[state] Part 6 — Approved Maintenance Organisation



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6.1General

6.1.1.1Applicability


Part 6 prescribes the requirements for issuing approvals to organisations for the maintenance preventive maintenance, and alterations of aircraft and aeronautical products and prescribes the general operating rules for an Approved Maintenance Organisation (AMO).

6.1.1.2Definitions



Definitions are contained in MCAR Part 1.

6.1.1.3Abbreviations

The following abbreviations are used in Part 6.



      1. AAT – Approved Airworthiness Tag

      2. AMO – Approved Maintenance Organisation.

      3. AMT – Aviation Maintenance Technician

      4. ARS – Aviation Repairman Specialist

      5. NDT – Non-Destructive Testing

      6. PAH - Production Approval Holder

      7. TSO – Technical Standard Order

6.1.1.4Exemption Authority

The Authority may, upon consideration of the circumstances of a particular maintenance organisation, issue an exemption providing relief from specified sections of this Part, provided that the Authority finds that the circumstances presented warrant the exemption and that a level of safety will be maintained equal to that provided by the rule from which the exemption is sought.

An exemption may be terminated or amended at any time by the Authority.

A request for exemption must be made in accordance with the requirements in Part 1.

Each approved maintenance organisation that receives an exemption must have a means of notifying the appropriate management, certifying staff, and personnel of the exemption.

6.2Certification of a Maintenance Organisation and Continued Validity

6.2.1.1Applicability

This section prescribes the requirements for the certification of a maintenance organisation and continued validity of the certificate.


6.2.1.2General

No person may operate as a certificated approved maintenance organisation without, or in violation of, an approved maintenance organisation certificate, ratings or operations specifications issued under this part.

The certificate and operations specifications issued to an approved maintenance organisation must be available on the premises for inspection by the public and the Authority.

The approval of an AMO by a State shall be dependent upon the applicant demonstrating compliance with the requirements of this part and the safety management requirements of MCAR 1.



Annex 6 Part 1: 8.7.1.1, 14 CFR: 145.5

ICAO Annex 19: 4.1.2

6.2.1.3Approved Maintenance Organisation Certificate

The AMO certificate will consist of two documents—



      1. A one page certificate signed by the Authority; and

      2. A multi-page operations specifications signed by the Accountable Manager and the Authority containing the terms, conditions, and authorisations.

No person may operate as an approved maintenance organisation without, or in violation of, an approved maintenance organisation certificate issued under this Part.

An approved maintenance organisation may perform maintenance, preventive maintenance, or alterations on an aircraft, airframe, aircraft engine, propeller, appliance, component, or part thereof only for which it is rated and within the terms, conditions, and authorisations placed in its operations specifications.

The AMO certificate will contain the following items and be in a format as shown in IS: 6.2.1.3—


      1. The certificate number specifically assigned to the AMO;

      2. The name and location (main place of business) of the AMO;

      3. The date of issue and period of validity;

      4. The ratings issued to the AMO; and

      5. Authority signature.

The AMO operations specifications will contain—

      1. The certificate number specifically assigned to the AMO;

      2. The class or limited ratings issued in detail, including special approvals and limitations issued;

      3. The date issued or revised;

      4. Accountable manager and Authority signatures; and

      5. The certificate issued to each certificated maintenance organisation must be available in the premises for inspection by the public and the Authority.

ICAO Annex 6: Part I: 8.7.1.1; 8.7.1.2; 8.7.1.3

14 CFR: 145.5

6.2.1.4Advertising

No approved maintenance organisation may advertise as a certificated approved maintenance organisation until an approved maintenance organisation certificate has been issued to that facility.

No certificated approved maintenance organisation may make any statement, either in writing or orally, about itself that is false or is designed to mislead any person.

Whenever the advertising of an approved maintenance organisation indicates that it is certificated, the advertisement must clearly state the approved maintenance organisation’s certificate number.



Previous version of 14 CFR: 145.25

6.2.1.5Application for an AMO Certificate

The Authority will require an applicant for approval of a maintenance organisation to submit the following—



      1. An application in a form and a manner prescribed by the Authority, as contained in IS: 6.2.1.5;

      2. Its Maintenance Procedures Manual in duplicate;

      3. A list of the maintenance functions to be performed for it, under contract, by another AMO;

      4. A list of all AMO certificates and ratings pertinent to those certificates issued by any contracting State other than [STATE];

      5. Documentation of the maintenance organisation’s Quality System; and

      6. Any additional information the Authority requires the applicant to submit.

An application for the amendment of an existing AMO certificate shall be made on a form and in a manner prescribed by the Authority. If applicable, the AMO shall submit the required amendment to the Maintenance Procedures Manual to the Authority for approval.

