Weather Take-Home Test Prep Study Sheet
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1AVIA 123 – Chapter 14 Study Guide - IMC
1. IMC = ________ ____________ __________and refers to a state of the
atmosphere where ________ and ________ are below specific minimum
________14-1
2. The counterpart to IMC is VMC = ________ ____________ __________14-2
3. Category, Meanings and Ceiling and Visibility for VMC and IMC conditions are 14-2
Category
(meaning)
Ceiling
Visibility
a. VFR
___________________
____________
__________
b. MVFR
___________________
____________
__________
c. IFR
___________________
____________
__________
d. LIFR
___________________
____________
__________
4. There are four visibilities of consequence in aviation
a. __________– the distance the observer or machine reports
b. _______ __________ ________- the Oblique distance at which a pilot
can see landing aids such as runway lights and markings.
c. _______ _______– Visibility from the Control Tower
d. _______ _______– Visibility measured straight up 14-3
5. The four kinds of fog – and the causes – are: 14-4
a. ____________ fog – Contact Cooling
b. ___________ fog – Contact Cooling
c. _______ fog – Adiabatic Cooling
d. ___________ fog – Evaporation that causes Saturation
e. ____ Fog – Radiation cooling below freezing
6. The most common causes of lowered visibility are 14-4/7/8/9
a. FG – _______
b. FU – _______
c. HZ – _______
d. DU – _______
e. _____ – a concentration of _____ (FU) and exhaust (nitrogen dioxide NO
)
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f. BLDU – _______ _______
g. BLSN – _______ _______
7. A weather depiction chart shows current _______ and _______, and a pilot can
rapidly assess which areas of the US are _______, _______, and _______. Some
weather depiction charts include actual _______ (precipitation) _______ _______,
_______, and _______. 14-4
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