(2) a person working under the supervision of an Aircraft Maintenance Engineer (AME), may perform the maintenance, preventive maintenance, and modifications that the supervisory aircraft maintenance engineer is authorised to perform —

(i) if the supervisor personally observes the work being done to the extent necessary to ensure that it is being done properly, and 

(ii)  if the supervisor is readily available, in person, for consultation.

(3)  an aircraft maintenance engineer may perform or supervise the maintenance or modification of an aircraft or aeronautical product for which he or she is rated subject to the limitation of this Schedule. 

(4) an AMO may perform aircraft maintenance within the limits specified by the Authority.

(5) the AOC holder may perform aircraft maintenance as specified by the Authority.

(6) a manufacturer holding an AMO may —

(i) rebuild or alter any aeronautical product manufactured by that manufacturer under a  type or production certificate;

(ii)  rebuild or alter any aeronautical product manufactured by that manufacturer under a TSO Authorisation, a Parts Manufacturer Approval by the State of Design, or Product and Process Specification issued by the State of Design; and

(iii) perform any inspection required by this Schedule on aircraft it manufacturers, while currently operating under a production certificate or under a currently approved production inspection system for such aircraft.

(b) No person may perform any task defined as maintenance on an aircraft or aeronautical product, unless that person has satisfactorily completed a course of training approved by the Authority, sufficient to allow that person to perform the task as specified in 5.160.  Persons who are participants in an approved course may be allowed to carry out tasks for which they have been trained, but only under the direct supervision of an AME.

(c) No person shall be employed by an AOC holder, or an AMO, in a capacity where that person may be asked to perform any task defined as a maintenance task, unless the educational standard achieved by that person is sufficient to allow that person to; 

(i) read and understand clearly the maintenance instructions published by the manufacturer of an aeronautical product, or instructions for continued airworthiness published by an Airworthiness Authority,

(ii) carry out the task as intended by, and to a standard acceptable to the manufacturer or the applicable Authority, and

(iii) document on a worksheet, or in a maintenance logbook, the work that he or she has performed in a manner that can be clearly understood by another person.
 5.150 AUTHORISED PERSONNEL TO APPROVE FOR RETURN TO SERVICE
No person or entity, other than the Authority, may approve an aircraft, airframe, aircraft engine, propeller, appliance, or component part for return to service after it has undergone maintenance, preventive maintenance, rebuilding, or modification, except as provided in the following:
 

(1) a pilot licensed by the Authority may return his or her aircraft to service after performing authorised preventive maintenance.

(2) an aircraft maintenance engineer, appropriately qualified, may approve aircraft and aeronautical products for return to service after he or she has performed, supervised, or inspected its maintenance subject to the limitations of this Schedule.

(3) an AMO may approve aircraft and aeronautical products for return to service as provided in the specifications approved by the Authority. 

(4) an AOC holder may approve aircraft and aeronautical products for return to service as specified by the Authority.
 5.155 PERSONS AUTHORISED TO PERFORM INSPECTIONS
No person, other than the Authority, may perform the inspections required in this Schedule for aircraft and aeronautical products prior to or after it has undergone maintenance, preventive maintenance, rebuilding, or modification, except as provided in the following -
　
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