Ice and Rain Protection Flashcards
How many wing anti ice schedules are there?
Two, low for slats retracted and high for slats extended
In the event of an engine failure, there will be no way to provide air to the respective wing for ice protection
False, use the wing anti-ice cross bleed selector knob to route air from the good engine to both wings.
What is the maximum speed for the operation of the windshield wipers?
250 KIAS
If ice is detected on one of the ice detector probes, the respective ice protection systems will automatically be activated
FALSE
When are the probes automatically heated?
When one engine is started and its generator comes on line
What will be seen on the N2 gauges when the wing anti ice system is activated
The arc will turn white up to 77% to indicate power setting that may be required for adequate ice protection.
What happens if a Cowl Anti Icing duct ruptures?
The escaping pressurized bleed air is contained inside the outer duct
If the pilot selects the HI position of the windshield heat switch, additional heat will be applied to all four aircraft cockpit windows
FALSE. Only the windshields are heated at the higher level.
The FAST position of the window wipers will always override any other position selected
FALSE. The last position selected by either pilot will control both wipers.
whoever moved the switch last will have control of the speed for both wipers
What occurs when the wing anti-icing switch is selected ON?
The modulating SOVs will vary their position based on commands from the dual-channel AILC computer, and will maintain a hotter temperature schedule if the slats are extended
Are the vertical and horizontal stabilizers provided with anti ice protection?
No. it is not required tests have shown no significant ice can form there.
which engine bleed air stage does the anti ice air come from?
the 10th stage
Can the APU bleed provide anti ice protection?
No
how are the windshields protected from ice?
they are electrically heated
which position is the windshield heat normally in?
LOW
are the wings protected from getting too hot? and if so how?
yes the anti ice leak controller (AILC) monitors wing temperature and regulates the anti ice valves to maintain the appropriate temperature
Can one bleed provide air to both wings?
Yes by opening the WING A/I CROSS BLEED selector to the desired side.
When is the ice detector test accomplished?
on the first flight of the day
What do the PROBES switches do in flight?
NOTHING, in flight all probes are fully powered regardless of switch position
When should the WING A/I CROSS BLEED rotary selector be turned?
During a bleed leak condition or an engine failure as directed by the QRH
Which Pilots WIPER switch is controlling?
the last one moved
Define ground and icing conditions
Ground icing: OAT 10 or less with visible moisture
Flight icing: TAT 10 or less until -40 SAT while flying through visible moisture such as clouds, rain, snow, sleet or ice crystals
When should cowl anti ice be turned on while on the ground?
during ground icing conditions or while taxiing on a contaminated surface
When should wing anti ice be turned on while on ground?
Only for takeoff when OAT is 5 or less with visible moisture
What exceptions are made when type II or IV fluid have been applied to wings?
only activate wing anti ice just prior to advancing thrust levers for takeoff
When should cowl anti ice be turned on in flight?
when flight in icing conditions or when ICE message is displayed
When should the wing anti ice be turned on in flight?
When ICE is annunciated by the ice detection system or while flying in icing conditions with an airspeed of less than 230KIAS
