VDP Limitations

Say youre flying to Asheville, North Carolina on a rainy IMC day. The visibility is hovering around a mile and a half and the ceiling is 1200 feet. ATC has you on vectors for the RNAV (GPS) RWY 34. Without a WAAS GPS in your Turbo Bugsmasher, youre stuck with the LNAV minimums. The weather is above the Category B minimums that youll be using, so you shouldnt have any problems. Right?

Key Takeaways:

• Even when non-precision approach ceiling and visibility minimums are met, low reported visibility (less than the VDP distance) can prevent pilots from establishing visual reference at the Visual Descent Point (VDP) and making a normal, safe descent to the runway.
• This problem occurs because non-precision visibility minimums and VDP locations are determined independently, often leading to situations where legal minimums don't guarantee a practical visual approach.
• The VDP is critical for initiating a safe, stabilized descent; if the runway is not in sight by the VDP, pilots should be prepared to execute a circling maneuver or a missed approach.
• If a VDP is not published, pilots can estimate one (e.g., HAT / 300) but must exercise heightened caution, as its absence often indicates obstacle penetrations below the Minimum Descent Altitude (MDA).

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