Part V - Airworthiness Manual Chapter 525 - Transport Category Aeroplanes

Canadian Aviation Regulations (CARs) 2017-2

Content last revised: 2012/06/01



  • A (525.1-525.2), 
  • B (525.21-525.255), 
  • C (525.301-525.581), 
  • D (525.601-525.899), 
  • E (525.901-525.1207), 
  • F (525.1301-525.1461), 
  • G (525.1501-525.1587)
  • H (525.1701-525.1733)


A, B, C, D, E, F, G, H, I, J, L, M, N

(2001/06/01; no previous version)


Instructions For Continued Airworthiness

H525.1 General
  1. (a) This appendix specifies requirements for preparation of Instructions for Continued Airworthiness as required by 525.1529, 525.1729 and applicable provisions of Part V of the Canadian Aviation Regulations (CARs).
    (amended 2009/05/11)

  2. (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 any applicable airworthiness or operating rule, 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.

  3. (c) The applicant must submit to the Minister a programme 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.

H525.2 Format
  1. (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.

  2. (b) The format of the manual or manuals must provide for a practical arrangement.

H525.3 Content

The Instructions for Continued Airworthiness must contain the following manuals or sections, as appropriate, and information:

  1. (a) Aeroplane maintenance manual or section.

    1. (1) Introduction information that includes an explanation of the aeroplane's features and data to the extent necessary for maintenance or preventive maintenance.

    2. (2) A description of the aeroplane and its systems and installations including its engines, propellers, and appliances.

    3. (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. (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.

  2. (b) Maintenance Instructions.

    1. (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 references 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. (2) Troubleshooting information describing probable malfunctions, how to recognise those malfunctions, and the remedial action for those malfunctions.

    3. (3) Information describing the order and method of removing and replacing products and parts with any necessary precautions to be taken.

    4. (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.

  3. (c) Diagrams of structural access plates and information needed to gain access for inspections when access plates are not provided.

  4. (d) Details for the application of special inspection techniques including radiographic and ultrasonic testing where such processes are specified.

  5. (e) Information needed to apply protective treatments to the structure after inspection.

  6. (f) All data relative to structural fasteners such as identification, discard recommendations, and torque values.

  7. (g) A list of special tools needed.

H525.4 Airworthiness Limitations Section
  1. (a) 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:
    (amended 2009/05/11)

    1. (1) Each mandatory modification time, replacement time, structural inspection interval, and related structural inspection procedure approved under 525.571;
      (amended 2012/03/27)  

    2. (2) Each mandatory replacement time, inspection interval, related inspection procedure, and all critical design configuration control limitations approved under 525.981 for the fuel tank system; and

    3. (3) Any mandatory replacement time of EWIS components as defined in section 525.1701.
      (amended 2009/05/11; no previous version)

    4. (4) A limit of validity (LOV) of the engineering data that supports the structural maintenance program, stated as a total number of accumulated flight cycles or flight hours or both, approved under 525.571. Until the full-scale fatigue testing is completed and the Minister has approved the LOV, the number of cycles accumulated by the aeroplane cannot be greater than ½ the number of cycles accumulated on the fatigue test article.
      (amended 2012/03/27; no previous version)

  2. (b) If the Instructions for Continued Airworthiness consist of multiple documents, the section required by H525.4(a) above shall 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 by any applicable airworthiness or operating rule, unless an alternative program has been approved by the Minister."
    (amended 2002/08/19)

H525.5 Electrical Wiring Interconnection System (EWIS) Instructions for Continued Airworthiness
(amended 2009/05/11; no previous version)
  1. (a) The applicant must prepare Instructions for Continued Airworthiness (ICA) applicable to EWIS as defined by 525.1701 that are approved by the Minister and include the following:
    (amended 2009/05/11; no previous version)

    1. (1) Maintenance and inspection requirements for the EWIS developed with the use of an enhanced zonal analysis procedure that includes:
      (amended 2009/05/11; no previous version)

      1. (i) Identification of each zone of the aeroplane.
        (amended 2009/05/11; no previous version)

      2. (ii) Identification of each zone that contains EWIS.
        (amended 2009/05/11; no previous version)

      3. (iii) Identification of each zone containing EWIS that also contains combustible materials. (amended 2009/05/11; no previous version)

        (iv) Identification of each zone in which EWIS is in close proximity to both primary and back-up hydraulic, mechanical or electrical flight controls and lines.
        (amended 2009/05/11; no previous version)

      4. (v) Identification of:
        (amended 2009/05/11; no previous version)

        1. (A) Tasks, and the intervals for performing those tasks, that will reduce the likelihood of ignition sources and accumulation of combustible material, and
          (amended 2009/05/11; no previous version)

        2. (B) Procedures, and the intervals for performing those procedures, that will effectively clean the EWIS components of combustible material if there is not an effective task to reduce the likelihood of combustible material accumulation.
          (amended 2009/05/11; no previous version)

          (vi) Instructions for protection and caution information that will minimize contamination and accidental damage to EWIS, as applicable, during performance of maintenance, alteration or repairs.
          (amended 2009/05/11; no previous version)

      5. (2) Acceptable EWIS maintenance practices in a standard format.
        (amended 2009/05/11; no previous version)

      6. (3) Wire separation requirements as determined under 525.1707.
        (amended 2009/05/11; no previous version)

      7. (4) Information explaining the EWIS identification method and requirements for identifying any changes to EWIS under 525.1711.
        (amended 2009/05/11; no previous version)

      8. (5) Electrical load data and instructions for updating that data.
        (amended 2009/05/11; no previous version)

    2. (b) The EWIS ICA developed in accordance with the requirements of H525.5(a)(1) must be in the form of a document appropriate for the information to be provided, and they must be easily recognizable as EWIS ICA. This document must either contain the required EWIS ICA or specifically reference other portions of the ICA that contain this information.
      (amended 2009/05/11; no previous version)

      (Change 525-2 (89-01-01))

      (Change 525-3 (91-11-01))

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