1. ICAO identifier for Hartsfield-Jackson Atlanta International airport is KATL.

2. The field elevation for Hartsfield-Jackson Atlanta International airport is 1026 feet MSL (Mean Sea Level). 3. Data at: 0413 UTC 02 Apr 2023

Temperature:	17.8C ( 64F)
Dewpoint:	1.7C ( 35F) [RH = 34%]
Pressure (altimeter):	30.00 inches Hg (1016.0 mb) [Sea level pressure: 1015.4 mb]

4. Pressure altitude [ft] = Field elevation [ft] + 1000 x (standard altimeter setting [in Hg] - current altimeter setting [in Hg]) Standard altimeter setting [in Hg] = 29.92 in Hg

Pressure altitude [ft] = 1026 ft + 1000 x (29.92 in Hg - 30.00 in Hg) = 1026 ft - 80 ft = 946 ft

5. The pressure ratio at 946 ft = pressure ratio at 0 ft + (pressure ratio at 1000 ft - pressure ratio at 0 ft) x (pressure altitude at 946 ft - pressure altitude at 0 ft) / (pressure altitude at 1000 ft - pressure altitude at 0 ft)

Pressure ratio, at 946 ft = 1.0000 + (0.9644 - 1.0000) x (946 - 0) / (1000 - 0)

Pressure ratio, at 946 ft 0.9663

6. To determine the Temperature Ratio, (theta), we need to convert the given temperature of 17.8C (64F) to an absolute temperature in Kelvin. The standard sea-level temperature is 288.15K.

Converting 17.8C to K:

T(K) = T(C) + 273.15 = 17.8C + 273.15 = 290.95K Therefore, the Temperature Ratio (theta) is:

= (290.95/288.15) 0.9570

7. The Density Ratio, (sigma) can be calculated using the Pressure Ratio, (delta) and Temperature Ratio, (theta) with the following formula:

= / = 0.9663 / 1.0097 = 0.9570

8. To find for Density Altitude, y

y=y₀ + (y₁ + y₀)[( - ₀)/(₁ - ₀)] At a Density Ratio, ₁= 0.9428, the corresponding altitude is y₁ = 2000ft. At a Density Ratio, ₀ = 0.9711, the corresponding altitude is y₀ = 1000 ft.

y = 1000 + (2000+ 1000)[( 0.9750 - 0.9711)/(0.9428- 0.9711)] y = 1498.23 ft

9. Based on the given weather data, the density altitude can be calculated as follows using Density Altitude Calculator

using relative humidity:

I) Density Altitude with 0% relative humidity: 1504 ft II) Density Altitude with 100% relative humidity: 1771 ft

III) The density altitude with 100% relative humidity is higher than the density altitude with 0% relative humidity. This is because air density decreases as humidity increases. When the air is more humid, it contains more water vapor molecules that displace the nitrogen and oxygen molecules that make up the majority of the atmosphere. Water vapor molecules are lighter than nitrogen and oxygen molecules, so this displacement leads to a lower overall air density, which increases the density altitude. In contrast, when the air is drier, it contains fewer water vapor molecules and thus has a higher air density, resulting in a lower density altitude. Therefore, humidity has a significant effect on air density and can impact aircraft performance, especially during takeoff and landing.

Part 2

1. Find the Calibrated Lift-Off Speed [KCAS] using the chart below, a typical example of an aircraft position error correction chart. (Consider that the gear would still be in the down position at lift-off).Keep in mind the instructions said the given lift-off speed is 150 KTS.

The Landing Configuration curve is the same as a "Takeoff curve" (gear is out and some flaps out).

Clean configuration means gear is up and no flaps!

1. Find the Equivalent Lift-Off Speed [KEAS] using your Calibrated Airspeed from #1 above and the Pressure Altitude for your selected airfield (from A). (Compressibility Correction Chart see "Flight Theory and Aerodynamics," Fig 2.12). Comment on your findings. Why was/wasn't the Compressibility Effect in your case negligible?

1.