Airworthiness Manual Chapter 523 Appendix A - Instructions for Continued Airworthiness

Canadian Aviation Regulations (CARs)

Content last revised: 2021/09/21

Legacy sections

  • 523.1301-1 - Aeroplane Operation After Ground Cold Soak
  • 523.1457 - Cockpit Voice Recorders
  • 523.1459 - Flight Data Recorders
  • 523.1529 - Instructions for Continued Airworthiness


  • A (523.2000-523.2010),
  • B (523.2100-523.2165),
  • C (523.2200-523.2270),
  • D (523.2300-523.2335),
  • E (523.2400-523.2440),
  • F (523.2500-523.2550),
  • G (523.2600-523.2620)



Appendix A

Instructions for Continued Airworthiness

A523.1 General

  • (a) This appendix specifies requirements for the preparation of Instructions for Continued Air worthiness as required by this chapter.
  • (b) The Instructions for Continued Airworthiness for each aeroplane must include the Instructions for Continued Airworthiness for each engine and propeller (hereinafter designated 'products'), for each appliance required by this manual, and any required information relating to the interface of those appliances and products with the aeroplane. If Instructions for Continued Airworthiness are not supplied by the manufacturer of an appliance or product installed in the aeroplane, the Instructions for Continued Airworthiness for the aeroplane must include the information essential to the continued airworthiness of the aeroplane.
  • (c) The applicant must submit to the Minister a program to show how changes to the Instructions for Continued Airworthiness made by the applicant or by the manufacturers of products and appliances installed in the aeroplane will be distributed.

(effective 2021/09/21)

A523.2 Format

  • (a) The Instructions for Continued Airworthiness must be in the form of a manual or manuals as appropriate for the quantity of data to be provided.
  • (b) The format of the manual or manuals must provide for a practical arrangement.

(effective 2021/09/21)

A523.3 Content

The Instructions for Continued Air worthiness must contain the following manuals or sections and information:

  • (a) Aeroplane maintenance manual or section.
    • (1) Introduction information that includes an explanation of the aeroplane's features and data to the extent necessary for maintenance or preventive maintenance.
    • (2) A description of the aeroplane and its systems and installations including its engines, propellers, and appliances.
    • (3) Basic control and operation information describing how the aeroplane components and systems are controlled and how they operate, including any special procedures and limitations that apply.
    • (4) Servicing information that covers details regarding servicing points, capacities of tanks, reservoirs, types of fluids to be used, pressures applicable to the various systems, location of access panels for inspection and servicing, locations of lubrication points, lubricants to be used, equipment required for servicing, tow instructions and limitations, mooring, jacking, and levelling information.
  • (b) Maintenance Instructions.
    • (1) Scheduling information for each part of the aeroplane and its engines, auxiliary power units, propellers, accessories, instruments, and equipment that provides the recommended periods at which they should be cleaned, inspected, adjusted, tested, and lubricated, and the degree of inspection, the applicable wear tolerances, and work recommended at these periods. However, the applicant may refer to an accessory, instrument, or equipment manufacturer as the source of this information if the applicant shows that the item has an exceptionally high degree of complexity requiring specialised maintenance techniques, test equipment, or expertise. The recommended overhaul periods and necessary cross reference to the Airworthiness Limitations section of the manual must also be included. In addition, the applicant must include an inspection program that includes the frequency and extent of the inspections necessary to provide for the continued airworthiness of the aeroplane.
    • (2) Troubleshooting information describing probable malfunctions, how to recognise those malfunctions, and the remedial action for those malfunctions.
    • (3) Information describing the order and method of removing and replacing products and parts with any necessary precautions to be taken.
    • (4) Other general procedural instructions including procedures for system testing during ground running, symmetry checks, weighing and determining the centre of gravity, lifting and shoring, and storage limitations.
  • (c) Diagrams of structural access plates and information needed to gain access for inspections when access plates are not provided.
  • (d) Details for the application of special inspection techniques including radiographic and ultrasonic testing where such processes are specified.
  • (e) Information needed to apply protective treatments to the structure after inspection.
  • (f) All data relative to structural fasteners such as identification, discard recommendations, and torque values.
  • (g) A list of special tools needed.
  • (h) In addition, for level 4 aeroplanes, the following information must be furnished:
    • (1) Electrical loads applicable to the various systems;
    • (2) Methods of balancing control surfaces;
    • (3) Identification of primary and secondary structures; and
    • (4) Special repair methods applicable to the aeroplane.

(effective 2021/09/21)

A523.4 Airworthiness Limitations Section

The Instructions for Continued Airworthiness must contain a section titled Airworthiness Limitations that is segregated and clearly distinguishable from the rest of the document. This section must set forth each mandatory replacement time, structural inspection interval, and related structural inspection procedure required for type certification. If the Instructions for Continued Airworthiness consist of multiple documents, the section required by this paragraph must be included in the principal manual. This section must contain a legible statement in a prominent location that reads: "The Airworthiness Limitations section is approved by the Minister and specifies maintenance required under any applicable airworthiness or operating rule, unless an alternative program has been approved by the Minister".

(effective 2021/09/21)