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Principles of instrument flight
Flight Instrument systems
115
Aviation
Undergraduate 1
11/15/2010

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Term
your aircraft had the static pressure system and altimeter tested and inspected on january 5, of this year , and was found comply with FAA standards. These systems must be re-inspected and approved for use in controlled airspace under IFR by
Definition
January 31, 2 years hence
Term
an aircraft altimeter system test and inspection must be accomplished within.
Definition
24 calender months.
Term
an aircraft operated under 14 CFR part 91 IFR is required to have which of the following?
Definition
Gyroscopic direction indicator
Term
you check the flight instruments while taxiind and find the vertical speed indicator (VSI) indicates a descent of 100 feet per minute. In this case you
Definition
may take off and use 100 feet descent as the zero indication.
Term
under what condition is pressure altitude and identity altitude the same value?
Definition
at standard temperature
Term
under which condition will pressure altitude be equal to true altitude?
Definition
when standard atmospheric conditions exist
Term
which condition would cause the altimeter to indicate a lower altitude than actually flown (true altitude)?
Definition
air temperature warmer than standard.
Term
when altimeter is changed from 30.11 inches Hg to 29.96 inches Hg in which direction will the indicated altitude change and by what value?
Definition
Altimeter will indicate 150 feet lower.
Term
Under what condition will true altitude be lower than indicated altitude with an altimeter setting of setting of 29.92 inches Hg?
Definition
In colder than standard air temperature.
Term
Which of the following defines the type of altitude used when maintaining FL 210?
Definition
Pressure
Term
Altimeter setting ie the value to which the scale of the pressure altimeter is set so the altimeter indicates
Definition
true altitude at field elevation
Term
what CAS must be used to maintain the filed TAS at the flight planned altitude if the outside air temperature is -5 degree C
Definition
139 KCAS
Term
What Cas must be used to maintain the filed TAS at the flight planned altitude if the outside air temperature is +8 degree C
Definition
157 KCAS
Term
what CAS must be used to maintain the filed TAS at the flight planned altitude if the outside air temperature is +05 degrees C
Definition
129 KCAS
Term
What CAS must be used to maintain filed TAS at the flight planned altitude if the outside air temperature is +5 degrees C
Definition
147 KCAS
Term
What CAS must be used to maintain the filed TAS at the flight planned altitude? (Temperature 0 degrees C)
Definition
140 KCAS
Term
What CAS should be the filed TAS if the outside air temperature is + 05 degrees C
Definition
119 KCAS
Term
What CAS should be used to maintain the filed TAS at the flight planned altitude if the the outside air temperature is +05 degree C
Definition
133 KCAS
Term
How should your preflight check the altimeter prior to the IFR flight
Definition
set the altimeter to the current altimeter setting the indication should be within 75 feet of the actual elevation for acceptable accuracy .
Term
what is the procedure for the altimeter when assigned an IFR altitude of the 18,000 feet or higher on a direct flight off airways?
Definition
set the altimeter to the current reported setting for the climbout 29.92 inches Hg upon reaching 18,000 feet.
Term
In what localities is advection fog most likely to occur?
Definition
in coastal areas
Term
Frontal waves normally form on
Definition
Frontal waves and cyclones (areas of low pressure) usually form on slow-moving cold fronts or stationary fronts.
Term
Which of the following combinations of weather producing variables would likely result in cumuliform-type clouds, good visibility, rain showers, and possible clear-type icing in clouds?
Definition
unstable, moist air, and orographic lifting
Term
To which meteorological condition does the term 'dew point' refer?
Definition
the temperature to which air must be cooled to become saturated
Term
An aircraft that encounters a headwind of 45 knots, within a microburst, may expect a total shear across the microburst of
Definition
90 knots
Term
Test data indicate that ice, snow, or frost having a thickness and roughness similar to medium or coarse sandpaper on the leading edge and upper surface of an airfoil can
Definition
reduces lift by as much as 30 percent and increase drag by up to 40 percent.
Term
Where do squall lines most often develop?
Definition
Ahead of the cold front
Term
A temperature inversion will normally form only
Definition
in stable air
Term
Hazardous wind shear is commonly encountered near the ground
Definition
during periods of strong temperature inversion and near thunderstorms.
Term
The average height of the troposphere in the middle latitudes is
Definition
37,000 feet
Term
What temperature condition is indicated if wet snow is encountered at your flight altitude?
