145.A.45 Maintenance data

SI No. 588/2023

(a) The organisation must 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 must 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 must 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 must demonstrate that they result in equivalent or improved maintenance standards, and must inform the author of the maintenance instructions of such changes. For the purposes of this point, “maintenance instructions” means instructions on how to carry out a particular maintenance task; they exclude the engineering design of repairs and modifications.

(e) The organisation must provide a common work card or worksheet system to be used throughout the relevant parts of the organisation. In addition, the organisation must 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. Work cards and worksheets may be computer generated and held in an electronic database that is adequately protected against unauthorised alteration, and for which there is a backup electronic database which must be updated within 24 hours after an entry is made to the main electronic database. Complex or long maintenance tasks must be transcribed onto the work cards or worksheets and subdivided into clear stages to ensure that there is a record of the accomplishment of the complete maintenance task. When the organisation provides maintenance services to an aircraft operator which requires its own work card or 42 worksheet system to be used, then such work card or worksheet system may be used. In that case, the organisation must establish a procedure to ensure that those work cards or worksheets are correctly completely.

(f)  The organisation shall ensure that all applicable maintenance data is readily available for use when required by maintenance personnel.

(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.