Definition
A handheld pneumatic reciprocating saw used in aircraft sheet metal work to cut openings, slots, or curved shapes in thin metal skin and structure where a straight cut from a saw or shear is impractical.
Plain English
A small air-powered saw with a short blade that moves rapidly back and forth, used by aircraft mechanics to cut shapes into sheet metal.
Context Anchor
Seen in aircraft maintenance and sheet-metal repair when cutting panels, skin sections, or repair patches.
Derivation
Named after the Kett Tool Company, which originally manufactured this style of pneumatic saw. Over time the brand name became a generic term for this kind of saw, much like 'Hoover' or 'Kleenex.'
Why Pilots Care
Enables mechanics to remove damaged sections cleanly without excessive vibration that could worsen cracks or delamination.
Intuition Check
Do not think of it as a general hand saw for wood. In this context, a Ketts Saw is a powered tool made for controlled cutting of aircraft sheet metal.
Example Sentence 1
The mechanic used a Ketts saw to cut an inspection opening in the aluminum skin.
Example Sentence 2
After marking the repair outline, she made the initial cut with the Ketts saw to prepare for the patch.