4.4.4 Service difficulty reporting system
4.4.4.1 General
4.4.4.1.1 The Service Difficulty Reporting System (SDR) is established to support the CAA in its mandate to foster an acceptable level of safety by: a) promoting product safety improvement; b) detecting trends (as opposed to isolated cases); and
c) giving the CAA the necessary tools to discharge the State of Registry’s obligations with regard to continuing airworthiness information, as set forth in Annex 8, Part II, 4.2.3 f).
4.4.4.1.2 The current aircraft population is too large to achieve full knowledge of all potential safety problems solely through inspection. Furthermore, in most States the aircraft population is increasing more rapidly than the AID staff. The SDR assists in effective decision making, manpower utilization and enhancement of safety. A properly implemented SDR provides the intelligence needed to assess defects, institute early corrective action and thus assist in accident prevention.
4.4.4.1.3 The SDR is a feedback system which provides a most effective resource for decision-making on matters of reliability and airworthiness. The level of sophistication of the SDR can range from the use of advanced computers with immediate readout capabilities, to manual programmes which utilize a reporting form that is completed by the operator and manually processed by the regulatory agencies. Future development of the SDR could result in a world-wide sharing of service difficulty information such as is being done now with the ICAO coordinated accident/incident reporting programme.
4.4.4.2 Sources of information for the service difficulty report
Service difficulty reports should be received from sources such as commercial aviation operators, and from any source having access to aviation safety information, such as air traffic control. Significant malfunctions, failures, or conditions brought to the attention of or noted by the AID inspector during surveillance of aviation industry activities should also be reported.
4.4.4.3 Guidelines for reporting
4.4.4.3.1 CAA regulations should require commercial operators to submit specified information to the AID. The reports should be submitted on a common form. The regulations should require a report for each malfunction, failure, or defect that occurs under the reportable categories. Similar failures that continue to occur should be reported so the manufacturer and the State of Manufacture are aware of trends that are developing. One-time reporting of similar defects is unacceptable. In addition, each operator should report any other failure, malfunction, or defect in an aircraft that occurs or is detected at any time, if in the holder's opinion that failure, malfunction or defect has endangered or may endanger the safe operation of an aircraft.
Note.— A number of examples of forms and methods used for handling service difficulty reports by Contracting States may be found in ICAO Circular 95 — The Continuing Airworthiness of Aircraft in Service.
4.4.4.3.2 Each operator should report the occurrence or detection of each failure, malfunction or defect concerning at least the following:
a) fires during flight and whether or not a fire warning system was installed and functioned properly;
b) false fire warning during flight;
c) an engine exhaust system that causes damage during flight to the engine, adjacent structure, equipment, or components;
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