These crossing points on the arc are more helpful suggestions than hard rules. How you take the hint depends on both the approach in question and your relative velocity.
Lead Radial tip-offs
Despite the quips about aviator egos barely fitting inside the cockpits that carry them, pilots have a high tolerance for following directions.
Key Takeaways:
- DME arcs, though less common today due to GPS, are navigational procedures that require pilots to precisely anticipate turns onto an inbound course.
- Lead radials (LRs) are charted reference points, typically two miles from the inbound course, designed to help pilots anticipate turns from a DME arc, especially when the intercept angle is not 90 degrees.
- Pilots should understand that lead radials are suggestions, not strict turn initiation points, and do not necessarily mean the aircraft is established on the inbound course; factors like groundspeed and localizer indication still require pilot judgment.
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