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G. Service Difficulty Reports (SDR): The FAA’s database of SDRs contains reported maintenance and/or service problems for any aircraft, engine, or component. An airplane owner can search this database for model specific or individual airplane reports. This can be helpful for identifying areas that may be candidates for special attention (especially if the logbooks are incomplete). This can be useful for determining any past difficulties for specific airplanes. SDRs are available from the FAA Aviation Systems Data Branch (AFS-620), Box 25082, Oklahoma City, OK 73169. You can access the SDR database at the following FAA website: http://afs600.faa.gov or by clicking the following hotlink: SDR Info.
In order to make the database as useful as possible, owners or mechanics are encouraged to submit SDRs with complete confidence that they will not lead to enforcement actions. Submitting an SDR can help alert other owners, mechanics, or inspectors of problems that may arise in aircraft no longer supported by an active manufacturer. 
H. National Transportation Safety Board (NTSB) Records: The NTSB keeps descriptions of more than 140,000 aviation accidents in a searchable database. Searching this database helps the owners/operators or mechanics determine whether their particular aircraft has ever been involved in an accident. This could help the owner/operator or mechanic match up repairs on an aircraft to the reasons for those repairs. It can also help determine trends of accidents regarding a particular model of aircraft. You can access the NTSB database at the following website: www.ntsb.gov/aviation/aviation.htm or by clicking the following hotlink: Accident Database & Synopses.
I.  General Aviation Airworthiness Alerts: Also known as AC 43-16A, aviation maintenance alerts are compilations of recent maintenance problems that are showing up on aircraft (including factory- and amateur-built aircraft, helicopters, powerplants, and propellers), but have not been fully evaluated to the point of becoming a service bulletin, AD, or SAIB. The FAA publishes these alerts monthly from SDRs submitted by those who operate and maintain the civilian aircraft fleet. For aging aircraft, they can be an early indication of a developing trend of problems. You can access the General Aviation Airworthiness Alerts database at the following FAA website: http://av-info.faa.gov/ or by clicking the following hotlink: General Aviation Airworthiness Alerts.
J.  Supplemental Type Certificates (STC): STCs have been developed for many  different types of aircraft. These are incorporated to upgrade or improve avionics,  systems, engines, gross weight, etc. Design upgrades often have a positive effect  with regard to aging issues. A review of the FAA STC database for a specific make  and model may reveal design improvements to address an aging issue discovered  during routine inspection and maintenance. You can access the STC database at the following FAA website: http://www.airweb.faa.gov/rgl or by clicking the following hotlink: Supplemental Type Certificates (STC).
　
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