Definition
A clear, colorless, flammable liquid alcohol (chemical formula C3H8O) used in aviation maintenance as a solvent and cleaning agent, and as an additive to fuel systems to absorb water and prevent ice formation in fuel lines.
Plain English
A type of alcohol that cleans surfaces, dissolves residues, and can be added to fuel to soak up water so it doesn't freeze in cold conditions.
Context Anchor
Seen in aircraft maintenance procedures for cleaning, surface preparation, inspection, bonding, sealing, or removing small amounts of contamination.
Derivation
From 'isopropyl,' a chemical name describing the arrangement of carbon atoms in the molecule, plus 'alcohol.' The 'iso-' prefix (Greek 'isos,' meaning equal) indicates a branched structure. Knowing this distinguishes it from other alcohols like ethyl (drinking) alcohol or methyl (wood) alcohol, which are not interchangeable in aviation use.
Why Pilots Care
Removes oils, bugs, and residues that could interfere with control surfaces, instruments, or visibility while avoiding corrosion or streaking that might affect safe operation.
Intuition Check
Do not assume “alcohol” means drinking alcohol or that it is safe for every surface. In maintenance, isopropyl alcohol means a specific fast-evaporating cleaning liquid, and approval for the surface still matters.
Example Sentence 1
The technician wiped the static ports clean with isopropyl alcohol before reinstalling the cover.
Example Sentence 2
Isopropyl alcohol was used on the static ports to ensure no moisture or dirt remained after washing the aircraft.