Definition
A bench test of an aircraft engine in which the engine is mounted on a rigid test stand (a 'block') and run under controlled conditions to verify its power output, fuel and oil consumption, operating temperatures, and overall mechanical condition before it is installed in an aircraft.
Plain English
Running a newly built or overhauled engine on a fixed stand in a workshop to make sure it performs correctly before it goes into an aircraft.
Context Anchor
Seen in aircraft maintenance and engine run procedures, especially after engine work or when confirming that an installed engine runs properly.
Derivation
The 'block' refers to the heavy test stand or mounting block the engine is bolted to during the test. Running an engine while it is firmly anchored — rather than installed in an airframe — lets technicians load it, measure it, and observe it safely.
Why Pilots Care
Confirms the engine meets specifications and is safe for flight after maintenance.
Intuition Check
Do not read “block” as meaning a section of a written test. Here, it refers to physically holding the aircraft in place while the engine is tested.
Example Sentence 1
After the overhaul was complete, the engine was mounted in the shop and given a full block test before being released for installation.
Example Sentence 2
The block test showed normal oil pressure and temperature readings across all power settings.