Subpart D - Aircraft Records

39.73 Maintenance and continued airworthiness records

(a) The owner or, where it is leased the lessee, of an aircraft or the holder of an air operator’s certificate shall make provision for the retention of aircraft engine and propeller log books recording at least the following:

(1) maintenance records; and

(2) airworthiness records of compliance with airworthiness directives and scheduled maintenance requirements; and

(3) records of modifications and repairs; and

(4) life component records.

(b) Maintenance records shall be of sufficient detail to establish the full content of the maintenance activity undertaken and shall include all relevant supporting information, such as component replacement service life records.

(c) Records shall be of sufficient detail to demonstrate the airworthiness status of the aircraft at all times and shall include:

(1) a description of maintenance tasks including references to the applicable approved technical data; and

(2) the date of completion of all scheduled maintenance tasks and reference to the approved maintenance programme; and

(3) the signature, and authorisation reference of the person certifying the aircraft for return to service; and

(4) the total time in service by the specified time control basis of the airframe, each engine, each propeller, and each rotor and installed equipment; and

(5) the current status of lifed parts/components of each airframe, engine, propeller, rotor and appliance with referenced to the specified time interval basis required by paragraph 39.61(h)(3); and

(6) the time since last overhaul of all items installed on the aircraft which are required to be overhauled on a specified time basis; and

(7) the current maintenance status of the aircraft, including the time since the last inspection required by the maintenance programme under which the aircraft is maintained; and

(8) the current status of each applicable airworthiness directive including:

(i) the airworthiness directive number; and

(ii) the revision date; and

(iii) the means of compliance; and

(iv) and if the airworthiness directive involves recurring action, the time and date when the next action is required; and

(9) a list of all design changes and repairs to each airframe, engine, propeller, rotor and appliance including substantiation data required by OTAR Part 21.73; and

(10) a record of all airframe damage that shows each damage site with a reference to a certified assessment to approved data supporting continued aircraft operation; and

(11) a record of any defects or maintenance activities requiring rectification action to restore the aircraft to an airworthy condition.

(d) The records shall be kept in hard copy form or in electronic coded form provided that this form allows for the preservation and retrieval of information in a manner acceptable to the Governor.

(e) Any additional worksheets, documents, technical logs or other documentation associated with the maintenance of the aircraft shall be referenced in the relevant log books and will become part of the maintenance records for retention of records purposes.

39.75 Retention of records

(a) The owner, or where it is leased the lessee, of an aircraft or the holder of an air operator’s certificate shall retain maintenance and continued airworthiness records as follows:

(1) for a minimum period of 12 months after the unit to which they refer has been permanently withdrawn from service:

(i) the total time in service (hours, calendar time and cycles, as appropriate) of the aeroplane and all life-limited components; and

(ii) the current status of compliance with all mandatory continuing airworthiness information; and

(iii) appropriate details of modifications and repairs; and

(iv) the time in service (hours, calendar time and cycles, as appropriate) since the last overhaul of the aeroplane or its components subject to a mandatory overhaul life; and

(v) the current status of the aeroplane’s compliance with the maintenance programme.

(2) for all detailed maintenance records in respect of the aircraft and any service life-limited component fitted thereto, not less than 24 months after the aircraft been released to service in respect of that maintenance or until the information contained therein is superseded by new information equivalent in scope and detail, whichever is the longer time.

(3) the current status of compliance with the maintenance programme; such that compliance with the approved aircraft maintenance programme can be established, at least until the aircraft or component scheduled maintenance has been superseded by other scheduled maintenance of equivalent work scope and detail.

(b) The owner, or where it is leased the lessee, of an aircraft or the holder of an air operator’s certificate required by paragraph 39.79(a) to provide a Technical Log shall ensure that arrangements are established for the subsequent transmittal of sector record pages to the organisation responsible for the continued airworthiness of the aircraft.

39.77 Transfer of maintenance records

(a) Each holder of a Territory Certificate of Registration for an aircraft transferring registration to another person under OTAR Part 47 shall, at the time of transfer of registration, transfer to that person all relevant maintenance records and records of continued airworthiness.