Note 1: "In a form" and "in a manner" mean that a form issued by the Authority should be completed by the accountable manager, or the manager’s nominee designated in accordance with 6.2.1.5(a).

Note 2: The contents of the maintenance procedures manual is contained in 6.5.1.1.

Note 3: ICAO Doc. 9642, Part 4, 2.9 states that it is accepted practice to permit AMOs to subcontract work to non-approved maintenance organisations if the contracting AMO is (1) approved for the work to be subcontracted and has the ability to assess the competency of the subcontractor, (2) retains the responsibility for the quality control and release of subcontracted activities, and (3) there exist procedures to control subcontracted activities together with terms of reference for the personnel responsible for their management.

Note 4: The requirement for listing AMO certificates, above, supports the application by [STATE] of the following Articles of the Chicago Convention: Article 33 - Recognition of Certificates and Licences; Article 37(d) - Adoption of International Standards and Procedures; Article 39(b) - Endorsement of Certificates and Licences; and Article 40 - Validity of Endorsed Certificates and Licences.

ICAO Annex 6, Part 1; 8.7.2.1

14 CFR: 145.51

JAR: 145.15

6.2.1.6Issuance of an AMO Certificate

An applicant may be issued an AMO certificate if, after investigation, the Authority finds that the applicant—

Meets the applicable regulations and standards for an AMO certificate, and

Is properly and adequately equipped for the performance of maintenance of aircraft or aeronautical product for which it seeks approval.



Note: If, under national law, any charges are to be prescribed by the Authority for the AMO application process, that requirement should be set forth in this section.

ICAO Annex 6, Part I: 8.7.1.1

14 CFR: 145.53

JAR: 145.15

6.2.1.7Duration and Renewal of AMO Certificate

A certificate or rating issued to an approved maintenance organisation located either inside or outside the [STATE] is effective from the date of issue until—



      1. The 12th month after the date on which it was initially issued, subject to satisfactory compliance with the requirements of this Part; or

      2. The 24th month after the date on which it was renewed, subject to satisfactory compliance with the requirements of this Part; or

      3. The approved maintenance organisation surrenders the certificate, or

      4. The Authority suspends or revokes the certificate.

The holder of a certificate that expires or is surrendered, suspended, or revoked by the Authority must return the certificate and operations specifications to the Authority within 5 working days of expiration, surrender or receipt from the Authority of notice of suspension or revocation.

A certificated approved maintenance organisation that applies for a renewal of its approved maintenance organisation certificate for aircraft registered in [STATE] must submit its request for renewal no later than 90 days before the approved maintenance organisation’s current certificate expires. If a request for renewal is not made within this period, the approved maintenance organisation must follow the application procedures for initial issuance as prescribed by the Authority.



ICAO Annex 6, Part I: 8.7.1.1; 8.7.1.2

14 CFR: 145.55

6.2.1.8Continued Validity of Approval

Unless the approval has previously been surrendered, superseded, suspended, revoked or expired by virtue of exceeding any expiration date that may be specified in the approval certificate, the continued validity of approval is dependent upon—



      1. The AMO remaining in compliance with this Part;

      2. The Authority being granted access to the organisation’s facilities to determine continued compliance with this regulation; and

      3. The payment of any charges prescribed by the Authority

ICAO Annex 6, Part I: 8.7.1.3

14 CFR: 145.557

6.2.1.9Inspection

The Authority may, at any time, inspect an AMO holder on the AMO holder’s premises to determine the AMO compliance with this Part.

Inspections will be conducted at least annually.

After an inspection is made, the certificate holder will be notified, in writing, of any deficiencies found during the inspection.

Inspection will also be performed on the applicant for, or the holder of an AMO certificate held outside the authorising [STATE]. This inspection may be delegated to the Authority of the State where the AMO is located, provided an arrangement exists.

14 CFR 145.223

6.2.1.10Suspension or Revocation

The Authority may suspend or revoke an AMO certificate if it is established that a certificate holder has not met, or no longer meets the requirements of Part 6.



ICAO Annex 6, Part 1: 8.7.1.1; 8.7.1.2

14 CFR 145.55

6.2.1.11Changes to the AMO and Certificate Amendments

To enable the Authority to determine continued compliance with this Part, the AMO shall provide written notification to the Authority either prior to, or within a time period determined by the Authority to be as soon as practicable after, any of the following changes—



      1. The name of the organisation;

      2. The location of the organisation;

      3. The housing, facilities, equipment, tools, material, procedures, work scope and certifying staff that could affect the AMO rating or ratings;

      4. The ratings held by the AMO, whether granted by the Authority or held through an AMO certification issued by another contracting State;

Note: See subsection 6.2.1.5(a).

