Ice

Question 1

1470
Which conditions result in the **formation of frost*?

Answer 1

Temperature of the collecting surface is below the dewpoint of surrounding air and the dewpoint is colder than freezing.

Formation o/Frost: Colder than freezing

Question 2

1472
Why is frost considered hazardous to flight operation?

Answer 2

Frost causes early airflow separation resulting in a loss of lift.

Question 3

1473
In which meteorological environment is aircraft structural icing most likely to have the highest rate of accumulation?

Answer 3

Freezing rain.

Question 4

1475
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.

Answer 4

reduce lift by as much as 30 percent and increase drag by 40 percent.

30 40

Question 5

2379
Where would you first expect to see ice formation?

Answer 5

Small and/or narrow objects.

Question 6

2520
Frost adhering to the wing will

Answer 6

decrease the margin of airspeed above stall.

Frosty Wing: DAAS

Question 7

2725
What aircraft performance can be expected with structural icing?

Answer 7

Unpredictable flight characteristics.

Question 8

2759
Even a small amount of accumulated ice is hazardous because it

Answer 8

increases weight and adversely impacts lift.

Question 9

2760
One visual indication of conditions favorable to supercooled large droplet icing is

Answer 9

droplets that splash or splatter on impact at temperatures below +5*C.

Question 10

2762
While en route on an IFR flight, you receive a report of moderate icing along your route. This indicates

Answer 10

the rate of accumulation is 1 to 3 inches per hour and activation of deicing equipment or diversion is necessary.

Question 11

2779
Ice contamination on the wing surface

Answer 11

must be completely removed before flight.

Question 12

2808
Ice on the wing will increase stall potential

Answer 12

At lower angle of attack.

STALLow Attack

Question 13

2836
Structural icing will most likely form on the

Answer 13

tail.

Question 14

2861
You encounter freezing drizzle at your flight altitude. This is an indication that

Answer 14

warmer air is above you.

Freezing drizzle Wa you

Question 15

2612
While enroute to destination, you receive approach clearance and descend to final approach altitude. After configuring the airplane for landing by extending landing gear and flaps, the nose pitches down. Suspecting ice-contaminated tailplane stall (ICTS) you should

Answer 15

partially or completely retract the flaps and prepare for a no-flap approach and landing.

ICTS No flap Landing

Question 16

2630
If you encounter icing with the autopilot engaged, you should be aware that

Answer 16

it may be best to periodically disengage the autopilot and hand-fly the aircraft

Question 17

2631
Which is true regarding recovery procedures from aerodynamic stalls due to structural icing?

Answer 17

Some measures for recovery from ICTS are opposite of those for recovery from wing stall.

Question 18

2872
Wing stall and roll upset can occur in all phases of flight, however, the approach and landing phase is particularly susceptible to ice contaminated tailplane stall (ICTS). To minimize this risk you should

Answer 18

know the published limitations in the AFM on the maximum flap setting approved in icing conditions due to ICTS susceptibility.

Question 19

2958
While flying with the autopilot engaged, you encounter structural icing. You should be aware that

Answer 19

you may want to consider disengaging the autopilot and hand-flying.

Question 20

3370
The de-icing equipment on some aircraft may be unable to remove

Answer 20

Frost