Part V - Airworthiness Manual Chapter 525 - Transport Category Aeroplanes

Canadian Aviation Regulations (CARs) 2017-3

Content last revised: 2009/06/30

Preamble

SUBCHAPTERS

  • 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)

APPENDICES

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

(amended 2009/05/11)

APPENDIX M

Fuel Tank System Flammability Reduction Means
(amended 2009/05/11)

M525.1 Fuel Tank Flammability Exposure Requirements
(amended 2009/05/11)
  1. (a) The Fleet Average Flammability Exposure of each fuel tank, as determined in accordance with AppendixN of this chapter, may not exceed 3percent of the Flammability Exposure Evaluation Time(FEET), as defined in AppendixN of this chapter. As a portion of this 3percent, if flammability reduction means(FRM) are used, each of the following time periods may not exceed 1.8percent of the FEET:
    (amended 2009/05/11)

    1. (1) When any FRM is operational but the fuel tank is not inert and the tank is flammable; and
      (amended 2009/05/11)

    2. (2) When any FRM is inoperative and the tank is flammable.
      (amended 2009/05/11)

  2. (b) The Fleet Average Flammability Exposure, as defined in AppendixN of this chapter, of each fuel tank may not exceed 3percent of the portion of the FEET occurring during either ground or takeoff/climb phases of flight during warm days. The analysis must consider the following conditions.
    (amended 2009/05/11)

    1. (1) The analysis must use the subset of those flights that begin with a sea level ground ambient temperature of 80°F (standard day plus 21°F atmosphere) or above, from the flammability exposure analysis done for overall performance.
      (amended 2009/05/11)

    2. (2) For the ground and takeoff/climb phases of flight, the average flammability exposure must be calculated by dividing the time during the specific flight phase the fuel tank is flammable by the total time of the specific flight phase.
      (amended 2009/05/11)

    3. (3) Compliance with this paragraph may be shown using only those flights for which the aeroplane is dispatched with the flammability reduction means operational.
      (amended 2009/05/11)

M525.2 Showing Compliance
(amended 2009/05/11)

  1. (a) The applicant must provide data from analysis, ground testing and flight testing, or any combination of these, that:
    (amended 2009/05/11)

    1. (1) Validate the parameters used in the analysis required by M525.1 of this appendix;
      (amended 2009/05/11)

    2. (2) Substantiate that the FRM is effective at limiting flammability exposure in all compartments of each tank for which the FRM is used to show compliance with M525.1 of this appendix; and
      (amended 2009/05/11)

    3. (3) Describe the circumstances under which the FRM would not be operated during each phase of flight.
      (amended 2009/05/11)

  2. (b) The applicant must validate that the FRM meets the requirements of M525.1 of this appendix with any aeroplane or engine configuration affecting the performance of the FRM for which approval is sought.
    (amended 2009/05/11)

M525.3 Reliability Indications and Maintenance Access
(amended 2009/05/11)
  1. (a) Reliability indications must be provided to identify failures of the FRM that would otherwise be latent and whose identification is necessary to ensure the fuel tank with an FRM meets the fleet average flammability exposure requirements listed in M525.1 of this appendix, including when the FRM is inoperative.
    (amended 2009/05/11)

  2. (b) Sufficient accessibility to FRM reliability indications must be provided for maintenance personnel or the flight crew.
    (amended 2009/05/11)

  3. (c) The access doors and panels to the fuel tanks with FRMs (including any tanks that communicate with a tank via a vent system), and to any other confined spaces or enclosed areas that could contain hazardous atmosphere under normal conditions or failure conditions, must be permanently stencilled, marked, or placarded to warn maintenance personnel of the possible presence of a potentially hazardous atmosphere.
    (amended 2009/05/11)

M525.4 Airworthiness Limitations and Procedures
(amended 2009/05/11)
  1. (a) If FRM is used to comply with M525.1 of this appendix, Airworthiness Limitations must be identified for all maintenance or inspection tasks required to identify failures of components within the FRM that are needed to meetM525.1 of this appendix.
    (amended 2009/05/11)

  2. (b) Maintenance procedures must be developed to identify any hazards to be considered during maintenance of the FRM. These procedures must be included in the instructions for continued airworthiness(ICA).
    (amended 2009/05/11)

M525.5 Reliability Reporting
(amended 2009/05/11)

The effects of aeroplane component failures on FRM reliability must be assessed on an on-going basis. The applicant/holder must do the following:
(amended 2009/05/11)

  1. (a) Demonstrate effective means to ensure collection of FRM reliability data. The means must provide data affecting FRM reliability, such as component failures.
    (amended 2009/05/11)

  2. (b) Unless alternative reporting procedures are approved by the Minister, provide a report to Transport Canada every sixmonths for the first fiveyears after service introduction. After that period, continued reporting every sixmonths may be replaced with other reliability tracking methods found acceptable to the Minister or eliminated if it is established that the reliability of the FRM meets, and will continue to meet, the exposure requirements of M525.1 of this appendix.
    (amended 2009/05/11)

  3. (c) Develop service instructions or revise the applicable aeroplane manual, according to a schedule approved by the Minister, to correct any failures of the FRM that occur in service that could increase any fuel tank’s Fleet Average Flammability Exposure to more than that required by M525.1 of this appendix.
    (amended 2009/05/11)

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