Winter Ops Flashcards
How do we evaluate the % Surface contamination in :
Canada - RSC
USA - FICON
Others - SNOWTAM
Canada - Sum of all the contam
US - Sum of each third and /3
SNOWTAM - % or 3rds if 3rds use US technique
What contam is not considered contam
Wet
Trace
Frost
snow 1/8” or 3mm
If the Sum of the contam is not >25% what should you do
use WET #’s
Can we take off in WET ICE
(WET ICE, Water over ICE, Water over Compact Snow, Slush over ICE, DRY or WET Snow over ICE
Takeoff Prohibited
If all contam is < 26% what should be used for calculations
Eg FICON 10%+25%+20% = 55%
use the second most restrictive
What do you use if the runway is divided in 1/3
use the 1/3 with the most restrictive contam
Can we land with WET ICE
yes if <25%
What is mandatory if taking off in rain with a cold soaked wing?
Must spray with type II III IV
How much frost is permitted on the underside of the wing between the forward and aft spars.
1/8
Is the upper fuselage considered a critical surface?
What is permitted?
No it’s not
Only a thin layer of frost permitted
How warm can cold soaking occur up to?
14 deg
How do you determine if active frost conditions exist?
Use the “dew point and frost point” tables
How do you request a hotdr?
Transactions
Other
Hot/yyz
When deciding when do we use the QRH DEICE checklist?
Door open - no
Door closed - yes
What conditions cause barrel icing?
-5 to -12 deg
Mod to heavy snow
Can you deice with engines off outside of North America?
No
What is a PCI?
PDI?
Pretakeoff contamination inspection
Pre Departure inspection
What is the order of precedence to get hot times?
Hotdr
AC eHOT app
Ac eHOT app used if ACARS is inop or HOTDS unserviceable
When any HOT time is received what must be done if you want to go beyond the lower limit to the upper limit?
PCI
Can a PCI extend an allowance time?
No
How do we treat changing conditions with relation to hot times?
If improving use old HOTDR
If deteriorating requires new HOTDR
What conditions for take off is prohibited if contaminants combined, cover more than 25% of the required length and 100 ft width of the runway to be used?
Take-off is prohibited if any of the following contaminants combined, cover more than 25% of the required length and 100 ft width of the runway to be used.
Wet Ice
Water over Ice
Water over Compacted Snow
Slush over Ice
Dry Snow or Wet Snow over Ice
How do we treat a runway:
When it has a moisture layer that is NON reflective.
When it is covered with sufficient moisture to cause it to appear reflective.
Reported TRACE contamination
Reported FROST runway condition
When it has a moisture layer that is non reflective is considered to be damp, A damp runwayis considered to be WET
When covered with sufficient moisture to cause it to appear reflective, it is considered WET
Reported TRACE contamination shall be considered as equivalent to WET if the coverage is more than 25% of the area to be used.
Reported FROST runway condition shall be considered as equivalent to WET if the coverage is more than 25% of the area to be used.
(AOM 1 Limitations)
What is the Maximum Amount of Snow, Slush or Standing Water for Take-off
Take-off is not permitted from any runway contaminated as defined above, if that runway is contaminated with:
>4 in (102 mm) of light dry snow,
> 2 in (51 mm) of packed dry snow,
> ½ in. (12.7 mm) of slush, wet snow or standing water.
