Ice and Rain Flashcards
What anti-ice systems are there?
- Wing Anti Icing
- Engine Anti-icing
- Window heating
- Probe hearing
- Waste and water drain mast heating
What is the hot pneumatic bleed air used to protect from icing?
- Engine nacelles
- Leading edge slats
What does the electrical heating system protect from ice?
- Flight deck window
- Probes / Ports (AOA, Static, pitot, TAT)
- Waste/water masts
Wing Anti Icing - which slats are protected by pneumatic air and which slats are protected by heated leading edge?
- Slats 3,4,5 (outboard) - pneumatic air
- Slats 1 and 2 (inboard) - heated leading edge
Miscellaneous
In flight - when selected on - N1 limit reduced
On- ground - when selected on - does a test of the valves for 30 seconds
Engine Anti Ice. Source of bleed air for engine nacelle?
Independent bleed air from the high pressure compressor of the engine
What do the ENG ANTI ICE pb’s do?
- Opens the anti ice valve in the engine
- This allows hot compressed air into engine nacelle
- Continuous ignition is automatically selected on
- N1 limit automatically reduced
Window Anti Ice. Key points:
- Electrical heating for:
a) windshield anti-icing
b) side window defogging - Controlled by 2 x Window Heat Computers (WHC)
- Normally in AUTO which commands:
a) Window heat ON (in flight or on ground with one engine running
Probe Heat key points:
- Controlled via Probe Heat Computers
- PHCs auto monitor and control heaters to protect probes
2B. In auto mode (on in flight / on while on ground will be heated with one engine running)
- TAT probes are not heated on the ground
When are the ENG 1 and ENF 2 ANTI ICE pbs turned on?
- Taxi on ground with surface snow, standing water or slush that might be ingested into the engines
- OAT at or below 10 degrees and visible moisture present
- In flight - no need for anti ice when SAT is minus 40 degrees or below (save for descent when it should be on)
When is wing anti ice selected on?
Where ice accretion observed on wings, ice detector probe (middle windshield) or fuselage
