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GOVERNMENT OF INDIA AAC No. 2 ot 2013 Dated 20th Janu ary,2013 AIRWORTHINESS CIVIL AVIATION DEPARTMENT ADVISORY CIRCULAR DIRECTOR GENERAL OF CIVIL AVIATION Subject: Modification and Repair 1. INTRODUCTION 1.1 Rule 52 of Aircraft Rules, 1937 describes the requirement for approval of modification or repair affecting safety of any aircraft in respect of which there is a valid certificate of ainrvorthiness. CAR M states that Maintenance procedure shall be established to ensure
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  GOVERNMENT OF INDIA AAC No. 2 ot 2013Dated 20th Janu ary,2013 AIRWORTHINESS CIVIL AVIATION DEPARTMENT ADVISORY CIRCULAR DIRECTOR GENERAL OF CIVIL AVIATION Subject: Modification and Repair 1. INTRODUCTION 1.1 Rule 52 of Aircraft Rules, 1937 describes the requirement for approval of modification or repair affecting safety of any aircraft in respect of which there is a valid certificate of ainrvorthiness. CAR M states that Maintenance procedure shall be established to ensure that damage is assessed and modification and repair are carried out using data approved by the DGCA or by an approved cAR 21|EASA part 2llFAA Part 21 Design organization, as appropriate . lcAo Annex 6 requires that all modification and repair on an operating aircraft shall comply with ainnrorthiness requirements of the State (DGCA) and procedures shal be established to ensure that substantiating data supporting compliance with the airworthiness requirements are retained. This circular stipulates the procedure to be adopted by the owners/operators for approval for carrying out modification and/or repair done on an aircraft, aircraft component and item of equipment of that aircraft.It is important to note that this Airworthiness Advisory Circular (AAC) on its own does not change, create, amend or permit deviations from regulatory requirements, nor does it establish minimum standards.DEFINITION Repair: A design change to an aeronautical product intended to restore it toan airworthy condition and to ensure that the aircraft continues to comply with the design aspects of the airworthiness requirements used for the issuance of Revision 1 dated 28th May,2014 1.2 1.31.41.5  3.2 3.1 3.3 a Type certificate for that aircraft type after it has been damaged or subjected to wear. Major repair: Any repair of an aeronautical product that might appreciably affect the structural strength, performance, power-plant, operation flight characteristics or other qualities affecting ainnrorthiness or environmental characteristics, or that will be embodied in the product using non-standardpractices. Minor repair: A repair other than a major repair. Modification: A modification to an aeronautical product means a change to the type design which is not a repair. Major Modification: A major modification means a type design change not listed in the aircraft, aircraft engine or propeller specifications that might appreciably affect the mass and balance limits, structural strength, performance, power-plant operation, flight characteristics or other qualities affecting ainryorthiness or environmental characteristics, or that will be embodied in the product according to non-standard practices. Minor Modification: A modification other than a major modification. Note. The term alteration is a/so used rnsfead of modification. These terms. wherever used are intended to be synonymous. Procedure for approval of Modification Modification covered in Airworthiness Directives, DGCA Mandatory Modificationand Service Bulletin does not require DGCA approval. Modification which is not covered in Airworthiness Directives, DGCA mandatorymodification and service bulletin require DGCA approval. For modification the owner/operator shall apply to the concerned Regional Ainryorthiness Office (RAO) along with evidences and data relating to the intended modification and its effect on the ainruorthiness of aircraft, as perdetails given in para- 5. 3.4 The modification design data and documents prepared by the aircraft, Revision 1 dated 28th May, 2014  3.5 components/equipment manufacturer, which are duly approved by State ofDesign or the data certified by Authorized Representatives (AR)/ Designated Engineering representatives (DER) of the State of Design of the aircraft areacceptable for use in modification of aircraft, components/equipment. The person responsible for the modification design shall state any particular requirements to be observed when the modification is completed and before an aircraft, component or equipment is released for service. The following aspects shall be considered: a) Whether tests or inspections during the progress or after the completion of the modification are necessary to ensure it complies with the specifiedrequirements. b) The qualifications of persons who may be required to assess completed work and certify that it complies with the approved design. c) Whether significant changes in the weight and centre of gravity position of the aircraft will occur and if re-weighing or preparation of a new weight and balance report is necessary. d) Whether the flight or operating characteristics of an aircraft may have been affected by the work and the necessity to have the aircraft inspected and certified as fit for flight and flight tested. e) Whether amendments of particulars in the Certificate of Ainruorthiness or associated documents are required. f) whether amendments are necessary to the approved maintenance schedule or other data or documents approved for maintenance or other work on the aircraft. g) Whether amendments are necessary to any data specified in the flight crew operating manual. Where a modification affects the instrument panel, it shall be ensured thatinstruments which are used by any one pilot are so arranged as to permit the pilot to see their indications clearly from his or her station, with the minimum practicable deviation from the position and line of vision normally assumed when looking fonrvard along the flight path. Where a modification affects equipment required for communications or navigation purposes, or both, it shall be ensured that the failure of any single unit required for communications or navigation, or both, will not result in the failure of another unit required for communications or navigation.3.63.7 Revision 1 dated 28th May,2014  3'8 Modification documents shall bear a modification reference number, tifle, issue number and date and shall indicate the reason for modification, modification instructions, any limitations and inspection requirements, manuals affected and references to other documents or design data, together with a list of parts and assemblies affected by the modification and, where necessary, drawings orsketches giving particulars of parts before and after modification. 3'9 Approval of a modification will only be granted when the DGCA is satisfied that in respect of the design: a) The drawings, documents, reports, calculations, etc., are adequate to establish that the design r:omplies with the appropriate airworthinessrequirements.b) Any tests or inspections considered necessary for the approval have been completed satisfactorily, c) The drawings and other docurnents required for the work are of a satisfactory standard and in accordance with acceptable aeronautical practices. 3.10 DGCA may require compliance checks after the completion of the modification and before any aircraft component or equipment is released for service. 3'11 All changes to an approved drawing or document will require re-approval of the srcinal. The issue or revision number shall be raised following re-approval. Procedure for approval of RepairRepair covered in the structural Repair Manual (sRM), do not require DGCA approval. This repair may kre carried out by Approved Maintenance Organisation as per data availablle in SRM.Repair which are not covered in ISRM require DGCA approval. The owner/operator shall apply to the concerned Regional Ainnrorthiness Office (RAO) along with evidences and data relating to the intended repair and its effect on the airworthiness of aircraft, as per details given in para- 5. owner/operator will classify flre damage as minor or major based on manufacturer's relevant document or seek assistance from the manufacturer. 4.1 4.24.34.4 Revision 1 dated 28th May,2014
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