      1. Additional locations of the organisation;

      2. Items in the Maintenance Procedures Manual,

      3. The accountable manager; or

      4. The list of management personnel identified as described in the Maintenance Procedures Manual.

The Authority will amend the AMO certificate if the AMO notifies the Authority of a change in—

      1. Location or housing and facilities;

      2. Additional locations of the organisation;

      3. Rating, including deletions;

      4. Items in the Maintenance Procedures Manual

      5. Name of the organisation with same ownership; or

      6. Ownership.

The Authority may amend the AMO certificate if the AMO notifies the Authority of a change in—

      1. The accountable manager; or

      2. The list of management personnel identified as described in the Maintenance Procedure Manual.

      3. Items in the Maintenance Procedures Manual,

When the Authority issues an amendment to an AMO certificate because of new ownership of the AMO, the Authority will assign a new certificate number to the amended AMO certificate.

The Authority may—



      1. Prescribe, in writing, the conditions under which the AMO may continue to operate during any period of implementation of the changes noted in subparagraph (a); and

      2. Hold the AMO certificate in abeyance if the Authority determines that approval of the AMO certificate should be delayed; the Authority will notify the AMO certificate holder, in writing, of the reasons for any such delay.

If changes are made by the AMO to the items listed in subparagraph (a) without notification to the Authority and amendment of the AMO certificate by the Authority, the AMO certificate may be suspended, or revoked, by the Authority.

14 CFR: 145.57; 145.105

JAR: 145.85

Annex 6 Part 1 Chapter 8: 8.7.2.2, 8.7.2.3

6.2.1.12Ratings of the AMO

The following ratings are issued under this Subpart—



      1. Airframe ratings.

        1. Class 1: Composite construction of small aircraft.

        2. Class 2: Composite construction of large aircraft.

        3. Class 3: All-metal construction of small aircraft.

        4. Class 4: All-metal construction of large aircraft.

      2. Powerplant ratings.

        1. Class 1: Piston engines of 400 horsepower or less.

        2. Class 2: Piston engines of more than 400 horsepower.

        3. Class 3: Turbine engines.

      3. Propeller ratings.

        1. Class 1: Fixed-pitch and ground-adjustable propellers of wood, metal or composite construction.

        2. Class 2: Other propellers, by make.

      4. Avionics/radio ratings.

        1. Class 1: Communication equipment: Radio transmitting equipment or receiving equipment, or both, used in aircraft to send or receive communications, regardless of carrier frequency or type of modulation used; including auxiliary and related aircraft interphone systems, amplifier systems, electrical or electronic inter-crew signaling devices, and similar equipment; but not including equipment used for navigation of the aircraft or as an aid to navigation, equipment for measuring altitude or terrain clearance, other measuring equipment operated on radio or radar principles, or mechanical, electrical, gyroscopic, or electronic instruments that are a part of communications radio equipment.

        2. Class 2: Navigational equipment: A radio system used in aircraft for en-route, approach navigation, to include the flight director system, except equipment operated on radar or pulsed radio frequency principles, but not including equipment for measuring altitude or terrain clearance or other distance measuring equipment operated on pulsed radio frequency principles.

        3. Class 3: Pulsed equipment: Any aircraft electronic system operated on pulsed radio frequency principles.

      5. Instrument ratings.

        1. Class 1: Mechanical: Any diaphragm, bourdon tube, aneroid, optical, or mechanically driven centrifugal instrument that is used on aircraft or to operate aircraft, including tachometers, airspeed indicators, pressure gauges, drift sights, magnetic compasses, altimeters, or similar mechanical instruments.

        2. Class 2: Electrical: Any self-synchronous and electrical indicating instruments and systems, including remote indicating instruments, cylinder head temperature gauges, or similar electrical instruments.

        3. Class 3: Gyroscopic: Any instrument or system using gyroscopic principles and motivated by air pressure or electrical energy, including automatic pilot control units, turn and bank indicators, directional gyros, and their parts, and flux gate and gyrosyn compasses.

        4. Class 4: Electronic: Any instruments whose operation depends on electron tubes, transistors, electronic displays, or similar devices including capacitance type quantity gauges, system amplifiers, and engine analysers.

      6. Accessory ratings.

        1. Class 1: Mechanical. The accessories that depend on friction, hydraulics, mechanical linkage, or pneumatic pressure for operation, including aircraft brakes, mechanically driven pumps, carburetors, aircraft wheel assemblies, shock absorber struts and hydraulic servo units.

