Part-145 Maintenance Data and Performance

(a)The organisation shall hold and use applicable current maintenance data which is necessary

in the performance of maintenance, including modifications and repairs. “Applicable” means

relevant to any aircraft, component or process specified in the organisation’s terms of approval

and in any associated capability list.

In the case of maintenance data provided by the person or organisation requesting the

maintenance, the organisation shall hold such data when the work is in progress, with the

exception of the need to comply with point 145.A.55(a)(3).

(b)Applicable maintenance data is the data specified in point M.A.401(b) of Annex I (Part-M) or

in point ML.A.401(b) of Annex Vb (Part-ML), as applicable.

(c)The organisation shall establish procedures to ensure that if inaccurate, incomplete or

ambiguous procedure, practice, information or maintenance instruction is found in the

maintenance data used by maintenance personnel, it is recorded as part of the internal safety

reporting scheme referred to in point 145.A.202 and notified to the author of the maintenance

data.

(d)The organisation may only modify maintenance instructions in accordance with a procedure

that is specified in the MOE. With respect to changes to maintenance instructions, the

organisation shall demonstrate that they result in equivalent or improved maintenance standards,

and shall inform the author of the maintenance instructions of such changes. For the purposes of

this point, “maintenance instructions” mean instructions on how to carry out a particular

maintenance task; they exclude the engineering design of repairs and modifications.

[…]

(e)The organisation shall provide a common work card or worksheet system to be used throughout

the relevant parts of the organisation. In addition, the organisation shall either accurately

transcribe the maintenance data referred to in points (b) and (d) onto such work cards or

worksheets, or make precise reference to the particular maintenance task or tasks contained in

that maintenance data.

[…]

(g)The organisation shall establish a procedure to ensure that maintenance data it controls is

kept up to date. In the case of operator/customer controlled and provided maintenance data, the

organisation shall be able to show that either it has written confirmation from the

operator/customer that all such maintenance data is up to date or it has work orders specifying

the amendment status of the maintenance data to be used or it can show that it is on the

operator/customer maintenance data amendment list.

Quoted word for word from Regulation (EU) No 1321/2014, Easy Access Rules for Continuing Airworthiness, 2 Sep 2025 revision.

(a)Classification of components. All components shall be classified into the following

categories:

(i)Components which are in a satisfactory condition, released on an EASA Form 1 or equivalent

and marked in accordance with Subpart Q of Annex I (Part 21) or, as applicable, Subpart Q of

Section A of Annex Ib (Part 21 Light) to Regulation (EU) No 748/2012, unless otherwise specified

in point 21.A.307 of Annex I (Part 21) or point 21L.A.193 of Annex Ib (Part 21 Light) to

Regulation (EU) No 748/2012, in point M.A.502 of Annex I (Part-M), in point ML.A.502 of Annex

III (Part-ML), or in this Annex (Part-145).

(ii)Unserviceable components which shall be maintained in accordance with this Regulation.

(iii)Components categorised as unsalvageable because they have reached their mandatory life

limitation or contain a non-repairable defect.

(iv)Standard parts used on an aircraft, engine, propeller or other aircraft component when

specified in the maintenance data and accompanied by evidence of conformity traceable to the

applicable standard.

(v)Material, both raw and consumable, used in the course of maintenance when the organisation

is satisfied that the material meets the required specification and has appropriate

traceability. All material shall be accompanied by documentation clearly relating to the

particular material and containing a conformity to specification statement as well as the

manufacturing and supplier source.

(b)Components, standard parts and materials for installation

(i)The organisation shall establish procedures for the acceptance of components, standard parts

and materials for installation to ensure that components, standard parts and materials are in

satisfactory condition and meet the applicable requirements of point (a).

(ii)The organisation shall establish procedures to ensure that components, standard parts and

materials shall only be installed on an aircraft or a component when they are in satisfactory

condition, meet the applicable requirements of point (a) and the applicable maintenance data

specifies the particular component, standard part or material.

[…]

(c)Segregation of components

(i)Unserviceable and unsalvageable components shall be segregated from serviceable components,

standards parts and materials.

(ii)Unsalvageable components shall not be permitted to re-enter the component supply system,

unless mandatory life limitation have been extended or a repair solution has been approved in

accordance with Regulation (EU) No 748/2012.

Quoted word for word from Regulation (EU) No 1321/2014, Easy Access Rules for Continuing Airworthiness, 2 Sep 2025 revision.

(a)The organisation shall have available and use the necessary equipment and tools to perform

the approved scope of work.

(i)Where the manufacturer specifies a particular tool or equipment, the organisation shall use

that tool or equipment, unless the use of alternative tooling or equipment is agreed by the

competent authority via procedures specified in the exposition.

[…]

(b)The organisation shall ensure that all tools, equipment and particularly test equipment, as

appropriate, are controlled and calibrated according to an officially recognised standard at a

frequency to ensure serviceability and accuracy. Records of such calibrations and traceability

to the standard used shall be kept by the organisation.

Quoted word for word from Regulation (EU) No 1321/2014, Easy Access Rules for Continuing Airworthiness, 2 Sep 2025 revision.

(a)The organisation shall have a system appropriate to the amount and complexity of work to

plan the availability of all necessary personnel, tools, equipment, material, maintenance data

and facilities in order to ensure the safe completion of the maintenance work.

(b)As part of the management system, the planning of maintenance tasks, and the organising of

shifts, shall take into account human performance limitations, including the threat of fatigue

for maintenance personnel.

(c)When it is required to hand over the continuation or completion of maintenance tasks for

reasons of a shift or personnel changeover, relevant information shall be adequately

communicated between outgoing and incoming personnel.

[…]

Quoted word for word from Regulation (EU) No 1321/2014, Easy Access Rules for Continuing Airworthiness, 2 Sep 2025 revision.

(a)The organisation may only carry out maintenance on an aircraft or component for which it is

approved when all the necessary facilities, equipment, tooling, material, maintenance data and

personnel are available.

(b)The organisation shall be responsible for the maintenance that is performed within the scope

of its approval.

(c)The organisation shall ensure that:

(1)after the completion of the maintenance, a general verification is carried out to ensure

that the aircraft or component is clear of all tools, equipment and any extraneous parts or

material, and that all access panels that were removed have been refitted;

(2)an error-capturing method is implemented after the performance of any critical maintenance

task;

(3)the risk of errors during maintenance and the risk of errors being repeated in identical

maintenance tasks are minimised;

(4)damage is assessed, and modifications and repairs are carried out using the data specified

in point M.A.304 of Annex I (Part-M) or point ML.A.304 of Annex Vb (Part-ML), as applicable;

(5)the assessment of aircraft defects is carried out in accordance with point M.A.403(b) of

Annex I (Part-M) or ML.A.403(b) of Annex Vb (Part-ML), as applicable.

Quoted word for word from Regulation (EU) No 1321/2014, Easy Access Rules for Continuing Airworthiness, 2 Sep 2025 revision.