Definition
A single charted fix on an instrument approach procedure that serves two functions at once: it is both an Initial Approach Fix (IAF), where the initial approach segment may begin, and an Intermediate Fix (IF), where the intermediate approach segment begins. Pilots arriving via a feeder route or transition use it as the IAF; pilots being vectored or arriving on a course aligned within the published criteria use it as the IF, bypassing the initial segment entirely.
Plain English
One fix on the approach chart that does two jobs. If you are coming from far out and need to fly the full approach, you treat it as the starting point. If you are already lined up close to final, you treat it as the point where the middle part of the approach begins.
Context Anchor
Seen on instrument approach charts, especially in the initial approach segment, next to a named point labeled “IF/IAF.”
Why Pilots Care
Reduces the number of required fixes, simplifies procedure design, and shortens the overall approach path while maintaining proper segment spacing.
Intuition Check
Do not read IF/IAF as two separate points. It is one charted point with two possible roles, and its role depends on how you enter the procedure.
Example Sentence 1
ATC cleared us direct to CENLU and 'straight in,' so we used it as the IF and went directly into the intermediate segment without flying the hold.
Example Sentence 2
Because the procedure used a dual-purpose IF/IAF, we did not need a separate initial approach fix before reaching the intermediate segment.