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Two Easy Rules of Thumb For Calculating a Three Degree Glide Slope

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Source: Two Easy Rules-of-Thumb For Calculating a Three-Degree Glide Slope | Boldmethod (Thanks to boldmethod for sharing and keeping us safe)

Two Easy Rules-of-Thumb For Calculating a Three-Degree Glide Slope

 Have you ever found yourself chasing the glideslope on an ILS approach? There’s an easier way to do it.Groundspeed has a significant effect on descent rate, and there’s a formula you can use to ballpark your feet per minute (FPM) descent, even before you get on glideslope.

One of the most important parts of instrument flying is getting ahead of the airplane. The following formulas are a great way to do just that. In many glass cockpit aircraft, wind vectors and ground track diamonds mean you’ll have a easily visible references to use. GPS groundspeed will make the following equations extremely easy to use…

primary1Boldmethod
Option 1: Multiply Your Groundspeed By 5

If you’re flying your aircraft on a roughly 3 degree glideslope, try multiplying your groundspeed by 5 to estimate your descent rate. The result will be a FPM value for descent that you should target. As you capture the glideslope, make adjustments as necessary.

gs x 5
Option 2: Divide Ground speed In Half, Add “0”

Divide your ground speed in half, add a zero to the end, and you’ll have an approximate FPM of descent. This is another easy way to target an initial descent rate for a 3-degree precision approach, or even a VFR descent into an airport.

divide in half

Both formulas leave you with the same result. Choosing which formula to use comes down to which mental math you’re more comfortable with.

How Wind Affects Descent Rate

A tailwind on final will result in a higher groundspeed, thus requiring a higher descent rate to maintain glideslope. The opposite is true for headwinds. Let’s take a look at a few examples:

Example 1: Headwind of 25 Knots, Final Approach Speed of 100 Knots Indicated Airspeed.

example1

Example 2: Tailwind of 25 Knots, Final Approach Speed of 100 Knots.

example 2
Useful For More Than Just ILS Approaches

Looking for a good way to plan out your 3 degree glideslope? These formulas are great references for LPV approaches, LNAV+V, or even long VFR straight in approaches.

primarygc232

Have you used these formulas before? Tell us how you use them in the comments below.

Chasing Sunsets

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Sit back and enjoy a few sunsets from around the world 🙂 Hope everyone is having a great week!

Thanks to “traveldlife” for sharing

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Cessna 152 Multiple Spins Recovery (Full HD) – YouTube

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This is a spectacular video of a Cessna 152 recovering from a spin.

Thanks to Cheesecake Nijia and Boldmethod for sharing…

Coming To An Airport Near You: The Cirrus Vision Jet | Boldmethod

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The world’s first personal jet just received FAA certification. And with deliveries starting this year, it’s coming to an airport near you. How’s that for an early Christmas present?

Want to learn more about the Vision Jet? Check it out here.

The world’s first personal jet just received FAA certification.

Source: Coming To An Airport Near You: The Cirrus Vision Jet | Boldmethod

7 Types Of Turbulence That Can Rock Your Flight | Boldmethod

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primary2

Flying through turbulence can be stressful and fatiguing, so it’s good to understand where and how it happens.

Here are the 7 most common types of turbulence:

1) Clear Air Turbulence

CAT normally occurs outside of clouds at altitudes above 15,000 feet MSL, and its caused by strong wind shears in the jet stream.

Source: 7 Types Of Turbulence That Can Rock Your Flight | Boldmethod

An Opportunity to Give Back & Support Our Local Communities | Madox Air Sports The Gambia

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We think it is important that people choose where to donate based on how they wish to help others the most. So, if you wish to help out, why not consider visiting The Gambia and take a flight to a …

Source: An Opportunity to Give Back & Support Our Local Communities | Madox Air Sports The Gambia

Avoiding Spatial Disorientation On Your Next Instrument Flight | Boldmethod

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Flying through the clouds on an IFR flight can be one of the most exhilarating things you can do. There’s nothing quite like busting in and out of ‘the soup’. Even better, there’s no feeling quite like seeing the runway appear at the end of an instrument approach. But flying through the clouds is not without risk: between 5-10% of all general aviation accidents result from spatial disorientation, and of those accidents, 90% of them are fatal.

Why Disorientation Happens In The Clouds?
Your eyes are your primary sensory input when you’re flying. You look outside, you see which way the sky is pointing, and you adjust your airplane. But all of that falls apart when you’re in the clouds…

Source: Avoiding Spatial Disorientation On Your Next Instrument Flight | Boldmethod

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