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5 Rules-Of-Thumb You Can Use On Your Next Flight

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Flying gets a lot easier once you know some basic rules-of-thumb. Here are 5 of the best rules, and how to use them.

1) Calculating Glideslope Descent Rates

If you're flying a 90-knot approach speed on a 3-degree glideslope, you'll need to descend at roughly 450FPM to maintain the glideslope. But how did we come up with that?

There's a pretty easy rule-of-thumb to figure that descent rate out. Divide your ground speed by 2, then add a 0 to the end. So if you take 90 knots / 2, you get 45. Add a zero to the end, and you get 450 FPM. There's another way to approximate this. You can also multiply your groundspeed by 5 and you'll get an approximate descent rate for a 3-degree glideslope.

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2) More Descent Calculations

At a 1 degree angle of descent, for every 1 mile you fly, you'll descend 100 feet. This ratio can be used to determine other aspects of descent. For instance, if you have 1 mile to descend 600 feet, you'll need a 6-degree descent.

While you may be able to chop and drop in a C172, a larger jet or turboprop usually can't do that. Plus, it's not safe. Try your best to plan a 3-degree arrival into all of your airports for the safest and most gentle descent.

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3) Course Corrections

The 1 in 60 rule states that if you're off course by 1NM after 60 miles flown, you have a 1-degree tracking error. Time to correct that heading!

Another tip: If you're 60 miles away from a VOR, and you're off course by one degree, you're off course by one mile. Last thing: if you fly a 60-mile arc around the VOR, you'd fly a total of 360 miles...talk about a long instrument approach!

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4) How To Calculate Windshear

Rule-of-thumb: the total shear is double the peak wind. If the outflow speed of a microburst is 30 knots, you'll experience about 60 knots of shear as you cross the microburst. And it all can happen in a very short period of time.

Think about what would happen to your Cessna 172 if you went from 100 knots to 40 knots in the matter of a few seconds...

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5) Flying Gusty Approaches

In gusty conditions, add half of the gust factor to your approach speed. If your final approach speed is 80 knots, and the winds have a gust factor of 20 knots (for example, winds 10 gusting to 30), fly the approach at 90 knots.

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What other rules of thumb do you use? Tell us in the comments below.


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