. /.  WORLD TRADE  
ORGANIZATION  G/TBT/N/MEX/202 
29 September 2010 
 (10-4947) 
Committee on Technical Barriers to Trade Original:   Spanish 
  
 
NOTIFICATION 
 
The following notification is being circ ulated in accordance with Article 10.6. 
 
1. Member to Agreement notifying:   MEXICO
 
If applicable, name of local government involved (Articles 3.2 and 7.2):  
2. Agency responsible:  Secretaría de Comunicaciones y Transportes 
(Ministry of Communications and Transport) 
Name and address (including telephone and fax numbers, e-mail and website 
addresses, if available) of  agency or authority designated to handle comments 
regarding the notification shall be  indicated if different from above:  
Comité Consultivo Nacional de No rmalización de Transporte Aéreo 
(National Advisory Committee on Standardization for Air Transport)  
Providencia No. 807, 3er. piso 
Colonia Del Valle Código postal 03100 México, Distrito Federal Tel.: 50-11-64-08 
Fax: 55-23-62-75 
E-mail: acanogal@sct.gob.mx
 
Website: http://www.sct.gob.mx  
3. Notified under Article 2.9.2 [X], 2.10.1 [ ], 5.6.2 [ ], 5.7.1 [ ], other:  
4. Products covered (HS or CCCN where applicable, otherwise national tariff heading.  
ICS numbers may be provided in  addition, where applicable):   Aircraft, engines, 
propellers and fittings. 
5. Title, number of pages and language(s) of the notified document : 
PROY-NOM-021/3-SCT3-2010, Que establece los requerimientos que deben cumplir los 
estudios técnicos para las modificaciones o alt eraciones que afecten el diseño original de 
una aeronave (Draft Mexican Official  Standard PROY-NOM-021/3- SCT3-2010 establishing 
the requirements to be met by technical studies  that are conducted with a view to making 
modifications or alterations  affecting the original design of an aircraft) (11 pages, in Spanish) 
6. Description of content:   Air operators, licence holders and agents wishing to make a 
significant alteration or modification that affect s the original design of an aircraft with 
Mexican nationality and registration marks, or  its parts and components, may do so in 
accordance with the guid elines set forth in the notified Mexican Official Standard. G/TBT/N/MEX/202 
Page 2  
 
   Air operators, licence holders and agents owning any of the products listed in point 3.11 of 
the notified Standard shall not operate su ch products when significantly altered or 
modified, except where the requirements of the technical study provided for in the Standard 
have been met.  This technical study must confirm that the alteration or modification does 
not affect the airworthiness of the aircraft (t he main body in the case of helicopters) or the 
engine, propellers, components and fittings thereof. 
Air operators, licence holders and agents needing to make a significant alteration or 
modification to their aircraft that will affect its original design shall, where this is not considered in the technical information issued  by the body responsible for the type design 
of the aircraft (e.g. the structural repairs manual, overhaul manual, services or maintenance 
manual or service bulletins), ensure that such a lterations or modifications are carried out in 
an aeronautical workshop and that they are technically justified. 
Regulatory Appendix A ("Significant alterati ons or modifications") of the notified 
Standard lists, by way of example, some signi ficant modifications and alterations that are 
considered to affect the original design of an aircraft.  
7. Objective and rationale, including the nature of urgent problems where applicable:  
The notified text sets forth the requirements to be met by technical studies that are conducted 
with a view to making alterations or modifications  affecting the original design of an aircraft.  
It applies to all modifiable products, namely  aircraft, engines, pr opellers and fittings. 
8. Relevant documents: 
- Diario Oficial de la Federación  (Official Journal) of 8 September 2010: 
http://www.dof.gob.mx ; 
- Annex 6 of the  Convention on International Civil Aviation:  Part I, Chapter 8, 
paragraphs 8.1 and 8.6;  Part II, Section 2,  Chapter 2.6, paragraphs 2.6.1 and 2.6.3; 
Part II, Section 3, Chapter 3.8;  Part III,  Section II, Chapter 6, paragraphs 6.1 and 
6.6;  and Part III, Section III, Ch apter 6, paragraphs 6.1 and 6.4. 
9. Proposed date of adoption: 
Proposed date of entry into force:   Upon publication as a Mexican Official 
Standard in the Official Journal. 
60 calendar days after publication in the 
Official Journal. 
10. Final date for comments:   8 November 2010 
11. Texts available from:  National enquiry  point [X] or address, telephone and fax 
numbers, e-mail and website addresses,  if available of the other body: 
Secretaría de Economía 
Subsecretaría de Competitividad y Normatividad 
Dirección General de Normas Tel.: (+52) 55 5729 9100, Ext. 43217 Fax: (+52) 55 5520 9715 Website: http://www.economia.gob.mx/swb/es/economia/p_competitiv_normativ
 
E-mail: normasomc@economia.gob.mx  and/or jesus.figueroa@economia.gob.mx  
Text also available at: 
http://www.dof.gob.mx/nota_detalle. php?codigo=5158341& fecha=08/09/2010  
http://members.wto.org/crnattach ments/2010/tbt/MEX/10_3649_00_s.pdf