AIRCRAFT DISPATCHER O&P EXAM 300 QUESTIONS
& CORRECT ANSWERS LATEST 2025
What is 14 CFR part 121? - ANSWER-Part 121 - Operating Requirements:
Domestic, Flag, and Supplemental Operations
What is the average height of the tropopause? What is the effect of latitude or
season on the height? - ANSWER-36,000 ft. During the winter or in the polar
regions the height decreases. In the summer or along the equatorial regions it
increases.
What is windshear? - ANSWER-A sudden change in wind speed or direction over a
short distance.
What is the standard temperature lapse rate? - ANSWER-A decrease in
temperature with an increase in altitude (2°c/1000ft) according to ISA standards
up to 36,000 ft at which point it holds at -56.5°c and holds up to about 68,000 ft
(in the tropopause)
What is the standard sea level pressure? - ANSWER-1013.25 hPa/mb or 29.92
inHg
What happens during an inversion? - ANSWER-The temperature lapse rate is
inverted and an increase in altitude results in an increase in temperature.
,What instruments are used to measure air pressure? - ANSWER-Mercury
barometer (on the ground) and aneroid barometer (generally installed on aircraft)
What is the standard pressure lapse rate? - ANSWER-1 inch Hg per 1000 feet in
altitude up to 10,000 ft.
ISA (International Standard Atmosphere) is used for what? - ANSWER-Calibrating
flight instruments
Forecasting aircraft performance
Design and testing of aircraft.
What is an elongated area of low pressure? - ANSWER-A trough.
What is an elongated area of high pressure? - ANSWER-A ridge.
What is a high pressure surrounded by relative low pressure? - ANSWER-A high
center or an anticyclone.
What is a low pressure surrounded by relative high pressure? - ANSWER-A low
center or a cyclone.
What is density altitude? - ANSWER-The pressure altitude corrected for
nonstandard temperature. The airport elevation corrected for pressure and
temperature.
What does METAR stand for? - ANSWER-Aviation Routine Weather Report.
,What are isobars? - ANSWER-Lines of equal pressure
What is the jet stream? - ANSWER-A narrow band of high winds (50-240kts)
located near or in the tropopause where the pressure gradients are the most
significant.
What is low level wind shear? - ANSWER-A wind shear of 10 knots or more per
100 feet in a layer more than 200 feet thick which occurs within 2,000 feet of the
surface.
It means that within the lowest 2000ft, the wind speed and/or direction is
changing rapidly in a 200ft layer.
What is LLWAS? - ANSWER-Low Level Wind Shear Alert System which is
automated and provides a warning of potential wind shear and microbursts.
What is the dewpoint temperature? - ANSWER-The temperature at which the air
is fully saturated
What must exist for clouds or fog to form? - ANSWER-Water vapor, cooling and
condensation nuclei
What is precipitation? - ANSWER-Any form of water particles, liquid or solid that
falls from clouds and reaches Earth's surface.
What is supercooled water droplet? - ANSWER-Water in liquid form that is below
freezing but has no ice nuclei such as dust, dirt or any other particulate in the air.
, What is the lake effect? - ANSWER-when an air mass moves across a body of
water, gaining moisture and dropping it as precipitation .
What are the different types of fog? - ANSWER-There are 5 types, Radiation,
Advection, Upslope, Steam and precipitation induced fog.
Explain advection fog? - ANSWER-Advection fog is caused by warm moist air from
the sea or large body of water moving over a cold surface.
What is the guideline for avoiding (Cumulonimbus) CB clouds? - ANSWER-An
airplane must be at least 20 nm away from the CB cloud when trying to avoid.
What is the adiabatic process? - ANSWER-The process wherein the temperature
changes due to expansion or compression.
What is the impact of icing on an aircraft? - ANSWER-Reduction in lift, increased
weight, increased drag, decreased thrust, lessens effectiveness flight controls,
affect instruments, block windscreens and affect comms.
What are the three basic types of icing and explain them? - ANSWER-Rime ice,
formed on the leading edge of the wing or other surfaces, rough and opaque
because of air trapped inside. Clear ice, formed on leading edge of the wing or
other surfaces, clear and smooth. Hard to remove.
Mixed ice, combo of Rime and clear ice.
