Ice and Rain Protection Flashcards
The aircraft’s electrical system is used to heat (5):
Flight deck windshields, Air Data Smart Probes, TAT probes, water lines, static port
What uses bleed air for ice protection?
Engine cowls, three outboard slats
What part of the engine is heated?
Only the engine cowls are anti-iced.
What control surfaces are heated by the wing anti ice system?
3 outboard slats
Can the APU be used to provide bleed air for the anti-ice system?
No.
What happens if there is a single bleed source failure?
The crossbleed automatically opens and uses opposite bleed for both wings.
When in flight with a single AC source available, the ________ windshield will be heated.
Only the left.
In flight with a single AC source available, the ___________ windshield will be heated if the left fails.
Right.
Sources for aircraft anti-icing are:
Bleed air and electric
Which panels on the wing do not have ice protection?
Inboard slats, flaps and spoilers
What uses electrical power to prevent icing?
ADSPs, TAT probes, windshield, static port, water lines
What is heated at engine start?
ADS probes, TAT probes, water lines and static port
If an engine fails, does the opposite wing receive ice protection?
Yes, the crossbleed valve opens and uses opposite bleed for both wings.
If an engine fails, does the respective engine receive icing protection?
No, the failed engine does not receive heat to the engine cowl.
How long will the engine and wing anti-ice system remain on after icing is no longer detected?
2 or 5 minutes (epic load dependent).
Is the ice protection system automatic?
Yes, under normal conditions.
Can the pilot override the automatic ice protection system?
Yes, by selecting the ICE PROTECTION selector knob to ON.
How many ice detectors does the aircraft have?
2
If any ice accumulation is detected or suspected, and the ice detection system is not activating, what should the pilot do?
Manually activate the system by selecting the ice protection mode selector knob to ON.
How can a pilot tell if the aircraft is picking up ice in flight?
Look at the wipers and around the windshield.
What happens to the engine anti-ice valve with the loss of electrical power?
The engine anti-ice valve is fail-safe open.
Where do we set engine anti-ice for takeoff?
MCDU T/O DATASET menu
For takeoff, anti-ice on the MCDU T/O DATASET is set to OFF, and the mode selector knob is set to AUTO. Will the anti-ice system turn on if icing conditions are encountered on the takeoff roll?
Not until 1700 AFE or 2 minutes after takeoff, whichever comes first.
What does selecting ALL on the T/O DATASET menu provide for the engine, and how long does the protection last if no ice is detected with the ice mode selector knob set to AUTO?
Engine cowl is heated when the engine is running and turns off at 1700 feet AFE or 2 minutes after takeoff, whichever comes first.
What does selecting ALL on the T/O DATASET menu provide for the wings, and how long does the protection last if no ice is detected with the ice mode selector knob set to AUTO?
Three outboard slats are heated at a wheelspeed of 40 knots, and turns off at 1700 feet AFE or 2 minutes after takeoff, whichever comes first.
With the Ice Detection mode selector knob set to AUTO and the T/O DATASET REF A/I set to OFF, the wing and engine anti-ice is inhibited until when?
Until 1700 feet AFE or 2 minutes after takeoff, whichever comes first.
When would the pilot select ALL on the MCDU DATASET REF A/I MENU?
On the ground during taxi and takeoff when SAT is below 10°C or below and icing conditions exist or are anticipated to be encountered below 1700 AFE.
When would the pilot select ENG on the MCDU DATASET REF A/I MENU?
Never.
When would the pilot select OFF on the MCDU DATASET REF A/I MENU?
No icing conditions present.
When are wings heated on the ground?
If the MCDU DATASET REF A/I MENU is set to ALL and the wheelspeed is greater than 40 knots.
With ice detection mode selector knob set to ON, when will the engine anti-ice operate?
Whenever the respective engine is running.
In icing conditions, what is the correct configuration for anti-icing when taxiing after landing?
ICE PROTECTION MODE knob set to ON.
What is the maximum airspeed if the windshield wipers fail unparked?
VMO/MMO
What happens if the windshield wiper is operated on a dry windshield?
a. The windshield wipers will not operate on a dry windshield.
b. Wiper will remain inoperative until the selector is set to OFF then one of the three available speeds.
Is there a test for the anti-ice system?
Yes, but mx performs the test.
When do we use the ice protection test selector knob?
TEST Function is a maintenance procedure.
Passing through 10,000 feet after takeoff, you see the EICAS A-I WIND VLV OPEN; why?
The wing anti-ice system is testing itself.
Icing conditions exist when SAT on the ground or takeoff or TAT in flight is:
10°C or below with:
Visible moisture present in any form OR
When operating on contaminated surfaces.
During taxi put and takeoff, the MCDU T/O DATASET MENU must be set to _______ when SAT is 10°C or below and icing conditions exist or are anticipated to exist below 1700 AFE.
ALL
The maximum speed for windshield wiper operations is?
250 knots.
What compressor stage is bleed air tapped for anti-icing operations?
10th stage
What indication would you get if the ADS probes were frozen on the ground?
Undesired airspeed indication on the ground
EICAS fault messages
How do you clear the ADSPs if they are frozen in the ground?
Run an engine for 10 minutes OR
Turn ON the ADSP heater for 10 minutes
Verify no airspeed indication or EICAS messages remain
