Altimeter Clearance Pitot Tube 
Air Facts
MAY 5, 2025
I filed my IFR flight plan, received a clearance and took off into the gray winter sky. We entered the holding pattern over Jeff City, flew two circuits and finally received our approach clearance. Passing through 2,800, the altimeter almost stopped, but finally, at 2,900 we punched through the inversion layer!
Northstar VFR
OCTOBER 27, 2024
Under VFR, the MEF guarantees 100’ obstacle/terrain clearance within that quadrant. Above 18,000’ MSL all aircraft set their altimeters to the standard pressure of 29.92. You encounter icing, and your pitot tube completely ices over, but your static port remains open. Technically, it’s FL600.
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