43.54 Maintenance required under Part 145
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(a) A person must not (except under the authority of a maintenance
organisation certificate issued by the Director under the Act and Part 145)
perform maintenance on, or certify for release-to-service,--
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(1) an aircraft that has a MCTOW of more than 5700 kg or a
certificated passenger seating configuration, excluding any
required crew member seat, of 10 seats or more if the aircraft is
used to perform--
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(i) air operations under the authority of an air operator
certificate issued by the Director under the Act and Part
119; or
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(ii) adventure aviation operations under the authority of an
adventure aviation operator certificate issued by the
Director under the Act and Part 115, excluding a hot air
balloon; or
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(2) a component fitted or intended to be fitted to an aircraft referred
to in paragraph (1).
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(b) Except as provided in paragraph (c), a person must not (except under
the authority of a maintenance organisation certificate issued by the
Director under the Act and Part 145) perform any of the following kinds of
maintenance on an aircraft or component, or certify the aircraft or
component for release-to-service after the maintenance:
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(1) overhaul of a component;
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(2) maintenance on an aircraft or component if the relevant
instructions for continued airworthiness require the use of a jig
that is approved or certified by the manufacturer or that is
approved by the Director;
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(3) maintenance on a component if the maintenance involves the
disturbance of any part of the component that is supplied as a
bench tested unit, except if--
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(i) the disturbance is for the replacement or adjustment of a
part normally replaceable or adjustable in service; and
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(ii) subsequent functioning of the part disturbed can be
demonstrated without the use of test apparatus that is
additional to the test apparatus used for normal
functioning checks;
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(4) maintenance on an aircraft engine if the maintenance involves--
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(i) dismantling and reassembly of a piston engine, except
where the dismantling and reassembly is to obtain access
to the piston or cylinder assembly; or
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(ii) dismantling and reassembly of a main casing or main
rotating assembly of a turbine engine, except if the
dismantling and reassembly is for the replacement of a
main casing or rotating assembly and the instructions for
continued airworthiness for the engine provides
instructions for the replacement, and the replacement of
the main casing or rotating assembly of the engine is
achieved solely by disconnecting the flanges of main
casings; or
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(iii) disturbance of reduction gear;
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(5) aircraft propeller balancing other than in situ dynamic propeller
balancing in accordance with the aircraft manufacturer's
instructions;
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(6) maintenance on a helicopter if the maintenance involves the
dismantling of any transmission gearbox, except if the
dismantling is for separation of casings to obtain access for the
purpose of internal inspection in accordance with the helicopter
manufacturer's instructions.
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(c) Except for an aircraft that is operated on an adventure aviation
operation, paragraph (b) does not apply to--
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(1) an aircraft that has a special category airworthiness certificate
issued by the Director under the Act and Subpart H of Part 21; or
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(2) a microlight aircraft; or
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(3) a glider or powered glider; or
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(4) a hot air balloon.