Pneumatics - Ice/rain protection Flashcards
Under what meteorlogical conditions is icing possible?
OAT or TAT <10°C, and in visible moisture (or in contact with)
What parts of the aircraft are protected from icing with hot bleed air?
Anything to do with the engine. Engine nacelle, EPR probe, wings, inlet guide vanes, inlet duct, nose cowl leading edge.
What parts of the aircraft are protected from icing with electrical heat?
propellers (phased cycle), probes of any kind (e.g. pitot, TAT), stall warning, cockpit window, water drain masts
What forms of rain protection exist for the windshield?
Wipers with multiple speeds and positions (parked position is stowed away), and rain repellent.
What is an ice detector?
A device which detects ice build up through a change in vibration frequency. Automatically engages anti-ice. If icing persists, light will remain illuminated after 1 minute.
What are the types of anti-ice/de-ice available on the ground, explain.
Type 1, which is low viscosity. It is better for light icing as the aerodynamic effects are minimised. Type 2 (most common), high viscosity, is better for longer periods of time on the ground, but has worse aerodynamic effects.
Why is wing anti-ice not available on the ground?
Because the system will get too hot without enough airflow over it. During takeoff, it also drains a lot of power from the engine (reduced T/O performance).
What system prevents wing anti-ice being operational on the ground?
the air/ground logic system
Is engine anti-icing available on the ground?
Yes
What part of the engine is engine anti-ice typically applied to?
The engine cowl
How does engine anti-ice prevent flameout on the ground?
If the ignition is selected to automatic, arming engine anti-ice will automatically switch ignition on.
While the windshield is heated for impact protection, the side windows are heated for….
anti-fog only (chances of side impact unlikely)
Besides being irritating, why should windshield wipers NOT be used on a dry windshield?
May cause scratching
Why should rain repellant not be applied to dry windscreen?
It will just smear. Nowadays a coating is applied, eliminating the need for repellant.
If you’re an idiot and you put rain repellant on a dry windshield, what is the first way in which you SHOULD NOT try to remove it?
With windscreen wipers…this is what generally causes the smudge.
