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32 Cards in this Set
- Front
- Back
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What are the different anti-icing modes and what do they do?
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AUTO- when ice is detected will turn on lip, wing and tail anti-icing. (wing and tail require minimum 25k speed to activate)
ENG- lip bleed will be on. Wing and tail will turn on when probes detect ice and speed at/above 25k. ALL- Engine lip on, wing and tail on at or above 25k. |
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How are wing and tail anti-ice systems monitored?
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They are monitored for overpressure, underpressure (both by wing root) and differential pressure (mid wing) through the piccolo tubes
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What happens to anti-icing in the event of electrical failure?
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Engine Lip- Open
Wing and Tail anti-icing closed |
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When are the ice detection probes heated?
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Engine start |
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Where does the lip, wing and tail get their bleed air from?
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Engine lip- On side engine ( only source of air that hasn’t gone through the precooler
Left wing and Tail – Engine 1 Right wing – Engine 2 |
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How does bleed air leave the leading edge of the wings and horizontal stabilizer?
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1. The leading edge vents the bleed air from underside vents and through the rear of the vortalons
2. The horizontal stabilizer vents the bleed air through their wingtips to melt any ice accumulating on the elevator |
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How do the ice detectors work?
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Probes detect ice from changes in vibration (.5mm of ice or more)
Probes turn on anti-icing valves Probes will turn off anti-icing if they haven’t detected ice for 1 minute |
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When will pack 1 be shutoff for the anti-icing system?
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Below 24,600ft pack 1 will shut off to give more bleed to the anti-icing system
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Can the APU bleed be used for anti-icing?
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No
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When must the potable water be dumped?
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When the temperature is 2 degrees or less at the time of parking
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How do you know how light or heavy snowfall is for holdover times?
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Use table 5 snowfall intensities chart to determine the strength of the precipitation , then you go to the holdover times table for the specific fluid
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What areas should be free from Type II and IV fluids?
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Nose cone, windows, avoid engines, tail cone
(WOP 3.6.1 Type II and IV should only be on critical surfaces wings and tail, and the movable surfaces therein) |
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What are the different types of icing fluids?
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Type I – pink/orange 50/50 mix Type Ii – Amber 100% mix Anti-icing only Type III – Pale Straw 100% mix Type IV- Green 100% mix Anti-icing only |
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When does holdover time start and end?
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Starts upon first application to wing
Ends when holdover time in chart has been exceeded OR When fluid looks dull, crystallized, milky opaque, or has snow resting on it |
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Can a holdover time change?
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Yes if conditions change (WOP 2.11.3) |
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What type of icing conditions are not authorized for flight?
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Severe Icing Moderate to severe freezing rain Hail Heavy Ice pellets (takeoff) |
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What is the restriction for ON and OFF gate deicing?
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On gate: Engines and APU OFF, ( APU can be on if there is no external power) Off Gate: Engines ON, APU OFF ( APU may be on if airport doesn’t allow engines on ) |
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When must a tactile check be done?
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5C or less and:
Visible moisture Water on wing Dewpoint spread 3 degrees or less WX conducive for frost Before the second step of the two step de-ice process |
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Who can do a tactile check?
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Pilot for Step 1
Anti-icing Team Step 2 |
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What is a Pre Takeoff check?
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Is done after TYPE IV application JUST prior takeoff AND within holdover time
-Wingtip is check is allowable because the wingtip is comparable to the rest of the plane |
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What is a Pre takeoff contamination check?
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A check done by Anti-ice team AFTER holdover time has expired. After check is complete MUST takeoff within 5 minutes or get another TYPE IV application
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Aircraft contamination notes
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-No contamination allowed prior takeoff -1/8th inch of frost allowed under wing due to fuel tank cooling -Deice required when any contamination is ADHERING to the aircraft -If there is snow resting on anti-ice fluid cannot takeoff |
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What is the difference between normal icing and ground icing?
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Normal icing- ice on plane but icing conditions do not exist to accumulate more Examples: frost from parking overnight or landed with residual ice on the plane Ground Icing - temperature 10°C or below and visible moisture in any form is present (such as clouds, fog with visibility of one mile or less, rain, snow, sleet, and ice crystals) |
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When is an icing takeoff required?
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When the temperature is 10 C or less and:
1. Ceiling is 1500ft or less 2. Visible moisture is present 3. Visibility 1 mile or less 4. Runway has snow, slush standing water |
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When is a cold weather pre-flight required? What is different?
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Anytime temperature is 10C or below
Pay special attention to the gaps between moveable and non-moveable flight surfaces (the leading edge of the flaps tends to pick up ice when landing) Trim full down if the next day will be 10C or below |
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When is cold weather starting required?
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When OAT is 5C or less AND engine has been off for 90 minutes or more
Igniters ON prior start |
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What two types of windshields do we have?
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Sierracin –green tinted plexiglass
-vertical heating elements -glass outer layer PPG – double glass layered -horizontal heating element |
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What are the different windshield temperature sensors?
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Temperature control
Overheat control Spare sensor |
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When are we required to use windshield heat on the ground?
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Foggy windows Icing conditions on the ground |
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What does ICE/SPS SPEEDS on the EICAS mean?
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Stall speeds in flaps 9 -22 are increased
This occurs when ice is detected in flight Inhibited for 5 minutes after takeoff and resets after stall test on ground ( inhibited so that if there is an engine failure you won’t have stall bars directly over the flight director) |
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Ice Test notes
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Ice detection test knob- never hold more than 15 seconds, possibility of warping the leading edge Never reset/alt after an ice test this has the potential to shut down the engine |
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If we get De-iced using Type 1 in a one step process, are we allowed to use the Type 1 holdover chart for anti-icing?
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No, anti icing fluid requires the plane to be clean first for the holdover times to be accurate.
If you wanted to use Type 1 fluid for de-ice, it would have to be with an application of type 1 fluid AFTER the plane was de-iced |