Definition
the temperature is above freezing at your altitude
Term
In which meteorological environment is aircraft structural icing most likely to have the highest rate of accumulation?
Definition
freezing rain
Term
The presence of ice pellets at the surface is evidence that
Definition
there is freezing rain at a higher altitude
Term
What are the four families of clouds?
Definition
high clouds, middle clouds, low clouds, and clouds with extensive vertical development.
Term
Maximum downdrafts in a microburst encounter may be as strong as
Definition
6,000 feet per minute
Term
Where can wind shear associated with a thunderstorm be found? Choose the most complete answer.
Definition
Wind shear can be found on all sides of a thunderstorm cell and in the downdraft directly under the cell.
Term
If you fly into severe turbulence, which flight condition should you attempt to maintain?
Definition
level flight attitude
Term
What feature is associated with a temperature inversion?
Definition
a stable layer of air
Term
Fair weather cumulus clouds often indicate
Definition
Fair weather cumulus clouds often indicate bumpy turbulence beneath and in the clouds but good visibility.
Term
The aircraft in position 3 will experience which effect in a microburst encounter?
Definition
strong downdraft
Term
When passing through an abrupt wind shear which involves a shift from a tailwind to a headwind, what power management would normally be required to maintain a constant indicated airspeed and ILS glide slope?
Definition
Power should first be reduced to correct this condition. Power should be further reduced as the aircraft proceeds through the wind shear, then increased.
Term
Under which condition does advection fog usually form?
Definition
moist air moves over colder ground or water.
Term
Thrust is managed to maintain IAS, and glide slope is being flown. What characteristics should be observed when a headwind shears to be a constant tailwind?
Definition
When a headwind shears to a constant tailwind: the nose pitches down, thrust must be increased initially to resume normal approach speed and then reduced as the airspeed stabilizes, vertical speed increases, and indicated airspeed decreases and then increases to approach speed.
Term
During an IFR cross-country flight you picked up rime icing which you estimate is 1/2" thick on the leading edge of the wings. You are now below the clouds at 2000 feet AGL and are approaching your destination airport under VFR. Visibility under the clouds is more than 10 miles, winds at the destination airport are 8 knots right down the runway, and the surface temperature is 3 degrees Celsius. You decide to
Definition
Ice will accumulate unevenly on the airplane. It will add weight and drag, and decrease thrust and lift. With ice accumulations, landing approaches should be made with a minimum wing flap setting and with an added margin of airspeed. Sudden and large configuration and airspeed changes should be avoided.
Term
What are the characteristics of stable air?
Definition
poor visibility, steady precipitation, and stratus type clouds
Term
When penetrating a microburst, which aircraft will experience an increase in performance without a change in pitch or power?
Definition
At position 1 the aircraft is in the outflow, initially experiencing a headwind with little or no downdraft resulting in a temporary performance increase.
Term
What is indicated by the term 'embedded thunderstorms'?
Definition
thunderstorms are quite visible to the pilot. However, when a thunderstorm is present but not visible to the pilot due to cloud cover, such as a thick stratus layer, the thunderstorm is said to be 'embedded.
Term
Which clouds have the greatest turbulence?
Definition
cumulonimbus
Term
If the air temperature is +8°C at an elevation of 1,350 feet and a standard (average) temperature lapse rate exists, what will be the approximate freezing level?
Definition
5,350 feet msl
Term
Unsaturated air flowing up slope will cool at the rate of approximately (dry adiabatic lapse rate)
Definition
3°C (5.4°F) per 1,000 feet.
Term
Unsaturated air flowing up slope will cool at the rate of approximately (dry adiabatic lapse rate)
Definition
3°C (5.4°F) per 1,000 feet.
Term
If squalls are reported at your destination, what wind conditions should you anticipate?
Definition
A squall is a sudden increase in speed of at least 16 knots to a sustained speed of 22 knots or more, lasting for at least one minute.
Term
What is the expected duration of an individual microburst?
Definition
An individual microburst will seldom last longer than 15 minutes from the time it strikes the ground until dissipation. However, there may be multiple microbursts in the area.
Term
Which is a characteristic of low-level wind shear as it relates to frontal activity?
Definition
Data compiled on wind shear indicates that the amount of shear in warm fronts is much greater than that found in cold fronts.
Term
Which precipitation type normally indicates freezing rain at higher altitudes?
Definition
Ice pellets always indicate freezing rain at higher altitudes.
