Boeing 777 Anti Ice
Boeing 777 Anti Ice 15 Questions at a time (45 Questions Total)
1 / 15
What occurs when engine anti-ice is operating?
2 / 15
Why are the WIPER selectors set to OFF during preflight?
3 / 15
Why are the wipers never operated on a dry windshiled?
4 / 15
When will wing anti-ice operate automatically?
The wing anti-ice system operates automatically only in flight. This means that the system is designed to activate and de-activate itself without any manual intervention when the aircraft is in the air. It does not operate automatically on the ground, indicating that the system needs to be manually controlled during ground operations. The answer also indicates that the system does not depend on the Total Air Temperature (TAT) being above 10 degrees Celsius for automatic operation.
5 / 15
When can engine anti-ice be operated manually?
Engine anti-ice can be operated manually both on the ground and in flight. This means that the system can be activated to prevent ice from forming on the engine during both stationary and moving conditions. The option "On the ground or in flight" indicates that the anti-ice system can be used in either situation, providing flexibility and ensuring the safety and efficiency of the engine operation. The condition of the TAT (Total Air Temperature) being above 10 degrees is not relevant to the operation of the engine anti-ice system.
6 / 15
An additional wing anti-ice inhibit for Automatic Wing Anti-ice operation (independent of the TAT inhibit), is active during the takeoff phase of flight.
Automatic wing anti-ice operation is inhibited for 10 minutes after takeoff. Manual wing anti-ice operation is not affected by this inhibit.
7 / 15
The selectors must be ON for the engine anti-ice system to operate on the ground, since AUTO does not operate on the ground.
8 / 15
The pneumatic system isolation valves automatically open to maintain anti-icing to both wings if:
Whether the system is operating in Manual or Auto, if one wing anti-ice valve fails closed, the wing anti-ice system automatically closes the other valve to prevent asymmetrical wing anti-icing.
9 / 15
If the total air temperature (TAT) is above 10 deg.C, both Manual and Automatic wing anti-ice operation is inhibited for:
The TAT inhibit is removed any time TAT drops below 10 deg.C.
10 / 15
There are three angle-of-attack (AOA) sensors, mounted aft of and above the pitot probes on each side of the fuselage.
11 / 15
A backup anti-fogging system for the forward windows can be operated manually if there is a primary window heat system failure.
A backup anti-fogging system for the forward windows operates automatically if there is a primary window heat system failure.
12 / 15
When a Wing Anti-ice Valve is open, the wing anti-ice (WAI) annunciation is displayed below the EICAS N1 indication.
13 / 15
The Wing Anti-ice system is controlled by the Wing Anti-ice switch. The switch has 3 positions. The bleed air for Wing Anti-ice comes from the Pneumatic System ducting and flows to each wing through:
14 / 15
The Wing Anti-ice system can operate automatically or can be selected ON-OFF manually by the crew.
15 / 15
The AOA vanes are heated:
The AOA has only one temperature level.
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