Flashcards in Ice And Rain Deck (11)
Which part of the airframe is anti-iced?
- 3 outboard leading edge slats of each wing.
- Engine air intakes
- flight compartment windows.
- pitot heads, static ports, AOA and TAT probes
- Water-waste drain mast.
Can APU be used for airframe anti-icing?
Where is the hot air taken from for:
a) engine anti-icing
b) wing anti-icing
a) An independent air bleed from the high-pressure compressor protects each engine nacelle from ice.
b) Hot air from the pneumatic system.
What happens if there is NO electrical control to the:
a) wing anti-ice valve
b) engine anti-ice valve
a) Wings: If the electrical power supply fails, the valves close.
b) Engine: If the electrical power fails, the valves open.
How long does the WAI ground test last?
What happens after that time?
What happens at lift-off if still on?
- 30 seconds, then the valves close.
- Valves close. Light still illuminates
- Valves re-open once lift-off.
What happens to the EPR/N1 and EPR/N1 limit, when EAI is selected ON?
N1 limit reduces.
Which probes are NOT heated on the ground?
- The TAT probe will never be heated on the ground, regardless of probe heat pb position.
- Pitot heating operates at a low level - the changeover to normal power in flight is automatic)
In the AUTO position, when are PROBES and WINDOWS heated automatically?
- In flight
- On the ground (except TAT probes) provided one engine is running.
What is the maximum speed for the use of windscreen wipers?
Below what temperature can de-icing be switch off?
-40 degrees SAT during climb or cruise.
(Note: In the descent, anti-ice goes on regardless of temperature when in visible moisture.)