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WX 301 Exam 1 Study Guide With Questions And 100% ALL SURE ANSWERS
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JACKLINEWX 301 Exam 1 Study Guide With Questions And 100% ALL SURE ANSWERS
Terms in this set (49)
- inches of mercury ("Hg) in aviation
List two common units of atmospheric pressure
- millibars (mb) in meteorology.
Convert between in. of mercury (in. Hg) and 29.921" Hg = 1013.2 mb
millibars (mb)
Station Pressure: pressure measured by a barometer near the surface
Explain the difference between station pressure
Sea-Level Pressure: station pressure corrected for the elevation of that surface
and sea-level pressure (SLP)
*Near the surface, pressure decreases approximately: 1 mb per 10 m or 1 inch Hg per 1,000ft.
SLP: 29.92"Hg/1013.2mb
Describe what is meant by "Standard Atmosphere"
Temp: 59F/15C
Both correct the station pressure
Explain the difference between altimeter setting
SLP is station pressure corrected for the elevation at that surface
and "actual" SLP
Altimeter setting accounts for temperature
Compare how pressure changes with height in a Pressure changes more rapidly with height in a cold atmosphere.
colder layer than in a warmer layer.
WX 301 Exam 1 Study Guide
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, 9/18/24, 8:58 AM
1. True altitude: Your height above mean sea level.
2. Absolute altitude: Your height above the ground.
3. Pressure altitude: Your height above the standard Mean SLP surface of 29.921″ Hg.
5 altitudes commonly used in general aviation
4. Density altitude: Pressure altitude corrected for non-standard temperatures.
5. Indicated altitude - The altitude displayed on your altimeter. Only the same as true altitude
under standard conditions (assuming a calibrated altimeter).
non-standard sea level pressure
List the three most common errors in altimeter
non-standard temperature
readings
strong vertical wind gusts
Estimate the error between true altitude and 1000ft / 1"Hg
indicated altitude when the Kollsman window (or EX: 30.50 vs 30.0 = 500ft difference
BARO) is incorrectly set HIGH TO LOW LOOK OUT BELOW
Height of a pressure surface in the standard atmosphere
Define pressure altitude
P.A always increases as pressure decreases.
Identify the only altimeter error that the altimeter non-standard temperature error
setting corrects
Describe the effects of both changes in surface When temperatures are colder than standard, your true altitude is less than your indicated
pressure and changes in temperature on altimeter altitude (altimeter)
readings.
Describe how surface PA changes with pressure High pressure = less dense air = worse aircraft takeoff/landing performance
rises or falls Lower pressures = better takeoff/landing performance
Define Density Altitude (DA) PA corrected for non-standard temperature and humidity
Describe the impact of non-standard High Temp = Lower air density = Higher DA
temperatures on density altitude Low Temp = Higher air density = Lower DA
Decreases aircraft performance
High DA (hot air) can be hazardous, especially if an aircraft is critically loaded
Describe the effect of high density altitudes on
High DA requires:
aircraft performance
More engine power to compensate for less dense air
Slower rates of climb
Longer take-off and landing rolls
WX
Calculate DA using the 301 Exam
temperature rule of1thumb
Study Guide
ROT: DA increases 120ft for every +1C deviation from standard atmo temp (15C)
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