Ice And Rain Flashcards
Are static ports heated?
No
With window heat selected ON, are the windows continuously heated?
No - they maintain a constant temperature
When must Engine Anti-Ice be selected ON?
Icing conditions
When must Wing Anti-Ice be selected ON?
Ice accumulation on the flight deck window frames, windshield center post, or on the windshield wiper arm may be used as an indication of structural icing conditions and the need to turn on wing anti-ice.
How is engine core anti-ice controlled and are there any flight deck indications?
Core anti-ice operation is automatically controlled by the Electronic Engine Control (EEC) with no crew input or indication of normal operation. The EEC controls the core anti-ice system by directing bleed air to the engine core as needed
based on engine parameters and atmospheric conditions.
When Engine Anti-Ice is selected ON what happens?
- allows engine bleed air to flow through the cowl anti–ice valve for cowl lip anti–icing
- sets stall warning logic for icing conditions.
- sets engine idle speed per the following table:
What would indicate an overpressure in the cowl duct?
The amber COWL ANTI–ICE light illuminates due to excessive pressure in the duct leading from the cowl anti–ice valve to the cowl lip.
What happens when positioning the Wing Anti-Ice to ON?
- opens both control valves
* sets stall warning logic for icing conditions.
After turning the Wing Anti-Ice switch OFF, does the stall warning logic and minimum maneuvering speeds return to normal flight conditions?
No
When will the Wing Anti-Ice valves close automatically?
Both valves close if either engine thrust is above the takeoff warning setting or either temperature sensor senses a duct overtemperature. The valves automatically reopen if thrust on both engines is reduced and both temperature sensors are cool.
What will happen if you take off with the Wing Anti-Ice ON?
The WING ANTI–ICE switch automatically trips OFF at lift–off when the air/ground sensor goes to the air mode.
What would indicate that you were encountering ice crystal icing?
- APPEARANCE of rain on the windshield at temperatures too cold for liquid water to exist. This is due to ice crystals melting on the heated windows (sounds different than rain)
- Areas of light to moderate turbulence.
- Static discharge around the windshield (St. Elmo’s fire).
• Smell of ozone or sulfur.
Where are you most likely to encounter ice crystal icing?
At temperatures below freezing near convective weather,
