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WX 301 EXAM 1 LATEST UPDATE
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WX 301 EXAM 1 LATEST UPDATEList three common units of atmospheric pressure - ANSWER inches of mercury
(HG), Millibars (MB), and hector-pascals (hPa)
difference between station pressure and sea level pressure - ANSWER station
pressure: the pressure measured directly by a barometer. Minor corrections for
temperature and latitude
Sea level pressure: the station pressure corrected for altitude. Multiple ways to
correct for altitude
Explain the difference between the altimeter setting and "actual" sea level pressure
- ANSWER altimeter setting: FAA uses a constant "Standard Atmosphere.
Independent of weather and location
Sea Level Pressure: NWS uses current and past 12 hr temperature combined with
climatology for the site. Weather and location
Identify the altitude a pressure altimeter will read when the Kollsman window is set
to the "standard" mean sea-level pressure - ANSWER 29.92
Identify the altitude a pressure altimeter will read when the Kollsman window is set
to the current altimeter setting. - ANSWER mean sea level
List the three most common errors in altimeter reading - ANSWER sea level
pressure, temperature (cold and hot), and strong vertical gust (mountain and
thunderstorm)
Identify the only altimeter error that the altimeter setting corrects - ANSWER sea
level pressure
Describe the effects of both changes in surface pressure and changes in temperature
on altimeter readings. - ANSWER Temperature: during cold weather vertical
separation is necessary and make sure to have extra altitude.
Surface Pressure: when flying in high you are fine but flying in cold you need to
adjust altitude.
, Describe the impact of non-standard temperatures on density altitude - ANSWER
Low-density altitude increases performance--air is denser and provides greater lift
and thrust
High density altitude can be hazardous, especially if an aircraft is critically loaded.
Describe the effect of high density altitudes on aircraft performance - ANSWER
Additional engine power to compensate for low density air
Slower rates of climb
Longer take-off and landing rolls
RA - ANSWER RAIN
SN - ANSWER SNOW
BR - ANSWER MIST
FG - ANSWER FOG
SHRA - ANSWER RAIN SHOWER
TSRA - ANSWER THUNDER STORM
CAVOK - ANSWER (Clouds and visibility OK) will replace the visibility,
weather, and clouds sections if: The prevailing visibility is 10 kilometers or more
There are no clouds below 1500 meters (5000 feet) or the minimum sector altitude
There are no cumulonimbus clouds, precip, shallow fog, duststorms, sandstorms, or
drifting dust, sand, or snow
Q - ANSWER international code for altitmeter setting
P6SM - ANSWER greater than 6 statue miles
9999 is used when - ANSWER P6SM
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