Definition
A handheld drilling tool, either manually operated or powered, used by aircraft mechanics to cut holes in metal, composite, or other aircraft materials. In aviation maintenance, hand drills include manually operated types (such as the geared eggbeater drill) and powered types (pneumatic or electric) that are held and guided by hand rather than mounted on a stand.
Plain English
A drill you hold in your hand to make holes, rather than one fixed to a bench or stand.
Context Anchor
Seen in aircraft maintenance and repair tasks, especially when holes must be drilled in a part while working at the aircraft or on a workbench.
Derivation
“Hand” points to the way the tool is held and controlled. “Drill” comes from older words meaning to bore or make a hole. Together, the term emphasizes a hole-making tool guided by the mechanic rather than a fixed shop machine.
Why Pilots Care
Hand drills are a core tool in airframe repair work. Holes drilled for rivets and fasteners must be clean, straight, and the correct diameter — poor drilling can weaken a structure or cause cracks to form around fastener holes.
Intuition Check
Do not assume “hand drill” always means a drill powered only by muscle. In maintenance use, it can also mean a hand-held electric or air-powered drill.
Example Sentence 1
The mechanic used a pneumatic hand drill to open up the rivet holes in the wing skin.
Example Sentence 2
A hand drill gave better control when working near fuel lines where sparks were a concern.