Term
Which procedure is recommended if a pilot should unintentionally penetrate embedded thunderstorm activity?
Definition
Don't change power settings; maintain settings for reduced airspeed.
Term
What enhances the growth rate of precipitation?
Definition
Upward currents
Term
What causes surface winds to flow across the isobars at an angle rather than parallel to the isobars?
Definition
Surface friction
Term
The amount of water vapor which air can hold largely depends on
Definition
air temperature
Term
What types of fog depend upon a wind in order to exist?
Definition
Advection fog and upslope fog
Term
What are some characteristics of unstable air?
Definition
turbulence and good surface visibility
Term
In which situation is advection fog most likely to form?
Definition
an air mass moving inland from the coast in winter
Term
Which force, in the Northern Hemisphere, acts at a right angle to the wind and deflects it to the right until parallel to the isobars?
Definition
Coriolis
Term
Which weather phenomenon is always associated with the passage of a frontal system?
Definition
a wind change
Term
A common type of ground or surface based temperature inversion is that which is produced by
Definition
ground radiation on clear cool nights when the wind is light.
Term
What is an operational consideration if you fly into rain which freezes on impact?
Definition
temperatures are above freezing at some higher altitude
Term
If involved in a microburst encounter, in which aircraft positions will the most severe downdraft occur?
Definition
The strongest downdraft occurs at point 3. Although there is also downdraft at points 2 and 4, the correct answer is C (3 and 4) because the combination of downdraft and tailwind at 4 has a more negative effect on performance than the combination of downdraft and headwind at 2.
Term
What is an indication that downdrafts have developed and the thunderstorm cell has entered the mature stage?
Definition
Precipitation beginning to fall from the cloud base signals that a downdraft has developed and a cell has entered the mature stage.
Term
While flying a 3° glide slope, a headwind shears to a tailwind. Which conditions should the pilot expect on the glide slope?
Definition
When a headwind shears to a tailwind the airspeed decreases, the nose pitches down, and the aircraft will begin to drop below the glide slope.
Term
Which family of clouds is least likely to contribute to structural icing on an aircraft?
Definition
high clouds
Term
What relationship exists between the winds at 2,000 feet above the surface and the surface winds?
Definition
Close to the earth, wind direction is modified by the contours over which it passes and wind speed is reduced by friction with the surface. Also, the winds at the surface are at an angle across the isobars due to the stronger pressure gradient. At levels 2,000 feet above the surface, the speed is greater and the direction is usually parallel to the isobars.
Term
What are the requirements for the formation of a thunderstorm?
Definition
For a thunderstorm to form, the air must have:
1. Sufficient water vapor,
2. An unstable lapse rate, and
3. An initial upward boost (lifting) to start the storm process in motion.
Term
A high cloud is composed mostly of
Definition
ice crystals
Term
A pilot reporting turbulence that momentarily causes slight, erratic changes in altitude and/or attitude should report it as
Definition
light turbulence
Term
The presence of standing lenticular altocumulus clouds is a good indication of
Definition
very strong turbulence
Term
Which is a characteristic of stable air?
Definition
stratiform clouds
Term
Which is a characteristic of stable air?
Definition
stratiform clouds
Term
The suffix 'nimbus', used in naming clouds, means a
Definition
rain cloud
Term
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?
Definition
A wind shear zone develops between the calm and the stronger winds above. Eddies in the shear zone cause airspeed fluctuations as an aircraft climbs or descends through the inversion.
Term
What is an important characteristic of wind shear?
Definition
Wind shear may be associated with either a wind shift or a wind speed gradient at any level in the atmosphere. Low-level wind shear may result from a frontal passage, thunderstorm activity, or low-level temperature inversion. Wind shear may also be found at higher altitudes in association with a frontal passage due to wind shift through the frontal zone.
Term
Why is frost considered hazardous to flight operation?
Definition
Frost does not change the basic aerodynamic shape of the wing, but the roughness of its surface spoils the smooth flow of air, thus causing a slowing of the airflow. This slowing of the air causes early air flow separation over the affected airfoil, resulting in a loss of lift.
Term
If severe turbulence is encountered during your IFR flight, the airplane should be slowed to the design maneuvering speed because the
Definition
If during flight, rough air or severe turbulence is encountered, the airspeed should be reduced to maneuvering speed or less, to minimize the stress on the airplane structure.
Term
When a climb or descent through an inversion or wind-shear zone is being performed, the pilot should be alert for which of the following change in airplane performance?