        2. Class 2: Electrical. The accessories that depend on electrical energy for operation, and generators, including starters, voltage regulators, electric motors, electrically driven fuel pumps, magnetos, or similar electrical accessories

        3. Class 3: Electronic. The accessories that depend on the use of an electron tube transistors, or similar device, including supercharger, temperature, air conditioning controls, or similar electronic controls.

14 CFR: 145.59

EASA 145: Appendix II

6.2.1.13AMO Limited Ratings

Whenever the Authority finds it appropriate, it may issue a limited rating to an AMO that maintains or alters only a particular type of airframe, powerplant, propeller, radio, instrument, or accessory, or parts thereof, or performs only specialised maintenance requiring equipment and skills not ordinarily found in an AMO. Such a rating may be limited to a specific model aircraft, engine, or constituent part, or to any number of parts made by a particular manufacturer.

Limited ratings are issued for—


      1. Airframes of a particular make and model;

      2. Powerplants of a particular make and model;

      3. Propellers of a particular make and model;

      4. Radio equipment of a particular make and model;

      5. Instruments of a particular make and model;

      6. Accessories of a particular make and model;

      7. Landing gear components;

      8. Floats, by make;

      9. Nondestructive inspection, testing, and processing;

      10. Emergency equipment;

      11. Rotor blades, by make and model;

      12. Aircraft fabric work; and

      13. Any other purpose for which the Authority finds the applicant’s request appropriate.

Specialised service ratings. A specialised service rating may be issued to a maintenance organisation to perform specific maintenance or processes. The operating specifications of the approved maintenance organisation must identify the specification used in performing that specialised service. The specification may be—

      1. A civil or military specification that is currently used by industry and approved by the Authority; or

      2. A specification developed by the approved maintenance organisation and approved by the Authority.

14 CFR: 145.61

EASA 145: Appendix II

6.2.1.14Quality System

The AMO shall establish a quality system and designate a quality manager to monitor compliance with, and adequacy of, procedures required to ensure safe maintenance practices and airworthy aircraft. Compliance monitoring shall include a feedback system to the accountable manager to ensure corrective action as necessary.

The quality system, and the quality manager, shall be acceptable to the Authority.

Each AMO shall ensure that the quality system includes a quality assurance programme that contains procedures designed to monitor compliance with required aircraft and aircraft component standards and adequacy of the procedures to ensure that such procedures invoke good maintenance practices and airworthy aircraft and aircraft components.

The quality assurance system shall include a procedure to initially qualify and periodically perform audits on persons performing work on behalf of the AMO.

The quality system shall include a feedback system to the designated management person or group of persons directly responsible for the quality system and ultimately to the accountable manager that ensures, as necessary, proper and timely corrective action is taken in response to reports resulting from the independent audits.

The AMO’s quality system shall be sufficient to review all maintenance procedures, as described in the Maintenance Control Manual and the Maintenance Procedures Manual, in accordance with an approved programme once a year.

The AMO’s quality system shall indicate when audits are due, when completed, and establish a system of audit reports, which can be seen by visiting Authority staff on request. The audit system shall clearly establish a means by which audit reports containing observations about non-compliance or poor standards are communicated to the accountable manager.

If the AMO is a small organisation, the independent audit part of the quality system may be contracted to another organisation approved under this part or a person with appropriate technical knowledge and proven satisfactory audit experience such as ISO 9000 qualification.

Where the AMO is part of an AOC under Part 9, the AOC holder’s quality management system may be combined with the requirements of an AMO and submitted for acceptance to the Authority.

Each AMO shall describe the quality system in relevant documentation as outlined in IS: 6.2.1.12.

Note: Where the AMO is part of an AOC under Part 9, see IS: 9.2.2.3 for examples of a combined quality system.

ICAO Annex 6: Part 1, 8.7.3.2

FAA AC 145-9

JAR: 145.65

6.2.1.15Location of the AMO


    1. Principal place of business. An applicant for, or holder of, a certificated AMO under this Part shall establish and maintain a principal place of business office that is physically located at the address shown on its certificate.

    2. Additional fixed locations. An AMO may have additional fixed locations without certificating each facility as a stand-alone AMO, which may be approved by the Authority provided that –

      1. All of the facilities are localised and within a defined area, and

      2. All locations operate under the approval of the AMO certificate and operations specifications.

    3. Foreign locations of AMOs. An AMO approved by the Authority may be located in a country outside [STATE] and is subject to all the applicable requirements of this Part.

FAA Order 8900.1, Vol. 2, Chapter 11, Section 1

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