The selectors must be ON for the engine anti-ice system to operate on the ground, since AUTO does not operate on the ground.
Which windows are provided with backup anti-fog heat?
Windshield Heat is provided by electric resistance coatings.
There are three angle-of-attack (AOA) sensors, mounted aft of and above the pitot probes on each side of the fuselage.
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.
Probe Heat automatically operates when either engine is operating.
The level of heat provided to the pitot probes is automatically set a lower level on the ground to protect from over heating the elements. Full heat level is provided in flight.
The engine anti-ice systems operate through the delivery of bleed air to the inlet cowl. The hot air for engine anti-ice is provided:
The automatic ice detection system consists of:
The detector probes normally vibrate when the detection system is operating. If ice accumulates on a probe, the probe will vibrate at a lower frequency. The probe heater will turn on to melt the ice until the vibration frequency returns to normal. Once a detector probe has ice build-up, it is automatically de-iced.
What do the EAI symbols on EICAS indicate?
The Wing Anti-ice system operates through the delivery of hot air to the three midwing slats.
The hot air for wing anti-ice is provided by the pneumatic system.
Only the forward windows have exterior surface anti-icing. The forward windows have exterior and interior surface anti-fogging protection. The side windows have interior surface anti-fogging protection only.
Advertisement
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.
There are no controls for the operation of Probe Heat.
Indications are provided on the EICAS when one or more probe heaters are not operating.
When can engine anti-ice be operated manually?
What does the WINDOW HEAT R FWD EICAS message mean?
What occurs when engine anti-ice is operating?
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:
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.
When will the ANTI-ICE ON EICAS message be displayed?
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.
The Windshield Wiper for each pilot is controlled by a 3 position rotary switch on the respective side of the forward Overhead Panel.
The windshield wiper for each pilot is controlled by a 4 position rotary switch on the respective side of the forward overhead panel.
Advertisement
The bleed air for Engine Anti-ice comes directly from the associated engine and not from the Pneumatic System ducting.
With Engine Anti-ice On, the display of "EAI" appears ___________ the N1 displays.
Does Wing Anti-ice operate when the aircraft is on the ground?
The Wing Anti-ice system can operate automatically or can be selected ON-OFF manually by the crew.
Window heat - An INOP light illuminates in the respective switch when:
The WINDOW HEAT switches control heating for all flight deck windows. With the switches ON, window heat operates as soon as:
The AOA vanes are heated:
The AOA has only one temperature level.
Which windows are provided with backup anti-fog heat?
A backup anti-fogging system for the flight deck windows operates automatically if there is a primary window heat system failure.
A backup anti-fogging system is available for the forward windows only: it operates automatically if there is a primary window heat system failure.
With the WING ANTI-ICE selectors set to AUTO in flight, the wing anti-icing valves open when icing conditions exist and bleed air pressure is available.
Advertisement