Icing Questions Flashcards
(21 cards)
What are the take-off limitations for ice & snow on the lower wing?
A light coating of frost up to 3mm (1/8”) on the underside of the wing fuel tank area
The holdover tables reveal a timing range for different contaminants. What are the shorter and longer time appropriate for?
The shorter HOT is for ‘moderate’ precipitation.
The longer HOT is for ‘light’ precipitation.
The shorter holdover time has been exceeded, but not the longer HOT, and precipitation is present. What action is required?
A Pre-take off Contamination Inspection.
This is a visual inspection from the cabin of the effectiveness of the anti icing fluid on critical surfaces within 5 minutes prior to the take off roll.
If frozen deposits start to form or accumulate in treated critical aircraft surfaces, a further de ice and application of anti icing fluid is required.
The longer HOT has been exceeded and precipitation is present. What action is required？
A Pre-take off Contamination Inspection and Pre-take off Contamination Check are required within 5 minutes prior to the take off roll.
If the pre-take off contamination check proves to be impractical, return for de-icing/anti-icing. If frozen deposits start to form or accumulate on treated critical aircraft surfaces, a further de ice and application of anti icing fluid is required.
Are snow, ice, or frost permitted on the fuselage?
Only thin hoarfrost is permitted on the upper surface of the fuselage provided all vents and ports are clear of frost.
On a METAR or forecast how are the three intensity levels of snow depicted?
SN indicates moderate snow.
+ heavy
- light
What holdover time is available for +SN conditions exist or are forecast for take-off?
As directed by the “CAUTION” on each chart in OPS Manual Part A: no holdover time guidelines exist for Heavy Snow, regardless of temperature or type of anti-icing fluid being applied (or for snow pellets, ice pellets, moderate and heavy freezing rain, or hail).
Where would you find the decodes for Japan Domestic SNOWTAM?
Operations Manual Part A
After an overnight in freezing conditions what unusual effects may be noticed during taxi and take-off?
The tyres may retain flat spots and, with a short taxi distance, may not warm up sufficiently. Moderate nose wheel and airframe vibration may occur on take-off
What precautions should be taken during taxi out or after landing through slush or standing water?
Taxi out with the flaps UP. Due to cold soak at altitude, aircraft temperatures may be lower than OAT. Do not retract the flaps after landing until a visual inspection has been accomplished. Consider informing ATC for it may be misinterpreted as a hijack.
After landing and taxi, in dry snow conditions with an OAT of -20degrees Celsius, is it necessary to use EAI?
EAI must be used during all ground and flight operations when icing conditions exist or are anticipated.
After a cold weather start with OAT of -20deg C, a generator fault light has illuminated. What may be the cause?
Cold oil in the CSD and the generator may be slow to produce steady power. Usually, 1 minute is enough to return to normal operation but up to 5 minutes may be required.
Having decided to leave the flaps up during taxi out for slush and/or standing water conditions, what would you do differently with regard to checklist management?
Wait for the flaps to reach the TAKE OFF configuration before calling for the BEFORE TAKE OFF CHECKLIST
Jet A fuel freeze point is -40degC.
What is the restrictive fuel freeze point?
-37 deg C
What would you do when the fuel temperature approaches the restrictive fuel freeze point?
Decrease altitude
Increase Mach number
Divert to warmer air (in the poles this may be higher)
When does HOT begin?
HOT timing begins with the commencement of the final application of anti ice fluid.
Note. This also applies to de icing fluid, which may have a quoted anti icing holdover time (though much shorter than anti icing fluids),.
You have 4mm standing water covering over 25% of the runway, can you use TO1-50 derate assumed temperature?
No. It is not recommended due contaminated runway. However a fixed derate can be used, BUT not in conjunction with an assumed temperature.
Tower reports standing water depth is 14mm. Can you go?
13mm is the limit. Take off is not recommended.
What is the primary method of using WAI during flight?
Leave in auto.
Used as a de-over not an anti ice.
Allow ice to accumulate before activates and do not use on ground.
What precautions should be taken while the engines are running during de-ice?
Ensure bleed air is off. Consult fcom3 SPs
What are the take-off limitations for ice & snow in the leading edges, control surfaces, and upper wing?
Free of ice and snow
