Chapter 30: Aircraft Contamination & Deformation

Question 1

Contamination (4)

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Answer 1

Frost - descent -> cold fuel under wing in moist air
Rime Ice - not likely at > 250 kn
Clear Ice - most dangerous
Rain Ice - warm front inversion

Question 2

Worst Case for Contamination

Jet or Prop plane worst?

Answer 2

Low alt, < 250 kn, humid, T < 5°
Prop susceptible because flies in these conditions
Jet app & dep

Question 3

TEM (7)

Answer 3

Reduce L, T
Increase W, D
Stall, Jammed controls, CG pos change

Question 4

Effect on Lift

How affect Clmax, αs, Vs. High danger with stall (2)

Answer 4

Clmax-, αs-, Vs+
stall warner not reliable
unexpected stall

Question 5

Effect on Drag

Answer 5

Skin drag can double (important in cruise)

Question 6

Tailplane Recovery

Steps (3)

Answer 6

1. Reselect smaller flap setting
2. Pull up as soon as plane unstalls
3. Don’t increase T (AC dependent)

Question 7

Prevention

Departure (3), arrival (4)

Answer 7

Departure: Inspect, Deice, respect fluid holdover time
Arrival: Deice, anti-ice, avoid AP for trim, conf early