Anti-Ice & Rain Flashcards
Which areas on the plane are protected with thermal and electrical anti-icing?
Engine anti-ice, wing anti-ice, flt deck window heat, probe and sensor heat and windshield wipers.
Which window does the windshield air control provide adjustments to?
1 window for both CA & FO
What are the windshield wiper positions?
Park, INT, LOW, HIGH
What does placing the engine anti-ice switch on do in addition to opening the valve?
sets stick shaker logic. This involves changing the speed indicator stick shaker and min maneuver speed bars. Wing anti-ice on also adds corrections.
Engine anti-ice valves are controlled_______ and activated by ________ pressure
electrically, bleed air
Valves for WIng Anti-ice are operated by _____ motors.
AC
Wing anti-ice can only be used in the air
False. placing the switch ON causes the valves to open or close depending on the engine thrust setting or duct temp.
Which slats does the wing bleed anti-ice air go to?
three inboard leading edge slats on each wing.
Which slats have no protection for wing icing?
leading edge flap and outermost slat.
T/F: Windows 1 and 2 on both sides have a conductive coating on the outer layer of glass that prevents fogging and ice accumulation.
True.
What happens if a window heat is experienced?
power is automatically removed. An amber OVERHEAT light comes on.
How many minutes before takeoff should the window heat be placed on?
10 minutes. Also, ensure OVERHEAT lights are out.
What does the WINDOW HEAT OVHT TEST switch do?
Simulates an overheat condition. All lights should be on.
What can an OVERHEAT light on the window heat panel also mean?
electrical power to one or more windows is interrupted.
When do window heat ON lights extinguish?
Switch is OFF
an overheat is detected
System failure has occured
System is at correct temp.
Which windows are provided with conditioned air for de-fogging?
1 windows.
T/F: You may operate the windshield wipers on a dry window.
False.
Which probes are heated? Which are not?
Heated: pilot probes, TAT probe and Alpha vanes are electrically heated.
Not heated: static ports.
With respect to probe heating, what happens when on standby power?
No indication of system status
Stby airspeed probe not heated
Captain’s probe only one heated
-no indication of failure.
When will you see the blue COWL VALVE OPEN light?
Only when the valve is in transit. Goes off when it reaches the commanded position.
T/F: You can use engine anti-ice when OAT on ground or TAT in flight is 10C or above.
False.
What is the first thing you do when turning on the engine anti-ice?
1st: Turn both ENGINE START switches to CONT. Then turn on anti-ice switches.
Where will TAI appear when the engine anti-ice switches are on?
On the Upper Display Unit of engine info.
Once engine anti-ice is no longer needed, where do the ENGINE START switches go?
AUTO setting.
What happens when the WING ANTI-ICE switch is moved on?
Valves should open and L and R VALVE OPEN lights should illuminate blue to show the valve is in transit.
What happens to the WING ANTI-ICE switch just after lift off?
it automatically trips OFF.
On the ground, when is Wing Anti-Ice not required
When you’ve used Type II or Type IV de-icing fluid.
What does the amber COWL ANTI-ICE mean?
there is an overpressure downstream of the cowl anti-ice valve. The duct pressure needs to be reduced.
When COWL ANTI-ICE comes on, what do you do?
Take Autothrottles off and then retard the thrust for that engine.
What would indicate that a cowl valve has not moved to the commanded position?
COWL VALVE OPEN light remains illuminated and the TAI indication on the Upper DU is still amber.
If ENG ANTI-ICE on and a blue COWL VALVE OPEN light on, what position is the valve in?
It has failed in the closed position. Avoid icing conditions.
If the ENG ANTI-ICE switch is off and the blue COWL VALVE OPEN light is on, what has happned?
The valve has failed in the open position. If TAT is 10C or above, thrust on the affected engine should be limited to 80% N1 if possible.
If a window heat OVERHEAT light comes on and you have turned off the switch, how long should you wait to bring it back on?
2-5 minutes.
If a window heat switch is off, limit airspeed to _____ knots max below _______ feet due to loss of strength of the window.
250 kts, 10,000 feet.
If a WING ANTI-ICE valve has failed open and the TAT is above 10C or there is no visible moisture, what can you do?
close the wing isolation valve and turn the associated side pack OFF and the engine bleed side off on that side too.
