Anti-Ice Flashcards
What is the definition of icing conditions:
On the ground and for takeoff temperature below 10 degrees C
In flight below 10 degrees C TAT
Visible moisture in any form (cloud, fog w/ visibility <1 mile, snow, sleet ice crystals)
OAT on the ground and for takeoff is 10 degrees C or below and snow ice standing water or slush that may be ingested by the engines or freeze
on the engines nacelles or engine sensor probes is present on ramps taxiways or runways
How do we know we’re in Ice crystal icing conditions?
TAT around 0 degrees C
Auto throttles struggling
Super cooled water droplets hitting windscreen
Wx Radar returns Red
Where is nacelle anti taken from?
Engine air system right after the PRV
Where is wing anti ice taken from?
Pneumatic bleed ducts
What’s the lower limit of the Engine Anti Ice on? When doesn’t this apply?
-40 SAT
Ice Crystal Icing
Thrust levers back for decent or thrust reduction in icing conditions
What else happens with the selection of nacelle anti ice?
Approach Idle
Wing Anti Ice is turned on, both valves operate normally. What part of the wing is provided anti ice protection?
3 Outboard LE slats
Because boeing determined that was all that was required
With Wing Anti Ice ON, can we extend the slats and continue anti icing?
Yes
What is the difference between the L1/R1 windows and the L2-3/R2-3 windows?
L1/R1 are anti fog and anti ice
Side windows are anti fog only
When will we see the window heat INOP light?
Fault
Jettison L/R2-3 windows loadshed
Switch off
When is window heat powered?
When AC power is connected
When is the TAT probe heated?
Nose gear logic
With the start of the first engine what happens to the probe lights?
Extinguished
In flight going to ANC cold night, freezing drizzle on, all anti ice on, after landing what is the indications of the anti system?
Wing anti ice inhibited - valve lights on because boeing has closed the valves
Nacelle Anti Ice ON
In order for air to reach the anti ice system, what valve must be open?
PRV
