Flashcards in Ice Protection/Detection Deck (25):
What sources are used for aircraft anti-icing and de-icing?
-Bleed air heat
What uses bleed air for ice protection
-3 Outboard slats
What uses electric heat for ice protection?
Pressurization static port
If an engine fails, does the opposite wing and engine receive ice protection?
-Yes, the crossbleed valve opens to provide symmetrical ice protection for both wings
-The failed engine does not receive heat to the engine lip
How many ice detectors must be working to have ice detection?
One. There are 2 for redundancy
How long will the De-icing system remain on after icing is no longer detected?
If "ICING" on the MCDU is set to 'OFF' and T/O roll icing conditions are encountered, will the de-icing system turn on?
Not until 1700' or 2 minutes after takeoff (whichever happens first)
Can the APU be used to provide bleed air for de-icing?
What is protected from ice & rain?
-Wing leading edge
-Water & waste drain systems
Is the Ice protection system automatic?
Yes, under normal conditions
Can the pilot override the automatic system?
How is Ice detected in flight?
-2 Ice detectors
-Vibrating sensor element that changes frequency when ice builds up around it
-Once Ice is detected, the sensor element heats, the ice melts, the normal vibrating characteristics are restored, and the heating process stops. The cycle repeats as ice rebuilds on the probes
What compressor stage is bleed air tapped for anti-icing operations?
10th high stage valve (HSV)
How is bleed air directed for pneumatic anti-ice?
-Engines - Independent
-Wings - Onside Bleed
What happens if there is a single source failure?
The X-bleed automatically opens
How should the MCDU be set if there are icing conditions present on the ground?
What does selecting 'ALL' on the MCDU provide?
Engine anti-ice - ON when engines are running
Wing anti-ice - ON at 40kts wheel speed
If 'ALL' is selected on the ground, at what point will the Anti-Ice system be automatic?
1700' AGL or 5 minutes after takeoff (whichever happens first)
If 'OFF' is selected on the ground, at what point will the Anti-Ice system be automatic?
1700' AGL or 2 minutes after takeoff (whichever happens first)
How does the failure of one of the two power sources affect the windshield heating system?
On Ground - Inhibited
In Flight - Left side is heated (right heats if left has failed)
What does the 'TIMER' selection on the windshield wiper switch do?
Activates the associated wiper in 8-second intervals
What happens if the wiper is operated on a dry windshield?
-The wiper will stop
-To reset wiper move switch to 'OFF'
When do the smart probes heat?
When an engine is running
Is there a test for the anti-ice system?
Yes, but MX performs this test