What are the four levels of icing? - ANSWER-Trace, Light, Moderate, Severe
& CORRECT ANSWERS LATEST 2025
What is 14 CFR part 121? - ANSWER-Part 121 - Operating Requirements:
Domestic, Flag, and Supplemental Operations
What is the average height of the tropopause? What is the effect of latitude or
season on the height? - ANSWER-36,000 ft. During the winter or in the polar
regions the height decreases. In the summer or along the equatorial regions it
increases.
What is windshear? - ANSWER-A sudden change in wind speed or direction over a
short distance.
What is the standard temperature lapse rate? - ANSWER-A decrease in
temperature with an increase in altitude (2°c/1000ft) according to ISA standards
up to 36,000 ft at which point it holds at -56.5°c and holds up to about 68,000 ft
(in the tropopause)
What is the standard sea level pressure? - ANSWER-1013.25 hPa/mb or 29.92
inHg
What happens during an inversion? - ANSWER-The temperature lapse rate is
inverted and an increase in altitude results in an increase in temperature.
,What instruments are used to measure air pressure? - ANSWER-Mercury
barometer (on the ground) and aneroid barometer (generally installed on aircraft)
What is the standard pressure lapse rate? - ANSWER-1 inch Hg per 1000 feet in
altitude up to 10,000 ft.
ISA (International Standard Atmosphere) is used for what? - ANSWER-Calibrating
flight instruments
Forecasting aircraft performance
Design and testing of aircraft.
What is an elongated area of low pressure? - ANSWER-A trough.
What is an elongated area of high pressure? - ANSWER-A ridge.
What is a high pressure surrounded by relative low pressure? - ANSWER-A high
center or an anticyclone.
What is a low pressure surrounded by relative high pressure? - ANSWER-A low
center or a cyclone.
What is density altitude? - ANSWER-The pressure altitude corrected for
nonstandard temperature. The airport elevation corrected for pressure and
temperature.
What does METAR stand for? - ANSWER-Aviation Routine Weather Report.
,What are isobars? - ANSWER-Lines of equal pressure
What is the jet stream? - ANSWER-A narrow band of high winds (50-240kts)
located near or in the tropopause where the pressure gradients are the most
significant.
What is low level wind shear? - ANSWER-A wind shear of 10 knots or more per
100 feet in a layer more than 200 feet thick which occurs within 2,000 feet of the
surface.
It means that within the lowest 2000ft, the wind speed and/or direction is
changing rapidly in a 200ft layer.
What is LLWAS? - ANSWER-Low Level Wind Shear Alert System which is
automated and provides a warning of potential wind shear and microbursts.
What is the dewpoint temperature? - ANSWER-The temperature at which the air
is fully saturated
What must exist for clouds or fog to form? - ANSWER-Water vapor, cooling and
condensation nuclei
What is precipitation? - ANSWER-Any form of water particles, liquid or solid that
falls from clouds and reaches Earth's surface.
What is supercooled water droplet? - ANSWER-Water in liquid form that is below
freezing but has no ice nuclei such as dust, dirt or any other particulate in the air.
, What is the lake effect? - ANSWER-when an air mass moves across a body of
water, gaining moisture and dropping it as precipitation .
What are the different types of fog? - ANSWER-There are 5 types, Radiation,
Advection, Upslope, Steam and precipitation induced fog.
Explain advection fog? - ANSWER-Advection fog is caused by warm moist air from
the sea or large body of water moving over a cold surface.
What is the guideline for avoiding (Cumulonimbus) CB clouds? - ANSWER-An
airplane must be at least 20 nm away from the CB cloud when trying to avoid.
What is the adiabatic process? - ANSWER-The process wherein the temperature
changes due to expansion or compression.
What is the impact of icing on an aircraft? - ANSWER-Reduction in lift, increased
weight, increased drag, decreased thrust, lessens effectiveness flight controls,
affect instruments, block windscreens and affect comms.
What are the three basic types of icing and explain them? - ANSWER-Rime ice,
formed on the leading edge of the wing or other surfaces, rough and opaque
because of air trapped inside. Clear ice, formed on leading edge of the wing or
other surfaces, clear and smooth. Hard to remove.
Mixed ice, combo of Rime and clear ice.
What are the four levels of icing? - ANSWER-Trace, Light, Moderate, Severe
