Remove Clearance Remove Indicated Airspeed Remove Threshold
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Going Below Minimums

AV Web

If the airport is your home drome, and there is a big oak tree or a Walmart on final you can measure the distance from there to the threshold on a sunny day. Then as you fly over your designated landmark and see the threshold, you will know that you have the measured distance. Approach lighting systems are a known, published length.

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Trial by Ice

Air Facts

This particular 172 normally cruised at 120 mph indicated airspeed, but with the ice it would barely do 90 mph and that required full throttle! I filed my IFR flight plan, received a clearance and took off into the gray winter sky. We finally broke out on top into dazzling sunlight carrying about one inch of rime ice.

VOR
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The Flying Bear Goes to Beantown | Part 4, Going Missed

Photographic Logbook

But I accepted the clearance knowing that I could change it with a local Approach control like Syracuse. Caught in series of up and down drafts, the autopilot pitched the Warrior aggressively to maintain altitude and the indicated airspeed trended too high in each updraft. I logged about 0.7 hours of IMC time on the flight.