Perform Aircraft Deice/Anti-ice Procedures Flashcards
Where can information be found on deicing procedures? Where can you find the GDPM?
Ground Deice Procedures Manual (GDPM)/EFB>General
When is a cold weather preflight inspection required?
- OAT ≤ 5 ̊C
- Atmospheric conditions conducive to icing exist, or
- The aircraft has RON and may have been subject to contamination, or
- A through flight and residual ice from the inbound leg may have accumulated, or
- The wing fuel temperature is ≤ 0 ̊C
How do you complete a cold weather preflight inspection?
Visually inspect the critical surfaces and components for frozen contaminants. Inspect the wing area by running hand along the leading edge and upper surface to detect surface features. It must be assumed the surface is contaminated if any surface features cannot be visually distinguished or felt that would otherwise be apparent under non- icing conditions.
i. Critical Surfaces
1. Wing leading edge, forward and rear upper surfaces, associated flight
controls
2. Horizontal Stab leading edge, forward and rear upper surfaces,
associated flight controls
3. Vertical Stab and associated flight controls
4. Engine Inlets
5. ADC probes/sensors, AOA vanes, Antennas, Fuel drains and NACA
scoops, APU intake/exhaust, Landing Gear, Flight deck windshield and
windows
Are we allowed to have ice under the wings? How much?
Yes, takeoff is permitted with frost adhering to the underside of the wing fuel tank area that is caused by cold soaked fuel: max 1/8”
What are the four elements required to be transmitted to the PIC when being deiced?
– Specific type of fluid used
– Report the name and concentration by volume
– Specify the time of the beginning of the final deicing/anti-icing step
– Specify that post deicing and/or anti-icing check for clean surface is complete
What’s the HOT for Type I, Light Snow, -8°C?
0:05-0:10
When does the fuselage need to be deiced? Does the HOT apply to the fuselage?
- The upper fuselage must be deiced to remove contamination, other than allowable frost (still possible to distinguish surface features), anytime the wing and tail surfaces require deicing.
- Fuselage must be anti-iced in Canada
What is a pretakeoff check and when and how is it performed?
- A pretakeoff check is performed prior to taking the active runway for departure. It must be performed anytime the aircraft has been deiced/anti-iced, and a HOT has been established, to ensure critical surfaces remain free of frozen contaminants. It is performed within the HOT, as close as practical to takeoff.
- Visually inspect the representative surfaces for evidence of frozen contamination. If representative surfaces are free of frozen contaminants and takeoff will occur within the HOT, the aircraft may takeoff.
What is a pretakeoff contamination check and when and how is it performed?
- Performed when freezing/frozen precipitation has been present since completion of the Post Deicing/Anti-icing Check and the HOT has been exceeded, the HOT is no longer valid due to changing weather conditions, or operations in +SN are being conducted.
- Takeoff must occur within 5 minutes of the check. Crewmember enters cabin and conducts a visual inspection of both wing’s upper surfaces for evidence of contamination and fluid failure.
- Does not apply to CRJ200
How do I know when my deice fluid has failed?
Failed fluid usually loses all its glossiness and resembles a dulled, crystalline appearance. The ability to discern structural detail through the fluid is lost.
Where is the snowfall intensity table found and when do I use it?
Snowfall Intensities as a Function of Prevailing Visibility, found in the back of the GDPM or De-Ice Flip Cards. Used when establishing a HOT.
