Definition
Hardware components, typically in the form of sleeves, washers, or short tubes, used to maintain a specific distance between two parts in an aircraft assembly. Spacers ensure correct alignment, proper preload on bearings, accurate clearance between rotating and stationary components, and consistent torque distribution when fasteners are tightened.
Plain English
Small sleeves, washers, or tubes placed between two parts to hold them the right distance apart so the assembly fits and works correctly.
Context Anchor
Seen in aircraft maintenance, assembly drawings, wheel and brake work, control-system hardware, and places where bolts pass through several parts.
Derivation
Spacer comes from space, meaning an open distance between things. In aircraft use, a spacer is the part that preserves that distance.
Why Pilots Care
Missing, incorrect, or improperly installed spacers can lead to misaligned parts, incorrect bearing preload, or unsafe clearances. During preflight or maintenance review, pilots and mechanics confirm spacers are present and correct because their absence is easy to overlook but can cause significant component failure.
Intuition Check
Do not think of spacers as extra filler or packing material. In aircraft hardware, spacers are installed deliberately to hold a specific distance or alignment.
Example Sentence 1
The mechanic installed a steel spacer between the wheel bearings to set the correct preload before torquing the axle nut.
Example Sentence 2
Before reinstalling the wheel, the mechanic checked the spacers for wear that could affect bearing preload.