Definition
A named point on an instrument approach procedure that marks the beginning of the intermediate segment, which lies between the initial approach segment and the final approach segment. At the IF, the aircraft is established inbound, aligned with or close to the final approach course, and is configured for descent toward the final approach fix.
Plain English
A specific point on the approach chart where the airplane has finished the early turning-and-positioning part of the approach and is now lined up and getting ready for the final descent to the runway.
Context Anchor
Seen on the plan view of an instrument approach chart, often near the course that leads toward the final approach path.
Derivation
Intermediate comes from the Latin intermedius, meaning 'in the middle.' The name fits exactly — this fix sits in the middle of the approach, between the initial setup and the final descent.
Why Pilots Care
Crossing the IF signals the pilot to configure the aircraft, complete checklists, and establish the proper descent rate for a stabilized approach.
Intuition Check
Do not read fix as “repair.” In this context, a fix is a known position. Intermediate does not mean unimportant; it means the position is between the early part of the approach and the final part.
Example Sentence 1
Crossing the IF, the pilot reduced speed and completed the approach checklist before continuing to the final approach fix.
Example Sentence 2
At the IF the pilot verified alignment with the final approach course before continuing the approach.