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Cessna Altimeter
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 Aircraft Altimeter -1,000/+35,000ft Experimental Aircraft LSA Cessna Piper  US $91.00
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The density altitude is just one of the many types of altitude that you have to understand when you're trying to learn to fly. This altitude is defined as the height which the aircraft "feels" or thinks it is in, thus it will affect your airplane's performance greatly. For example, in high altitude airfields, you may be at ground level but your aircraft will feel that it is thousands of feet up which is partly true because of the elevation.
Nevertheless, calculating density altitude is very important in aviation. There are several ways that you can do that, but you can easily do so using a chart. This chart will make it so easy for us because it has all the necessary variables and values necessary for the calculation right in it. So, let's go over and start learning how to calculate this altitude using the chart.
Pressure Altitude
The first thing you need to figure out is your pressure altitude. What we need, in turn, is our altimeter setting. These settings are provided for us, fortunately, so it's easy. Now, with our altimeter setting, we look it up in the chart and right beside it we can find our pressure altitude. That's a rough altitude of our pressure altitude, but that's good enough. We add our field elevation and then we get our pressure altitude.
Temperature
Next thing to find out is our temperature. The temperature is located at the bottom of the density chart. In other words, it is the X of the graph while the pressure altitude is the Y. Now, the pressure altitude always corresponds to a temperature. Ambient temperature is always provided for in weather reports as well so that's not a problem as well.
Remember that this temperature is always in degrees Celsius and corresponds to outside temperature. IF you're on the surface, this is the temperature on the surface. When you're in flight, this is the temperature aloft and you'd have to figure out winds aloft as well.
Figuring Out the Density Altitude
With our pressure altitude and our temperature plotted together, we can now arrive at a point where the two meet in the chart. Once you have that point figured out, the only thing we need to is to ride the line straight towards the left. The density altitude is specified in another vertical plane, and always expressed in thousands of feet when being read in the chart.
Rod Yeager is an aviation enthusiast who is an advocate and avid fan of using an Online Ground School to learn more about aviation. Check out his Online Ground School and find out more.
Flight Training: Why you Should Get Spin Training
Here is a perfect example of why you should get spin training when you are doing your
Flight Training:
for a pilot license.
Back in 1992, after I had been instructing for a few years, I was in the local FBO’s office where I worked. I was waiting for one of my students to come back from a solo flight. When my student came in, he looked as though he had just seen a ghost. He was shaking and sweating I asked him what happened. The answer that I got was one that most flight instructors would not want to hear: “I was practicing stalls in the practice area, and all of a sudden I was upside down, and then just spinning toward the ground I didn’t know what to do, but I heard your voice tell me to pull the power back and just let go of the control column, and the plane will stabilize.”
If you know anything about small Cessnas, they tend to have a forward CG and will recover if you just let go of the controls for a second—that is, if you are not in a fully developed spin. So that is what the student did. Even more upsetting was when he stated the fact that, once the plane stopped spinning and the nose started to come up, the altimeter was reading about 1,800–1,900 feet.
If you fly in the Phoenix area, you know that the ground elevation is approximately 1,500 feet MSL. So my student recovered about 300 to 400 feet about the ground. This is far below normal traffic patterns. Would you like this to happen to you? Because it can happen to you. Or would you rather have an instructor go over spin entries and recoveries with you?
I was taking aerobatic flight lessons at the time and had practiced plenty of 3- to 4-turn spins, so I got the parachutes on, and up we went. I started demonstrating spins and spin entries, and he just kept saying, "Nope, that is not what happened.” It finally dawned on me what had happened, and I asked him. Sure enough, I had hit the nail on the head.
The spin my student got himself into was one of the worst cases you could imagine. He was practicing power-off stalls, so the normal recovery procedure is to lower the nose, add full power, and start retracting flaps ten degrees at a time.
Little did my student know that the plane had started to enter the spin when he added full power. The result was a torque roll that placed the plane upside down at first, then continued to spin with the help of the full-power setting. I didn’t think that a 152 was capable of that, but sure enough, it was. So he pulled the power and let go of it, recovering about 400 feet above the ground.
I think every pilot out there should do some type of spin training. Now that I don’t have an aerobatic airplane, I do a flight that shows students how to enter and recover from the spin. This is not a full spin lesson, but it shows the student what to expect. If the student does get himself in trouble, I will let them go as long as I can.
When I had a Cessna 152 Aerobat, I would do spins and basic aerobatics with every student who wouldn’t put the plane over weight. Most students would be a little scared, but after the first of two flights, they couldn’t wait to do the second one.
If you can get up and do this before you solo, I suggest not doing it in an extra 300. Yes, it will be a fun time, but you won’t get the feel of the plane you are normally flying. If you can’t do it in an Aerobat, try to get in a Citabria or Super Decathlon. Use a plane that will be a little sluggish to simulate the plane you are training in.
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Ok, is this normal in real life?
In fsx, when I set the weather to stormy, any jet (say a 747-400) will display unusual readings on the altimeter, airspeed indicator, and heading indicator! This applies to all aircraft, even the Cessna 172!
The altimeter and airspeed indicator will practically jump 15 knots above and below the correct reading, the indicators are calibrated correctly, I reseted them about 3 times!
Even when taxing on the ground, I noticed that the airspeed indicator was reading 15 knots, when in reality, it is 0 (brakes on and thrust idle)
This only happens when I switch to Instrument meteorological conditions. I need to practice flying without visibility.
So is this normal?
The altimeter, airspeed and VSI are driven by combinations of local ambient air pressure (static pressure) and ram air pressure (total pressure). Turbulence is air in movement, so it will cause fluctuating pressures on the instrument sensors, and fluctuating readings.
The heading indicator may be affected by a sideway gust of air striking the vertical stabilizer or fuselage side.
NTSB releases preliminary report on fatal Butte plane crash
The National Transportation Safety Board has released its preliminary report on a plane crash near the Bert Mooney Airport in Butte that claimed the life of one man.
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