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5. PROCUREMENT OF PARTS
 
5.1   Parts stockists and distributors 
 
It is recognized that parts stockists and distributors have a significant influence over preventing the use of unapproved parts. Such organizations have an established commercial role of stocking or obtaining parts, often at short notice. The BCAA does not approve stockists and distributors. 
 
In airworthiness terms, the parts supplier’s role is simply that of a holder of a part and its supporting data for a limited period, the part and data being passed in their entirety to the purchaser. The most effective control is exercised by the purchaser of the parts by ensuring that the part is correct and that the documentation truly reflects the status of the part. Further assurance is provided by the installer purchasing only from those suppliers having a known satisfactory record. 
 
Parts distributors may also break down large orders of identical parts into smaller lots for shipment to end users. In this case they should provide documentation that the parts came from the original large order and either issue a second set of airworthiness documentation or attach a copy of the original airworthiness documentation. 
 
5.2   Parts removed from an aircraft no longer in service 
 
Aircraft withdrawn from service are often used as a source of spare parts, a process sometimes described as “parting out”. These parts, although serviceable at the time the aircraft was placed in storage, may have been affected adversely by storage conditions, including especially environmental factors, or by the length of storage. 
 
The records for the aircraft and its parts prior to the aircraft being placed into storage will need to be researched in order to ascertain the previous maintenance history, and airworthiness directive, modification and repair status of the parts being removed. Any unusual events immediately prior to storage, e.g. heavy landings or lightning strikes, will also have to be considered when deciding on the serviceability of the parts being removed. 
 
It is important that the part removal process be planned and controlled in a manner as close as possible to that adopted for routine maintenance tasks on in-service aircraft. The following points in particular should be considered: 
 
(a)  the means by which the part is removed should be in accordance with the normal maintenance data (e.g. maintenance manuals), using the tooling specified; 
 
(b)  adequate access equipment should be provided; 
 
(c)  if conducted in the open, disassembly should cease during inclement weather; 
 
(d)  all work should be carried out by appropriately qualified maintenance personnel; 
 
　
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