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B．Every 15 minutes until the AIRMET is canceled.
C．There is a continuous broadcast over selected VORs of Inflight
Weather Advisories.
C
17．Vertical wind shear can be determined directly from the dashed
lines on the tropopause data chart. The vertical wind shear that is
critical for probability of turbulence is
A．4 knots or greater per 1,000 feet.
B．6 knots or more per 1,000 feet.
C．greater than 8 knots per 1,000 feet.
B
18．Which of the following will decrease the holding time during
anti-icing using a two-step process?
A．Apply heated Type 2 fluid.
B．Decrease the water content.
C．Increase the viscosity of Type 1 fluid.
A
19．What information from the control tower is indicated by the
following transmission?
“SOUTH BOUNDARY WIND ONE SIX ZERO AT TWO FIVE, WEST
BOUNDARY WIND TWO FOUR ZERO AT THREE FIVE.
A．A downburst is located at the center of the airport.
B．Wake turbulence exists on the west side of the active runway.
C．There is a possibility of wind shear over or near the airport.
C
20．The TWEB Route Forecasts and Synopses are issued by the
Weather Service Forecast Offices (WSFOs) four times per day
according to time zone. The TWEB forecast is valid for a/an
A．8-hour period.
B．12-hour period.
C．15-hour period.
B
21．Which type of weather can only be directly observed during flight
and then reported in a PIREP?
A．Turbulence and structural icing.
B．Jetstream-type winds and icing.
C．Level of the tropopause and turbulence.
A
22．Which is a disadvantage of the one-step over the two-step
process when deicing/anti-icing an airplane?
A．It is more complicated.
B．The holding time is increased.
C．More fluid is used with the one-step method when large deposits
of ice and snow must be flushed off airplane surfaces.
C
23．Which atmospheric factor causes rapid movement of surface
fronts?
A．Upper winds blowing across the front.
B．Upper low located directly over the surface low.
C．The cold front overtaking and lifting the warm front.
A
24．What is indicated about an air mass if the temperature remains
unchanged or decreases slightly as altitude is increased?
A．The air is unstable.
B．A temperature inversion exists.
C．The air is stable.
C
25．Constant Pressure Analysis Charts contain contours, isotherms
and some contain isotachs. The contours depict
A．ridges, lows, troughs and highs aloft.
B．highs, lows, troughs, and ridges on the surface.
C．highs, lows, troughs, and ridges corrected to MSL.
A
26．How will an area of thunderstorm activity, that may grow to
severe intensity, be indicated on the Severe Weather Outlook Chart?
A．SLGT within cross-hatched areas.
B．APCHG within any area.
C．SVR within any area.
B
27What is the general direction of movement of a hurricane located
in the Caribbean or Gulf of Mexico region?
A．Northwesterly curving to northeasterly.
B．Westerly, until encountering land, then easterly.
C．Counterclockwise over open water, then dissipating outward over
land.
A
28．Why are downdrafts in a mature thunderstorm hazardous?
A．Downdrafts are kept cool by cold rain which tends to accelerate
the downward velocity.
B．Downdrafts converge toward a central location under the storm
after striking the surface.
C．Downdrafts become warmer than the surrounding air and reverse
into an updraft before reaching the surface.
A
29．Freezing Point Depressant (FPD) fluids used for deicing
A．provide ice protection during flight.
B．are intended to provide ice protection on the ground only.
C．on the ground, cause no performance degradation during
takeoff.
B
30．What sources reflect the most accurate information on current
and forecast icing conditions?
A．Low-Level Sig Weather Prog Chart, RADATs, and the Area
Forecast.
B．PIREPs, Area Forecast, and the Freezing Level Chart.
C．PIREPs, AIRMETs, and SIGMETs.
C
31．Anti-icing fluid should provide freezing point protection to
A．-20°F ambient temperature.
B．+32°F outside temperature or below.
C．a freezing point no greater than 20°F below the ambient or
airplane surface temperature.
C
32．What conditions are indicated on a Weather Depiction Chart?
A．Actual sky cover, visibility restrictions, and type of precipitation at
reporting stations.
B．Forecast ceilings and visibilities over a large geographic area.
C．Actual en route weather conditions between reporting stations.
A
1．Assuring that appropriate aeronautical charts are aboard an
　
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