Applied Learning Assignment #1
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Purdue University *
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Feb 20, 2024
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AT 325 – ALA #1
Applied Learning Assignment #1
21 points + 2 points bonus
Instructions
Answer the following questions as completely as possible. Include as much detail as possible to aid in grading your response. That is, it is critical to include screenshots or copies of maps, METARs, and any other data sources that you use.
Questions
1.
(1 point) You’re at an international airfield that reports an altimeter setting (ALSTG)
of 1017 hectopascals. You’re slightly confused, but you calculate what the setting would be in inches Hg.
a.
What is the ALSTG in inHg?
2.
(1 point) Identify the warmer temperature in each temperature pairing below.
a.
32° C
89° F
b.
24° C
77° F
c.
20° C
67° F d.
5° C
40° F
e.
-16° C
4° F
3.
(3 points) Assuming the pressure is the same, and you are at sea level in ISA, which of the following air has 1) a higher relative humidity, 2) a higher absolute humidity, 3) is denser? [hint: complete the calculations for each scenario and compare]
a.
Temperature of 73° F and a dew point of 70° F
b.
Temperature of 28° C and a dew point of 22° C
c.
Temperature of 46° F and a dew point of 44° F
d.
Temperature of 13° C and a dew point of 11° C
4.
(3 points) For a specific location on Earth, which one of the following four factors do
you believe has the greatest effect on surface temperature?
a.
Cloud cover
b.
Season
c.
Latitude
d.
Relationship to large body of water
Why do you believe this? (3-4 well thought out sentences.)
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AT 325 – ALA #1
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AT 325 – ALA #1
5.
(1 point) What is the water phase-change process called when the following occurs?
a.
Water droplets form on an aircraft while sitting overnight, even though there
hasn’t been any precipitation and no one washed the aircraft:
b.
Ice on the runway turns to water:
c.
You’re flying above the freezing level and you see a snowflake that appears to
form out of nothing (you have great eyesight):
d.
Snow on the runway disappears without turning into water:
6.
(2 points) Using a current METAR, what is the Pressure Altitude at the following two
airfields? Perform the calculation long-hand and show your work. Include screenshots of the METARs used.
a.
Daytona Beach, FL (KDAB):
b.
Copy of KDAB METAR:
c.
Prescott, AZ (KPRC):
d.
Copy of KPRC METAR:
7.
(6 points) Using a current METAR, what is the Density Altitude at the following two airfields? Perform the calculation long-hand and show your work. Then perform a second calculation using a surface temperature of 90°F (which can occur during afternoon hours during summer) while using the same data for the other variables used in the first calculation. For the second calculation, quantify or describe the impact on take-off for a Piper Archer. Include screenshots of the METARs used.
a.
Purdue University, IN (KLAF) (Calculation 1):
b.
Purdue University, IN (KLAF) (Calculation 2):
i.
Impact on Piper Archer:
c.
Copy of KLAF METAR:
d.
Flagstaff, AZ (KFLG) (Calculation 1):
e.
Flagstaff, AZ (KFLG) (Calculation 2):
i.
Impact on Piper Archer:
f.
Copy of KFLG METAR:
8.
(2 points) Presume a work stoppage must occur immediately to ensure the safety of aviation ground support members when the surface Heat Index reaches 107°F. If the surface air temperature is 96°F, what is the dew point temperature at which a work stoppage would occur? How did you arrive at this answer? [Assume cloudy conditions with light winds, which is what a Heat Index table is based upon.]
a.
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AT 325 – ALA #1
9.
(2 points) Using current METARs, list 2 airfields located in 2 different states within the U.S. where the surface dew point depression is 0 degrees. For each airfield listed, what was the surface visibility, the wind direction and speed, and the current weather (if any) reported at the same time? Write your answer in a decoded format.
a.
Airfield 1 METAR:
b.
Airfield 1 surface visibility
c.
Airfield 1 wind direction and speed:
d.
Airfield 1 current weather (if any):
e.
Airfield 2 METAR:
f.
Airfield 2 surface visibility
g.
Airfield 2 wind direction and speed:
h.
Airfield 2 current weather (if any):
10.
BONUS
. (2 points) Based on a current METAR, you are told that there is a surface inversion at the Purdue airport up to an altitude where the pressure is 870 mb.
Based on the ALSTG at the current time and using ISA, at what altitude MSL does the
inversion stop (i.e., the altitude at which the maximum temperature is reached)? Explain or show your work as to how you answered this. Why, in this case, is this answer not as accurate as it otherwise might be, or, if you believe your answer is extremely precise, why do you believe that?
a.
Copy of METAR:
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