(b) In the event of a temporary change of operator, the relevant maintenance records and records of continued airworthiness shall be made available to the new operator.

39.79 Technical log

(a) The holder of an air operator’s certificate, owner or, where it is leased the lessee, of an aircraft above 2,700 kg MTOM or turbine powered shall provide a technical log for the aircraft which has provision for recording at least the following, as applicable:

(1) the name of the operator; and

(2) the registration and designation of the aircraft; and

(3) record of aircraft utilisation including total time (daily, hours, cycles sectors) as applicable; and

(4) records of fuel and oil; and

(5) the maintenance status of the aircraft, the identity of the next scheduled inspection, including date/hours/cycles at which any other out of phase maintenance/inspection is required; and

(6) any defects or abnormal occurrences found by the pilot during or following a flight; and details of rectification of defects occurring between scheduled inspections including the certificate of release to service for any rectification; and

(7) details of any deferred rectification including any inoperative equipment with which the aircraft is permitted to be flown under the applicable OTAR Parts relating to the operation of the aircraft; and

(8) records for special operations such as AWOPs and ETOPs; and

(9) the information required by the applicable OTAR Parts relating to the operation of the aircraft; and

(10) the time when ground de-icing and/or anti-icing was started and the type of fluid applied, including fluid/water mixture ratio; and

(11) the time spent in particular engine power ranges where the use of such engine power affects the life of the engine or engine module; and

(12) the number of landings where landings affect the life of an aircraft or aircraft component; and

(13) flight pressure cycles where such cycles affect the life of an aircraft of aircraft component.

(b) The content of the Technical Log may be altered from that in paragraph 39.79(a) if alternative methods of recording this data acceptable to the Governor are used.

(c) The Technical Log shall be kept in hard copy form or in electronic coded form provided that this form allows for the preservation and retrieval of information in a manner acceptable to the Governor.

39.81 Mass and Balance

(a) An aircraft is to be weighed:

(1) at intervals not exceeding 5 years or, where the aircraft is part of an operator’s fleet weighing programme accepted by the Governor, at intervals specified by that programme; and

(2) whenever alterations affecting mass and balance of the aircraft are made that exceed the limits for computed mass and balance changes advised by the aircraft type certificate holder.

(b) Records of aircraft mass and balance shall be maintained in a manner acceptable to the Governor and reflect the modification and repair status by:

(1) calculations where approved data is available for incorporated design changes; and

(2) by periodic weighing of aircraft as prescribed in the applicable approved aircraft maintenance programme.

(c) The basic record of aircraft empty mass shall be that defined by the Type Certificate holder and any approved configuration.

(d) Any item installed not forming part of the Type Design shall be entered in an equipment list with its associated weight and moment and shall constitute part of the aircraft’s mass and balance report.

(e) Following any change made to the empty mass of the aircraft or its centre of gravity, an entry shall be made in the aircraft log book or other aircraft record acceptable to the Governor before the next flight and shall include details of:

(1) the change; and

(2) the effective date of the change; and

(3) the weight and moment arm of each item installed or removed.

(f) Subject to the requirement of paragraph 39.81(b) the particulars of any changes to the empty mass of the aircraft shall be transcribed into the aircraft’s empty weight and balance report.

39.83 Alternative configurations

Where an aircraft is operated in more than one configuration, a separate mass and balance report shall be provided for each configuration and shall contain:

(a) details of the differences from the basic aircraft configuration; and

(b) the empty mass and centre of gravity for the configuration; and

(c) the approved modification details supporting the configuration.

39.85 Certification

(a) All mass and balance reports shall be certified by an authorised person responsible for compiling the report.

(b) Alternative configurations and changes made to the aircraft empty mass shall be certified with an appropriate maintenance release recording:

(1) where applicable the specific configuration; and

(2) details of the approved modification; and

(3) the amendment made to the aircraft’s empty mass and balance report.


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