Definition
a sudden change in airspeed
Term
What type clouds can be expected when an unstable air mass is forced to ascend a mountain slope?
Definition
cloudiness shows extensive vertical development.
Term
Where does wind shear occur?
Definition
Wind shear may be associated with either a wind shift or a wind speed gradient at any level in the atmosphere.
Term
How much colder than standard temperature is the forecast temperature at 9,000 feet, as indicated in the following excerpt from the Winds and Temperature Aloft Forecast?
FT 6000 9000
0737-04 1043-10
Definition
7 degree C
Term
A characteristic of the stratosphere is
Definition
Above the tropopause is the stratosphere. This layer is typified by relatively small changes in temperature with height except for a warming trend near the top.
Term
While flying a 3° glide slope, a constant tailwind shears to a calm wind. Which conditions should the pilot expect?
Definition
Initially, the IAS and pitch will increase and the aircraft will balloon above the glide slope.
Term
A jet stream is defined as wind of
Definition
50 knots or greater
Term
Which are characteristics of an unstable cold air mass moving over a warm surface?
Definition
Characteristics typical of an unstable air mass are cumuliform clouds, turbulence, and good visibility.
Term
The primary cause of all changes in the Earth's weather is
Definition
Differences in solar energy create temperature variations.
Term
The most frequent type of ground- or surface-based temperature inversion is that produced by
Definition
radiation on a clear, cool nights when wind is light. The ground radiates and cools much faster than the overlying air.
Term
Standing lenticular clouds, in mountainous areas, indicate
Definition
turbulence
Term
What effect will a microburst encounter have upon the aircraft in position 4?
Definition
strong tailwind and the performance decreases
Term
Which weather phenomenon is always associated with a thunderstorm?
Definition
lightening
Term
Which conditions are favorable for the formation of radiation fog?
Definition
clear skies, little or no wind, and small temperature/dewpoint spread (high relative humidity).
Term
Which conditions result in the formation of frost?
Definition
the air temperature must be below the dew point and the dew point of the surrounding air must be colder than freezing. Water vapor will then sublimate directly as ice crystals or frost.
Term
Which thunderstorms generally produce the most severe conditions, such as heavy hail and destructive winds?
Definition
A squall line
Term
What is an important characteristic of wind shear?
Definition
frontal passage, thunderstorm activity, or low-level temperature inversion.
Term
The general characteristics of unstable air are
Definition
Characteristics typical of an unstable and a stable air mass are shown in the figure.
Term
Winds at 5,000 feet AGL on a particular flight are southwesterly while most of the surface winds are southerly. This difference in direction is primarily due to
Definition
Friction between the wind and the surface slows the wind.
Term
What type of clouds will be formed if very stable moist air is forced up slope?
Definition
cloudiness is flat and stratified.
Term
Which weather condition can be expected when moist air flows from a relatively warm surface to a colder surface?
Definition
fog
Term
Clouds, fog, or dew will always form when
Definition
water vapor condenses
Term
During the life cycle of a thunderstorm, which stage is characterized predominately by downdrafts?
Definition
dissipating
Term
Which weather phenomenon signals the beginning of the mature stage of a thunderstorm?
Definition
the start of rain at the surface
Term
Steady precipitation, in contrast to showers, preceding a front is an indication of
Definition
Stratiform clouds are associated with stable air with little or no turbulence
Term
Stability can be determined from which measurement of the atmosphere?
Definition
ambient temperature lapse rate
Term
How will the aircraft in position 4 be affected by a microburst encounter?
Definition
performance decrease. The wind contours indicate a strong downdraft and increasing tailwind
Term
Which feature is associated with the tropopause?
Definition
An abrupt change in temperature lapse rate characterizes the tropopause.
Term
What situation is most conducive to the formation of radiation fog?
Definition
warm, moist air over low, flatland areas on clear, calm nights.
Term
An air mass is a body of air that
Definition
covers an extensive area that has fairly uniform temperatures and moisture content, the body of air (or air mass) acquires the temperature/moisture properties of the geographical
Term
Fog is usually prevalent in industrial areas because of
Definition
Abundant condensation nuclei enhance the formation of fog.
Term
What determines the structure or type of clouds which form as a result of air being forced to ascend?
Definition
the stability of the air before lifting occurs
Term
The strength and location of the jet stream is normally
Definition
weaker and farther north in the summer
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