and non-integral additional protective devices Any items as defined in 3.7 and 3.8 stated as being for use with the helmet by the helmet manufacturer for wildland firefighting and associated operations and on the outside of the helmet shell, shall be tested by the SIST EN 16471:2015

EN 16471:2014 (E) 9 method given in 6.9.1 in their in-use position. The flame shall not be applied within 5 mm of any edge of the item and the item shall not burn with the emission of flame or drip molten material after a period of 5 s has elapsed from the removal of the flame. 5.7 Radiant heat protection / thermal stress When a helmet is tested by the method given in 6.10, the following requirements shall be met during all heating cycles; a) the temperature inside the helmet shall not increase by more than 25 °C; b) no material shall ignite or melt to such a degree as to cause softening or dripping of material so that material that is not in contact with the head form before this test comes into contact with the head form as a result of this test. Test by visual inspection. If the helmet manufacturer states any accessories and/or non-integral additional protective devices as defined in 3.7 and 3.8 as being for use with the helmet for wildland fire fighting, the helmet with such items fitted to it, in their in-use position shall also satisfy these requirements. Upon completion of 3 heating cycles and testing according to 6.10, the helmet shall conform to the impact test requirements according to 5.2.1. 5.8 Thermal resistance When the helmet is tested by the method given in 6.11, it shall conform to the following requirements: a) no material that is not in contact with the head form before this test shall come into contact with the head form as a result of this test. Test by visual inspection; b) there shall be no separation, melting or dripping of material; c) any moveable elements shall remain functional; d) there shall be no ignition of any material; and e) there shall be no ignition, melting or loss of legibility of the product labels. If the helmet manufacturer states that any accessories and/or non-integral additional protective devices, as defined in 3.7 and 3.8, as being for use with the helmet for wildland firefighting, the helmet with such items fitted to it in their in-use position shall also satisfy these requirements. 5.9 Resistance to hot solids No complete penetration, burning, or molten drip of the helmet shell shall occur within 7 s when a helmet is tested by the method given in 6.12. 5.10 Field of vision When the helmet is tested in accordance with 6.13, the wearer's field of vision shall correspond to the following angles: a) horizontal field of vision of not less than 105° on both right and left sides; b) vertical field of vision in the upwards direction of not less than 7°; c) vertical field of vision in the downwards direction of not less than 45°; and SIST EN 16471:2015

EN 16471:2014 (E) 10 d) the specified field of vision shall be achieved with any eye protector in the in-use and out-of-use positions. e) The periphery of the eye protector may fall within the specified field of vision. The eye protector should not restrict the users awareness of the surroundings. 5.11 Practical performance 5.11.1 General Samples used for practical performance shall be supplied separately by the manufacturer in the appropriate sizes and shall not be utilized for any of the laboratory testing identified in Annex A. a) The testing is a subjective assessment of the helmet by the test subject (wearer) and the observer during the trial. b) A record of the observer’s and test subject’s comments shall be made after the trial – see 6.14.3. c) Clothing and footwear chosen shall not compromise any of the activities to be undertaken during the practical performance testing. 5.11.2 Requirements When the helmet is assessed in accordance with 6.14 the following requirements shall be met: a) it shall be possible for the helmet to be adjusted to give a snug fit to the head of the 5 test subjects; b) the helmet shall always remain in place during the activities listed under 6.14.2; c) there shall not be any “NO” answers from any of the 5 test subjects; and d) the removal time during doffing of the helmet shall be < 5 s. 6 Test methods 6.1 Sampling and helmet adjustment 6.1.1 Sampling Helmets shall be submitted for testing in the condition in which they are offered for sale, including any requisite holes or other means of attachment, for any item(s) as defined in the manufacturer’s instructions. If several sizes of helmet are available then the size representing the most unfavourable helmet in relation to headform size shall be used. See Annex A. 6.1.2 Helmet adjustment Before any testing on a headform, the helmet shall be adjusted in accordance with the manufacturer's instructions. The headforms for use in this European Standard shall be sizes 495, 535, 575, 605 and 625 conforming to EN 960:2006, as appropriate to the test performed. If the wearing adjustment covers several sizes of headform then the size of headform representing the most unfavourable case shall be used. See Annex A. SIST EN 16471:2015

EN 16471:2014 (E) 11 6.2 Visual inspection A visual inspection shall be conducted prior to laboratory testing. This shall consist of an assessment of the device marking and information supplied by the manufacturer and any safety data sheets or declarations relevant to the materials used in its construction. Particular attention needs to be paid to the presence of plasticisers, unreacted components, heavy metals, impurities and the chemical identity of pigments and dyes. [EN ISO 13688, 4.2 Innocuousness] This may entail a certain amount of dismantling in accordance with the manufacturer’s instructions for maintenance. If this occurs this helmet shall no

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