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B. Aircraft Records: The FAA provides records for specific aircraft, propellers, and engines. By sending a request to the FAA with the aircraft N number, an owner can receive a copy of all the records on that particular aircraft. Because airplane N numbers can change, you should also make a similar request for aircraft make, model, and serial number. If these two do not match, then you may need to further investigate as to why.
Records available include registrations, bills-of-sale, repair and alteration form 337s, supplemental type certificates (STC), and other information. You should also compare this paperwork to the physical airplane to determine if any unrecorded modifications have been made. 
These records are sent either on microfiche, on CD, or on paper for some older aircraft. There is a nominal charge to open the aircraft file and copy the material. Information regarding records requests is available from the FAA at Flight Standards Service (AFS-750), Box 25504, Oklahoma City, OK 73125 or at the following website: http://diy.dot.gov.
C. Type Certificate Data Sheets (TCDS): The TCDS contains relevant data specific to a model type. The FAA awards a type certificate (TC) only after the applicant shows compliance with the safety regulations as specified by the certification basis listed on the TCDS. The TCDS is a summary of the baseline technical description of the model type, which includes information such as performance, weights, center of gravity limits, and engine and propeller specifications. You can access the TCDS database at the following FAA website: http://www.airweb.faa.gov/rgl or by clicking the following hotlink: type certificate data sheet.
D. Airworthiness Directives (AD): The FAA issues ADs to owners of affected airplane model types, engines, propellers, or appliances such as instruments. An AD is a mandatory action to correct an unsafe condition. The required actions are usually modifications, one-time inspections, repetitive inspections, or a combination. Owners should compare ADs for their airplane model type with their logbook entries to ensure that the ADs have been done. You can access the AD database at the following FAA website: http://www.faa.gov/ or by clicking the following hotlink: Airworthiness Directives.
E. Special Airworthiness Information Bulletins (SAIB): The FAA issues SAIBs to owners of affected airplane model types, engines, propellers, or appliances such as instruments. An SAIB is not mandatory but provides information regarding an airworthiness concern that is less serious than an unsafe condition addressed with an AD. SAIBs often reference manufacturer service bulletins and service letters. You can access the SAIB database at the following FAA website: http://av-info.faa.gov/ or by clicking the following hotlink: Special Airworthiness Information Bulletins (SAIB).
F. Service Bulletins/Letters: Aircraft manufacturers issue service bulletins and service letters to address in-service issues or as a method of product improvement. These are often instructions for accomplishing the mandatory actions of an AD. You can obtain service bulletins and service letters from the manufacturer and often from a model’s type club.
　
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