De-Icing Procedures Flashcards Preview

SkyWest CRJ Upgrade 2019 > De-Icing Procedures > Flashcards

Flashcards in De-Icing Procedures Deck (21):
1

What is considered icing conditions on the ground?

OAT = 10*C
Contaminated taxiways/runways

2

When can wing frost form?

Cold soaked fuel @ 2295 lbs full

3

What is considered icing conditions in flight?
What temp is icing no longer a threat?

TAT = 10*C
Visible moisture of any kind
SAT >-40*C

4

If the wing is covered in frost that is sandpaper like, how much can lift be reduced by?

30% reduction in lift

5

What can the FZNG precip table be used for?

Go/No Go decisions

6

When is a Cold WX preflight inspection required?

OAT = 5*C
Wing fuel temp = 0*C
conditions conducive to icing
RON exposed to frost/contamination
Residual ice
Cold soak (8hrs or more)

7

Is forced air de-icing allowed? What are the stipulations?

Yes,
Only if there is no active precipitation
If active precip, type 1 fluid must also be used

8

What are the CRJ 200 critical surfaces?

Wing leading edge/ upper/ fwd/ rear surface/ winglets
Vertical stabilizer /lead/rear/ upper/ fwd
Engine inlets

9

What are the CRJ 200 critical areas

Air data probes
AOA vanes
Antennas
Fuel drains/NACA vents
APU intake/exhaust
Land gear
Windshield/wipers

10

If there is light frost on the fuselage, is T/O prohibited?

NO, as long as features are distinguishable t/o approved,

11

How much frost is allowed on the underside of the wing?

1/8 inch

12

What is Type I fluid?

De-ice
Low viscosity
Orange

13

What is Type II Fluid? What is it used for and what are the characteristics?

Anti-ice, remains on surface until takeoff, high viscosity
Colorless, not generally used, 50% glycol

14

Type III? Characteristics and uses

De-ice and removes residual type IV
Longer HOT that type I and II
Can be used as anti-ice
Low viscosity
Yellow color
Can be used on SW a/c if its diluted

15

Type IV? Characteristics and uses

Offers the greatest thermal and shear capabilities of anti-ice
100% concentration
Lowest freezing point of all the fluids
Forms thin, gel-like film
High viscosity
Green color

16

What affects a HOT?

OAT
Precipitation type
Intensity
Wind
Velocity

17

When must the pre-takeoff contamination check be used?

Anytime the a/c has been anti or de-iced
HOT is a guideline
Must make sure fluid hasn’t failed

18

What are the communication elements needed for anti/de-icing procedures?

Element A: type of fluid
Element B: Concentration of fluid
Element C: time of the beginning of final step
Element D: not used
Element E: clear surfaces check

19

What is the difference between a pre-takeoff contamination check and a pre-takeoff check?

PTakeoff contamination is only for the 7/9
P takeoff check is for every aircraft that has been anti/de-iced

20

What is a clean aircraft concept?

No aircraft may takeoff with frost, ice, snow or any adherence to the wing

21

What is the purpose of the pre takeoff check?

To verify that the aircraft’s critical surfaces are clean and clear of contaminations