Flashcards in De-Icing Procedures Deck (21):
What is considered icing conditions on the ground?
OAT = 10*C
When can wing frost form?
Cold soaked fuel @ 2295 lbs full
What is considered icing conditions in flight?
What temp is icing no longer a threat?
TAT = 10*C
Visible moisture of any kind
If the wing is covered in frost that is sandpaper like, how much can lift be reduced by?
30% reduction in lift
What can the FZNG precip table be used for?
Go/No Go decisions
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
Cold soak (8hrs or more)
Is forced air de-icing allowed? What are the stipulations?
Only if there is no active precipitation
If active precip, type 1 fluid must also be used
What are the CRJ 200 critical surfaces?
Wing leading edge/ upper/ fwd/ rear surface/ winglets
Vertical stabilizer /lead/rear/ upper/ fwd
What are the CRJ 200 critical areas
Air data probes
Fuel drains/NACA vents
If there is light frost on the fuselage, is T/O prohibited?
NO, as long as features are distinguishable t/o approved,
How much frost is allowed on the underside of the wing?
What is Type I fluid?
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
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
Can be used on SW a/c if its diluted
Type IV? Characteristics and uses
Offers the greatest thermal and shear capabilities of anti-ice
Lowest freezing point of all the fluids
Forms thin, gel-like film
What affects a HOT?
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
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
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
What is a clean aircraft concept?
No aircraft may takeoff with frost, ice, snow or any adherence to the wing