Definition
A paved runway, taxiway, or ramp surface made of asphalt — a black, petroleum-based binder mixed with aggregate (stone and sand) to form a durable, flexible pavement. On airport diagrams, charts, and NOTAMs, ASPH indicates that the surface in question is asphalt rather than concrete, turf, gravel, or another material.
Plain English
ASPH means the surface is made of asphalt — the same black paving material used on most roads.
Context Anchor
Seen in airport information, runway surface descriptions, and airport notices that use shortened surface-type codes.
Derivation
From the Greek 'asphaltos,' meaning a secure, firm substance — originally referring to natural bitumen used as a binder in ancient construction. The link is helpful because it reflects what asphalt still does today: it binds aggregate into a firm, sealed surface.
Why Pilots Care
Surface type affects braking action, hydroplaning risk, tire wear, and required takeoff or landing distances.
Intuition Check
ASPH does not tell you the runway is in good condition. It only tells you the surface material is asphalt.
Example Sentence 1
The Chart Supplement listed Runway 14/32 as ASPH, 4,200 feet long.
Example Sentence 2
After rain, pilots checked the ASPH runway condition before landing to assess braking.