Guest Airplay Posted January 21, 2004 Report Share Posted January 21, 2004 I attended an avionics workshop recently hosted by Transport Canada in co-operation with the Aircraft Electronics Association (AEA). The workshop was open to industry delegates and avionics maintenance people including line and shop specialists. During the discussions, a great deal of time was spent talking about “specified data” and the appropriate use of it. After listening to several statements, I was convinced that the understanding of the definition of “specified data” was quite varied. We all know that major repairs and modifications must be performed in accordance with “approved” or “specified” data but do we all understand what constitutes “specified” data? Many attendees of the workshop regarded avionics installation manuals as “specified” data. Others regarded avionics manufacturer’s service bulletins as specified data. For example, some felt that if Rockwell Collins issued a service bulletin that changes a VHF COM to operate with 8.33 KHz spacing, it is appropriate to replace the existing 25 KHz COM with the new upgraded one modified by service bulletin. I agree that for the purposes of modifying the COM (an aeronautical product) the avionics’ manufacturer’s service bulletin is considered “specified” data, but not for installation on the aircraft. The airworthiness manual defines specified data as: “specified data” - is information contained in authoritative documents which, although not approved by the Minister, has been specified by the Minister as appropriate for the purpose of major modifications and major repairs, in conformity with section 571.06 of the CARs. The following are examples of specified data: (amended 2000/12/01; previous version) (a) drawings or methods described or referenced in Airworthiness Directives; ( data issued by the manufacturer or type certificate holder of the aircraft, component or appliance, such as modification orders, service bulletins, or engineering orders, which include a statement of approval by the applicable regulatory authority or a delegated representative of such an authority. Where the data issued by the aircraft manufacturer are incompatible with those of the component or appliance manufacturer, the data of the aircraft manufacturer shall prevail; © manufacturer’s Structural Repair Manuals; (d) FAA Advisory Circulars AC 43.13-1 and AC 43.13-2, subject to the following conditions: (i) the aircraft is a small aircraft, and the alteration does not affect dynamic components, rotor blades, structure that is subject to pressurization loads, or the primary structure of a rotorcraft; (ii) the alteration does not affect an existing limitation (including the information contained on mandatory placards) or change any data contained in the approved sections of the Aircraft Flight Manual, or equivalent; (iii) the data are appropriate to the product being altered, and are directly applicable to the alteration being made; and, (iv) the data are not contrary to the aircraft manufacturer’s data. Personally, I feel the acid test for determining if something is possibly “specified” data is if it somehow indicates that the certification basis of the aircraft has been considered. So, I don’t think avionics installation manuals or avionics manufacturers service bulletins meet the requirements of the definition of “specified” data for modification of aircraft. What do others consider adequate “approved” or “specified” data? Quote Link to comment Share on other sites More sharing options...
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