Ice And Rain Protection Flashcards
What happens to engine anti-ice valves in the event of electrical power loss?
They will open automatically.
What is the speed limit for wind screen wipers?
230kt
Which components receive anti-ice protection from bleed air?
The 3 outboard wing slats and leading edge of engine nacelles.
Which components are heated by the aircraft’s electrical system?
-pitot tubes
-static ports
-probes
-waste water drain masts
-flight deck windows
Where does engine anti ice receive its heating? Is engine bleed air required to be on?
From an independent bleed air source from the HP compressor.
No- engine bleed air does not have to be selected on.
What is classified as engine icing conditions?
10 deg C or below with visible moisture.
*visible moisture- clouds, fog with visibility 1 600 m or less, rain, snow, sleet or ice crystals.
*systems may be switched off below SAT -40 C, even in visible moisture.
What happens to engine anti-ice valves during emergency electrical configuration?
Engine anti-ice valves automatically open.
What happens to engine anti-ice valves if there is no air supply to valve?
Valve would automatically close as it is pneumatically activated.
How do wing and engine anti-ice affect engine N1 limit and idle speed?
When either anti-ice is turned on, N1 limit is reduced and idle speed increases.
When is rain repellant authorised?
Moderate to heavy rain conditions.
Inhibited on the ground with the engines shut down.
Pitot, static and probes heating are automatically controlled by 3 PHCs (probe heat computer). Which controls which?
1 controls CAs set.
2 controls FOs set.
3 controls standby set of data sources.
Where is air intake anti-ice supplied from?
Independent bleed from HP compressor.
*engine anti-ice valves auto opens in electrical failure.
Is APU Bleed permitted for wing anti-icing?
No
Why does engine anti-ice pb fault light momentarily come on when pressed?
What other system is affected?
Valve in transit.
Continuous ignition automatically selected on.
How is probe and window heating controlled if switch in AUTO and ON?
Automatically controlled heating in flight or on ground with 1 engine running.
-continuous heating if ON.
Are TAT probes heated on the ground?
No- to avoid inaccurate readings.
Definition of ground icing conditions?
OAT at or below 10 °C where surface snow, standing water or slush may be ingested by the engines, or freeze on engines, nacelles or engine sensor probes.
Operations on ground in heavy rain?
Extract- OVRD
This closes the skin air inlets, preventing rainwater from entering the avionics bay.
Aircraft should not remain powered more than:
‐ OAT ≤ 39 °C (102 °F): no limit
After takeoff: Extract- AUTO
Engine operations on ground in icing conditions?
In icing conditions, and with OAT at +3 °C or below ice accretion may affect engine fan blades etc- ice shedding procedure required.
