replacement

"replacement" includes, in relation to any part of an aircraft or its equipment, the removal and replacement of that part, whether or not by replacing it with the same part, and whether or not any work is done on it, but does not include the removal and replacement of a part which is designed to be removable solely for the purpose of enabling another part to be inspected, repaired, removed or replaced, or otherwise enabling any cargo to be loaded;
PU(A) 139/1996 - CIVIL AVIATION REGULATIONS 1996
2. Interpretation.

replacement

"replacement" means a work operation which involves the removal and replacement of the same part or the substitution of an approved alternative part;
PU(A) 139/1996 - CIVIL AVIATION REGULATIONS 1996
25. Interpretation.