Ice&rain Flashcards
What temp is clear ice produced
0 - minus 10
What temp is rime ice produced
-10 and below
Problems with ice
Decreases lift
Increases weight
Increases drag
What is thermal wing anti-icing
Warm air from engines used to anti ice
If ice gets into the engine what happens
Disturbs air flow
What are the two types of ice detection
Optical and rotary
How is optical ice detection operated
Performed manually and used before ice builds up
How may detectors does rotary type have
2
Where is rotary type detectors mounted
Forward fuselage
What does hydrophobic coating do
Increase angle to 100 degrees
When is high contact used
More then 80 degrees , rain repellent fluid
How is ice detected by electronic ice detectors
Decreases frequency of vibrating probe tip
Method used to remove snow and ice
De icing followed by procedures
How are the engine and wing thermal anti ice systems operated
Each engine has its own switch
Left and right wings controlled by same switch
What are the restrictions for windscreen wipers
On only when aircraft is wet
Speed has to be less then 250 knots
How is rotary type ice driven
Single phase ac motor
When do probe heating systems switch on
Automatically when engine is started
How many holes per inch are laser drill into tks weeping wing chemical anti ice panels
800
How long does chemical anti ice system reservoir enable the system to operate for
1-2 hours
How long are pneumatic de - ice boots inflated for
6-8 seconds
The air source for de ice boots is supplied by what
Engine compressor
When should pneumatic de-ice boots be cleaned
During scheduled wash
How is electrical power supplied to propeller de ice boots
Slip rings
How long is power ramped up to prevent thermal shock on electrically heated windscreen
4 mins
Temperature coefficient of window heating system temp sensors
Positive temp coefficient
What’s used to detect ice
Rotor ice detector single ac motor
