10/6/17 AC 145-9A
5-29
5.10.4 General. Describe the inspection system in detail, from establishing the purchase of
aviation articles and how that material is inspected upon receipt, receiving customer’s
articles, progressing through each inspection step, and ending in final inspection and
approval for return to service. Describe each step in a format easily understood by the
employees. A flowchart may be helpful in developing these procedures. This section
should also describe the system for controlling and documenting the work in process
(work order system).
5.10.5 Service Difficulty Reports (SDR). Section 145.221 requires the repair station to notify the
FAA within 96 hours after discovering any serious failure, malfunction, or defect of an
article. Many repair stations use FAA Form 8010-4, Malfunction or Defect Report, to
comply with this requirement. Information for completion of this form may be found in
AC 20-109, Service Difficulty Program (General Aviation), and may be submitted via the
Web at http://av-info.faa.gov/sdrx/.
Note: An SDR should be submitted when a failure, malfunction, or defect of an
article is identified, other than an in-service condition normally detected during
the maintenance, preventive maintenance, or alteration of that article. A “serious
failure, malfunction, or defect of an article,” as stated in § 145.221, is intended to
identify those articles that exhibit a premature or unusual failure not ordinarily
discovered during the maintenance of that article. As an example, an in-flight
engine failure, while potentially serious for that flight, would not be considered a
serious failure requiring submission of an SDR for the purpose of § 145.211 if the
failure was due to damage incurred during the engine’s normal operating
environment (e.g., wildlife ingestion or foreign object damage (FOD)). However,
if upon disassembly of the engine a failure mode of a subcomponent of that
engine that has not been previously observed in normal service is discovered
(e.g., a cracking turbine blade, compressor blade, turbine, or compressor disk,
discovered in a location not previously identified, or the suspected manufacturing
defect of a part), an SDR should be submitted.
5.10.5.1 Normal wear and defects frequently observed should not be criteria for filing
an SDR (e.g., typical seal, bushing, or coating wear), even if the result was a
failure of the next higher assembly. Certificate holders should have
procedures to identify, investigate, and determine if a failure, malfunction, or
defect is the result of normal in-service use or if it is a previously unknown
failure mode warranting submission of an SDR.
5.10.5.2 The primary purpose of the Service Difficulty Reporting System (SDRS) is to
help identify negative trends so that mitigating actions can be accomplished as
soon as possible.
5.10.5.3 The regulation also states that the repair station may submit
FAA Form 8070-1, Service Difficulty Report—Aeronautical Equipment, for a
certificate holder operating under part 121, 125, or 135. Information on
completing FAA Form 8070-1 is attached to the form. The repair station
should not report the same failure, malfunction, or defect using more than one