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:
- Lead radials on DME arcs serve as charted reference points, typically two miles from the final approach course, to help pilots anticipate turns, especially when the intercept angle is not 90 degrees.
- These lead radials are "helpful suggestions" or reference points rather than strict turn initiation rules; pilots must still consider factors like groundspeed and arc size for optimal turn execution.
- Lead radials are charted when the intercept angle is greater than 90 degrees or mandated by a flight check, and their appearance and implications can vary between chart types.
- Pilots should be aware that crossing a lead radial does not automatically mean being established on the inbound course, and GPS systems may initiate turns at these points which might require manual adjustment for accurate intercepts.
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