Chapter 3 Anti ice, Rain Flashcards
What can happen if wing anti ice (WAI) is used above FL350?
Cabin pressure can be lost as well as ‘BLEED TRIP’ OFF. (FCOM SP.16.11)
When is CSFF (cold soaked fuel frost) allowable?
If all of the following conditions ARE met:
• Ambient air temperature is at or above +4°C+39°F
• There is no precipitation or visible moisture (rain, snow, drizzle, or fog with less than 1 mile visibility)
• Tank fuel temperature is at or above -16°C, +3°F
• All leading edge devices, all control surfaces, tab surfaces, winglet surfaces, and control surface balance panel cavities must be free of snow, ice and frost.
If all of the above conditions ARE NOT met, takeoff with light coatings of frost, up to 3 mm thick, on lower wing surfaces due to cold fuel is allowable; however, all leading edge devices, all control surfaces, tab surfaces, winglet surfaces and control surface balance panel cavities must be free of snow, ice and frost. If the frost on the lower surface is greater than 3 mm thick, all snow, ice and frost on the wings must be removed using appropriate deicing/anti-icing procedures.
What must the F/O check when switching on Probe heat switches?
… that all probe heat lights are extinguished.
Can the WAI be used for de-icing?
Yes
Should the engine anti ice be used for de-icing or anti icing?
Anti
What happens to your IAS buffets when WAI or EAI is turned on?
SMYDS sets stall warning logic for icing conditions.
If only EAI was used, the logic disappears when EAI is turned off.
Stick shaker logic remains set for icing conditions for the remainder of the flight if WAI is used, regardless of subsequent WING ANTI–ICE switch position.
(FCOM 3.10.7)
What indication can be used to indicate icing conditions?
Ice accumulation on the flight deck window frames, windshield center post, or on the windshield wiper arm
When PROBE HEAT switches are placed to auto, when is the Probe system heated?
Power is automatically supplied to both A and B probe heat systems when either engine is running.
Does the ‘Engine Bleed’ valve switch have to be ON for Engine anti ice to work?
No.
What causes the amber COWL ANTI–ICE light to illuminate?
Exceeded pressure ONLY (>65 psi) NG’s only.
On CL, OVER TEMP WILL ALSO TRIGGER
With WAI ON, when will the valves automatically close?
If either engine thrust is above the takeoff warning setting or either temperature sensor senses a duct overtemperature.
Does duct temperature and thrust setting logic work in flight in controlling WAI valve operation?
No
How long before take off must window heat be turned ON?
10 min
Are windows R3&L3 heated?
No
Are the static ports heated on the NG?
No (FCOM 3.20.4)
Which five systems priovide anti ice and rain protection?
- Flight Deck Window Heat
- Windshield Wipers
- Probe and Sensor Heat
- Engine Anti-Ice System
- Wing Anti-Ice System
(FCOM 3.20.1)
What do the amber ‘OVERHEAT’ Lights on the overhead panel (windows) indicate?
Overheat condition is detected or if electrical power to window(s) is
interrupted. (FCOM 3.10.1)
During preflight, you notice onr of the Window Heat ‘ON’ ( or AMBER ‘OFF’ lights illuminate (AN2)), Light extinguish (INU). Whats the most likely reason?
The system (window) is at the correct temperature. (FCOM 3.10.2)
On the Window heat panel, what will pressing the OVHT button do? What is the correct procedure?
OVHT � simulates an overheat condition. (FCOM 3.10.2)
1. Turn the window heat switches on
2. Press the OVHT button
3. The ‘ON’ light should extinguish
(FCOM SP.3.4)
On the Window heat panel, what will pressing the PWR TEST button do? What is the correct procedure?
Provides a confidence test. (FCOM 3.10.2) by verifying operation of the window heat system.
Note: The test may be accomplished when any of the window heat ON lights are extinguished and the associated WINDOW HEAT switch is ON. Do not perform the power test when all ‘ON lights are olliminated (OFF lights are extinguished on AN2).
What should be done If any of the ‘ON’ lights on the window heat panel remains extinguished in flight?
The window heat system is inoperative. Observe the maximum airspeed limit of 250 kts below 10,000 feet.
Can you perform the power test when all ON lights are
illuminated (OFF lights are extinguished on AN2)?
When is the PWR TEST normally completed?
No (FCOM SP.3.4)
When any of the window heat ON lights are extinguished
and the associated WINDOW HEAT switch is ON. This is normally in flight as engineers should attend on the ground if the window heat isnt receiving power. (SP.3.4)
What does the TAT TEST Switch do?
Electrical power is applied to TEMP PROBE on the ground. (FCOM 3.10.4)
What does it mean if a Probe Heat Light Illuminates amber?
Related probe is NOT heated. (FCOM 3.10.4)
Note: If operating on standby power, probe heat lights do not indicate system
status.
