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References to the overhaul, repair, replacement or modifica- tion of an aircraft include references to the overhaul, repair, replacement of pans, or modification of its engines, components, accessories, instruments, equipment, or apparatus, or the installa- tion thereof, and in the case of modifications include references to changes in the type of engines, components, accessories, instru- ments, equipment or apparatus from those previously fitted.
Approval of modifications not previously the subject of investigation.
48. With reference to Article 14 of the Order-
(1) The modifications of an aircraft for which approval in writing is required to be obtained are all those modifications which have not been previously so approved and which, in the upiaion of the Director, affect the safety of the aircraft:
Provided that if a trodification has already been approved in relation to one aircraft of any type it shall not be necessary to obtain approval for the same modification when incorporated in another aircraft of the same type, subject, however, to compliance with the requirements of regulation 49.
(2) Application for the approval of modifications under paragraph (1) of this regulation should be made in writing to the Director,
Requirements relating generally to overhauls, repairs, replacements and approved modifications.
49. The following requirements shall apply to overhauls, repairs, replacements and to approved modifications carried our to an aircraft in respect of which a certificate of airworthiness or a validation issued under the provisions of the Order is, or has been, in force-
(i) The work shall be carried out in all essential respects in accordance with the approved design in conformity with which the aircraft was constructed including such modi- fications as have been approved for embodiment therein, or, alternatively, shall be undertaken in accordance with a repair scheme approved in writing.
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(ii) All materials used shall be as approved for the design In conformity with which the aircraft was constructed, or as otherwise approved.
(iii) All work shall be inspected, to the extent necessary in the circumstances of the case, in accordance with the require- ments of the Director.
(iv) A certificate in accordance with the terms of regulation so shall be given, and, if the Director so require, the certi- ficate of airworthiness of the aircraft shall be forwarded forthwith to the Director in order that it may be amended;
Provided that in emergency if it is not reasonably practicable to comply with the above requirements a temporary repair of the part or parts affected may be made for the sole purpose of enabling the aircraft to proceed to the nearest place at which a repair complying with the above requirements can be carried out, and, if the person in command of the aircraft is satisfied that, having regard to the circumstances and exigencies of the case, such repair is adequate for the purpose, the aircraft may then proceed to fly to such place without having such temporary repair certified in accordance with the foregoing requirements.
Certification of overhauls, repairs, replacements and modifications.
50. The following provisions shall apply to or in relation to every certificate given under regulation 49-
(1) The certificate shall be signed and dated by the holder of an aircraft maintenance cagineer's licence granted or rendered valid under the Order, by the authorized representative of any firm or company approved as qualified to furnish such a certificate, or by any person so approved;
(2) The certificate shall set out particulars of the overhaul, repair, replacement or modification to which shall be appended the following words-
I hereby certify that in carrying out the
overhaul
repair
replacement
modification