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Cleared For The MSA?

Gemini Sparkle

Key Takeaways:

  • When cleared for an RNAV (GPS) approach, pilots are authorized to descend to the minimum altitude depicted within the Terminal Arrival Area (TAA) sector, which often aligns with the charted Minimum Safe Altitude (MSA).
  • This procedure is specific to RNAV approaches, differing from traditional IFR rules where MSA was primarily for emergency use or required explicit altitude clearances for descent.
  • Regulatory documents such as the FAA's Instrument Procedures Handbook and Air Traffic Control Order 7110.65 confirm that once within the TAA's lateral boundaries and cleared for the approach, descent to the TAA's minimum altitude is expected without further specific altitude restrictions.
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Not long ago, I was conducting a two-day, six-flight, expanded instrument proficiency check (IPC) with the owner of an A36 Bonanza. We were above an undercast at 7000 feet en route from Wichita, Kans., to Emporia Municipal (EMP), a non-towered airport a short 25 minutes to the northeast. Had the skies been clear, we would have flown this VFR and I was going to present a “lost communications” exercise. As it was, we regrouped and flew IFR, the pilot under the hood the entire way. Not being able to pass up a good opportunity for distractions, I simulated failure of his only attitude indicator just after takeoff.

Shortly, I got my own distraction. We received an approach clearance recently that I’d never heard before, one that made me doubt one of the basic precepts of IFR flight. It may be something Aviation Safety readers look at and say, “Duh, everyone knows that.” I suspect, however, that many or most will not have received this clearance before, and may have been as confused about it as I was. 

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