Definition
A portable collection of tools, parts, and supplies assembled for performing aircraft maintenance, repairs, or inspections away from the home shop or hangar.
Plain English
A travel kit of tools and parts that a mechanic takes out to where the aircraft is, so they can do the work without going back to the shop.
Context Anchor
Seen in maintenance manuals, service bulletins, parts catalogs, and work orders for aircraft maintenance or modifications.
Derivation
"Field" here means out in the working area rather than at a fixed base, the same sense used in "field service" or "field repair." A field kit is simply the kit you carry into the field.
Why Pilots Care
If a mechanic arrives to fix your aircraft at a remote strip, the contents of their field kit determine what can be repaired on-site and what will require a tow, ferry permit, or parts shipment.
Intuition Check
“Field” does not mean a farm or just the runway area here. It means the aircraft’s operating or maintenance location, away from the factory or main shop.
Example Sentence 1
The mechanic brought a field kit to the remote strip to replace the failed magneto.
Example Sentence 2
Before departing on a cross-country ferry flight, the pilot inventoried the field kit for common spare fuses and fasteners.