Definition
An air traffic control procedure that permits aircraft to take off or land at the same time on two runways that cross each other when those runway surfaces are wet. The procedure relies on published landing distance data, runway condition reporting, and assigned hold-short points so that no aircraft is expected to roll past the intersection while another aircraft is using it.
Plain English
It is a controller procedure for handling two aircraft at once on runways that physically cross, when the runways are wet rather than dry. Each aircraft is given instructions that keep it clear of the crossing point at the right moment, so the two operations can happen together safely.
Context Anchor
Seen in FAA acronym lists, airport operations discussions, and tower procedures for airports with runways that intersect.
Why Pilots Care
Awareness prevents runway incursions and ensures proper spacing when braking distances are longer on wet pavement.
Grounding Statement
The key idea is controlled use of crossing runways when wet pavement makes stopping performance more critical.
Intuition Check
Do not read “simultaneous” as meaning two aircraft may be at the runway intersection at the same time. It means the operations are managed close together under approved control rules.
Example Sentence 1
Tower advised that SOIWR procedures were in effect, so we were given a hold-short instruction at the intersection on landing.
Example Sentence 2
During SOIWR on wet runways, pilots increased their spacing to account for reduced traction.