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1.7.4.3 Operator’s approved aircraft maintenance programmes should be subject to periodic review to ensure that they take into account the current Type Certificate holder’s recommendations, revisions to the maintenance review board report, mandatory requirements and maintenance needs of the aircraft.
1.7.4.4 The operator should review the content of the maintenance programme at least annually for continued validity in the light of operating experience.
1.8 Reliability programmes
1.8.1 A reliability programme could be required in the following cases :
a) the aircraft maintenance programme is based upon MSG-3 logic; or
b) the aircraft maintenance programme includes condition monitored components; or
c) the aircraft maintenance programme does not include overhaul time periods for all significant system; or
d) when specified by the Manufacturer’s maintenance planning document or MRB.
Note.— for the purpose of this paragraph 1.8, a “significant system” is a system the failure of which could hazard the aircraft safety.
1.8.2 Intent of a reliability programme
The purpose of a reliability programme is to ensure that the aircraft maintenance programme tasks are effective and their periodicity is adequate. It therefore follows that the actions resulting from the reliability programme may be not only to escalate or delete maintenance tasks, but also to de-escalate or add maintenance tasks, as necessary. A reliability programme provides an appropriate means of monitoring the effectiveness of the maintenance programme.
1.8.3 Details of reliability programmes
1.8.3.1 Reliability programmes are designed to supplement the operator's overall programme for maintaining aircraft in a continuous state of airworthiness. There are a number of maintenance reliability programmes now in operation that use new and improved maintenance management techniques. Although the design and methods of application vary to some degree, the basic goals are the same — to recognize, access and act upon meaningful symptoms of deterioration before malfunction or failure in order to establish and monitor the maintenance control requirements.
1.8.3.2 Performance standards (alert values, etc.) are established by actuarial study of service experience using statistical methods coupled with application of technical judgement. These standards are used to identify trends or patterns of malfunction or failures experienced during programme operation.
Even though reliability programmes vary, they should provide means for measurement, evaluation, and improvement predictions. They should contain the following elements:
a) an organizational structure;
b) a data collection system;
c) a method of data analysis and display;
d) procedures for establishing performance standards or levels;
e) procedures for programme revision;
f) procedures for time control; and
g) a section containing definitions of significant terms used in the programme.
1.8.3.3 It is intended that the specific needs of operators, in terms of operating philosophy, record-keeping practices, etc. be reflected in their reliability programmes. The extent of statistical and data processing required for programme operation is entirely dependent on the character of the particular programme. Programmes may be simple or complex, depending on the size of the operator and other factors. The smaller as well as the larger operators may develop maintenance reliability programmes to meet their own specific needs.
1.8.4 Reliability programme criteria
1.8.4.1 The word “reliable” is a broad term meaning dependable or stable. The term, as used by the aviation industry, applies to the dependability or stability of an aircraft system or part thereof under evaluation. A system or component is considered “reliable” if it follows an expected law of behaviour and is regarded “unreliable” if it departs from this expectation. These expectations differ greatly, depending upon how the equipment is designed and operated.
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适航手册 AIRWORTHINESS MANUAL(123)
