No-Fly Zones

You are flying a well-appointed, 180-hp Cessna 172 and with a friend have just taken off from Aspen, Colo., on a trip back to Wichita. You make a right climbing turn over the hills north of the airport and, at 80 knots, continue climbing to the southeast. The air has a gentle texture, not even light turbulence.

As you gain altitude in the valley of the Roaring Fork River you are below the tops of the mountains. The September gold of the aspens is phenomenal. Theres a cloudless, blue sky. You are feeling good because you flew in and out of Aspen successfully and didnt foul up in the busy mix of aircraft types and opposite direction traffic on runway 15-33.

Your airplane rises steadil...

Key Takeaways:

• Mountain flying, particularly when climbing on the windward side of passes, presents a significant risk of unexpected and powerful microscale downdrafts that can lead to rapid stalls and crashes, even for experienced pilots in clear weather.
• A crucial preflight warning sign for hazardous windward-side downdrafts (e.g., east of Aspen towards the Continental Divide) is a significantly higher surface barometric pressure at Leadville compared to Aspen; pilots should reroute if this difference is substantial.
• Safe operations in mountainous terrain demand a heightened awareness of subtle microscale weather phenomena, meticulous preflight planning including surface pressure comparisons, and proficiency in turbulence control techniques like flying at maneuvering speed and using gentle, coordinated rudder inputs.

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