Definition
The end of an aircraft engine opposite the propeller. On a typical reciprocating engine, this is the accessory end, where components such as the magnetos, generator or alternator, fuel pump, vacuum pump, and oil pump are mounted and driven by the accessory gearing.
Plain English
The back end of the engine — the end that is not connected to the propeller. It's where the engine-driven accessories like the magnetos and pumps live.
Context Anchor
Seen in aircraft engine maintenance descriptions when identifying which end of the engine a part, case, cover, or fitting is on.
Derivation
Anti-' here comes from Greek 'anti', meaning 'opposite' or 'against'. So 'anti-propeller end' simply means the end opposite the propeller. The word isn't being used in its more familiar sense of 'against' something — it just means 'the other end'.
Why Pilots Care
Mechanics and pilots reference this end when locating accessories or checking for leaks during inspections and overhauls.
Intuition Check
Do not read “anti-propeller” as a device that works against the propeller. In this term, “anti” simply means the end opposite the propeller.
Example Sentence 1
The mechanic removed the cowling to access the magnetos at the anti-propeller end of the engine.
Example Sentence 2
Inspect the anti-propeller end for oil seepage during the preflight walk-around.