Document ID: chunk:federal_register_of_legislation:F2022C01244:body:0:p15
Version: federal_register_of_legislation:F2022C01244
Segment Type: other
Provision Reference: 
Character Range: 38464–41389

following:
(a) pilot reports;
(b) unscheduled removals;
(c) confirmed failures;
(d) sampling inspections;
(e) workshop findings;
(f) functional checks;
(g) bench checks.
Note   All of the above sources may not necessarily be covered in each and every program. The scope and objective of the program, and items controlled by the program, will dictate the nature and source of data.

3.8 Performance standards
      3.8.1 The reliability program must include a performance standard expressed in mathematical terms for each item covered by the program that defines the acceptable level of reliability for the item. The following are some of the commonly used performance standards:
(a) premature removal rates for an item;
(b) confirmed failure rates for an item;
(c) in-flight shutdown rates for engine;
(d) flight delays or cancellation rates due to defect in, or failure of, an item;
(e) internal leakage rates for an item.
      3.8.2 Upper and lower limits may be used to express performance standards. This represents a reliability band or range by which the reliability is interpreted.
      3.8.3 The program must describe the methods and data to be used for establishment of the performance standard.
      3.8.4 The performance standard must be responsive and sensitive to the level of reliability experienced. It must not be so high that even abnormal variations would not cause an alert, or so low that it is constantly exceeded in spite of corrective action measures.
      3.8.5 The performance standards must be based on the operator's own operating experience with the exceptions mentioned in subsection 3.8.6. The period of experience will be dependent on fleet size and utilisation.
      3.8.6 If the operator's operating experience of an aircraft type or model is non-existent or limited, performance standards may be based on 1 or more of the following as applicable:
(a) the experience of other operators of the same or a similar aircraft type or model;
(b) the operator's own experience of a similar aircraft type or model;
(c) the performance of a similar product or system on another aircraft type or model;
(d) the expected in-service reliability values used in the design of the aircraft.
Note   For paragraph (d), the values are normally quoted in terms of mean time between unscheduled removals or mean time between failure, for both individual product and complete systems.
      3.8.7 The program must contain procedures for monitoring and reviewing performance standards at regular intervals to reflect the operating experience, product improvement and changes in procedures.
      3.8.8 The program must provide for the review of the performance standards set in accordance with subsection 3.8.6, after the operator has gained sufficient operating experience.

3.9 Display of information
      3.9.1 The reliability program must provide for a format of display that allows easy identification of