Definition
A maintenance action in which an existing aircraft part is removed and a new, overhauled, or otherwise approved part is installed in its place, performed in accordance with the manufacturer's instructions, applicable airworthiness data, and the appropriate regulations governing who may perform and approve the work.
Plain English
Taking an old or worn part off the aircraft and putting an approved new or rebuilt one in its place, following the proper instructions and rules.
Context Anchor
Seen in aircraft maintenance records, inspection write-ups, and maintenance handbook discussions about what work was done to an aircraft.
Why Pilots Care
Ensures the aircraft remains airworthy and prevents failures that could affect safety of flight.
Intuition Check
Do not assume this means any simple swap is automatically allowed. In aviation, replacing a part must use the correct part for the aircraft and must be done and recorded according to the maintenance rules that apply.
Example Sentence 1
The mechanic documented the replacement of parts in the engine logbook after installing a new oil filter and gasket during the 100-hour inspection.
Example Sentence 2
All replacement of parts must be entered in the maintenance logs with the correct part numbers and dates.