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Saturday 30th August 2008
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Brainteasers Interactive Quiz #24:
Cold-Weather Flying

Cold-weather flying requires a specialized set of pilot skills and knowledge in order to be accomplished safely. Just as you wouldn't drive your car in severe winter weather without the proper preparation, the same is true for flying an aircraft under such conditions. Try your hand at Irv Siegel's latest interactive quiz and see if you're ready to tackle the winter flying season.

by Irv Siegel

The material for this Brainteaser is taken from several issues of the FAA's monthly magazine Aviation News, and also from the following FAA publications:

  • Tips on Winter Flying (FAA-P-8740-24)
  • Cold Weather Operation of Aircraft (AC91-13C)

Answer the questions as best you can, then click on the "score" button to see your score and read the explanations. If you don't like your score the first time around, you can change some of your answers and resubmit. To get the most out of this quiz, we suggest you keep trying until you get a perfect score.

1. The electrolyte in a discharged battery will freeze at _______ temperature than with
a. a warmer
b. a colder
c. the same
2. Lycoming and Continental recommend preheating prior to engine start when the outside
a. 0 degrees and 10 degrees
b. 10 degrees and 20 degrees
c. 20 degrees and 30 degrees
d. 30 degrees and 40 degrees
temperature is below _____F and _____F, respectively.

3. After priming an engine that uses a carburetor with an accelerator pump, how long
a. 10 seconds
b. 20 seconds
c. 30 seconds
d. 60 seconds
should you wait before cranking the engine?

4. When starting an engine that uses a carburetor without an accelerator pump, what can
a. Nothing.
b. Pump the throttle quickly.
c. Leave the primer out after priming and close the throttle all the way. As soon as
d. Pull the carburetor heat control to the full hot position.
the key is turned, push in the primer.

5. What is the most likely cause of iced-over of sparkplug electrodes?
a. The air temperature is less than 32 degrees F and the humidity is greater than 50%.
b. The summer sparkplugs have not been replaced with the appropriate winter sparkplugs.
c. The winterization baffles have not been installed, or were installed improperly.
d. An unpreheated engine either fired but quit after only a few revolutions, or was
idling at a very low power setting.

6. Generally speaking, the amount of time you must wait for your oil pressure gauge to
a. about the same as in the summer.
b. shorter, because the thicker oil creates more pressure initially than does the
c. longer, because the cold, congealed oil takes longer to reach the oil pressure gauge
pickoff than in the summer.


register after starting in cold winter temperatures will be:


thinner oil in the summer.

7. You are flying an aircraft that has an engine rated at 180 horsepower at sea level
a. 200 hp
b. 190 hp
c. 185 hp
d. 180 hp
e. 175 hp
on a standard day. What power output (approximately) will you get if the actual
temperature for a full-throttle sea-level takeoff is 0 degrees F?

8. Cylinder head temperatures during a climb on a cold day will:
a. generally be cooler than on a hot day.
b. may be hotter if winterization baffles installed for cold weather operation restrict
c. always be the same if the same climb speed is used.
cooling air flow, especially if there's an extreme temperature inversion.


d. Either a or b can occur
9. While flying under IFR in controlled airspace, you encounter an area of severe icing
a. engage the autopilot to prevent overcontrolling.
b. disengage the autopilot and hand-fly the aircraft.
c. advise ATC and promptly exit the conditions using control inputs as smooth and as
conditions. You should:


d. both a and c.
e. both b and c.
small as possible.

10. Which of the following typically signal the potential for or possibility of
a. temperature below freezing combined with visible moisture.
b. decreasing airspeed at constant power and altitude.
c. both a and b.
d. neither a nor b.
in-flight structural icing?

11. What intensity of ice accumulation require occasional use of in-flight
a. Trace.
and if deicing/anti-icing equipment is not used?


b. Light.
c. Moderate.
d. Severe.
deicing/anti-icing equipment, and may create a problem for exposure longer than one hour
12. In stratiform clouds, you can likely alleviate icing by changing to an altitude
a. 0 degrees C.
b. minus 5 degrees C.
c. minus 10 degrees C.
d. minus 20 degrees C.
with an above-freezing temperature, or to one colder than:

13. In which type of clouds are you most likely to find that the icing layer is
a. cumulus.
b. stratus.
c. cirrus.
thickest vertically?

14. In which type of clouds are you most likely to find that icing occurs over a large
a. cumulus
area horizontally?


b. stratus
c. cirrus
15. If you experience headache, drowsiness, or dizziness in flight, what should you
a. Hypothermia. Increase cabin heat.
b. Low blood sugar. Eat a piece of fruit or hard candy.
c. Carbon monoxide poisoning. Shut off the cabin heater and open all air vents. Use
suspect? What should you do?

100% oxygen, if available. Land as soon as possible.

16. If you make a forced landing in the winter, what is the most important item in your
a. matches, or other reliable fire-starting equipment.
b. water.
c. food.
d. handheld transceiver.
e. cellular telephone.
survival kit?


If you enjoyed taking this interactive quiz and would like to see more like it, please let us know. And if you thought it was unfair, confusing, or a waste of time, we'd like you to tell us that, too. And if you have an idea for a subject that you think would make a good future Brainteaser quiz, be sure to let us know.

Return to the AVweb Brainteasers page.






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If you enjoyed taking this interactive quiz and would like to see more like it, go to the AVweb Brainteaser page. And if you thought it was unfair, confusing, or a waste of time, we'd like you to tell us that, too. And if you have an idea for a subject that you think would make a good future Brainteaser quiz, be sure to let us know.

Return to the AVweb Brainteasers page.

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