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The Hidden Departure

Gemini Sparkle

Key Takeaways:

  • Safe instrument departures, especially from airports with challenging terrain or weather, are crucial for obstacle avoidance, as highlighted by fatal accidents resulting from non-adherence to procedures.
  • Two main types of departure procedures exist: Standard Instrument Departures (SIDs), designed for both obstacle avoidance and ATC convenience, and Obstacle Departure Procedures (ODPs), solely for terrain clearance and often presented textually, both requiring strict adherence to published climb gradients and routes.
  • Beyond procedures, safe departures necessitate careful consideration of aircraft performance (e.g., density altitude, engine failure scenarios), altimeter errors in cold temperatures (indicated by the "snowflake" symbol), and adherence to airspace restrictions like Class B speed limits.
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It was snowing hard in Elko, Nevada, and getting dark, too. The temperature was about freezing, of course. The FBO put the airplane into a hangar, where the snow melted quickly, and some time with squeegees and towels and a large movable stair got the moisture off the airplane. Our policy is that a clean airplane is the best method of ground deicing, followed by “get into the air right away.” (If there is any doubt, we get deicing.)

Elko is surrounded by mountains. One of the airport’s features is a funky LDA/DME approach to Runway 24 that means flying between two peaks. There’s an RNAV approach but it has higher minimums, so the LDA gets used. We had no trouble getting in, spotting the plowed runway among the snowy hills a few miles out. But now…. Dark? Wet? Mountains? How can we depart safely?

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