Ice & Rain Protection Flashcards
True or False: De-icing systems are used to get rid of ice that has already formed.
True
True or False: De-icing systems are used to prevent ice from forming.
False
though de-ice can be used pre-emptively
True or False: Anti-icing systems are used to prevent ice from forming.
True
True or False: Anti-icing systems are used to get rid of ice that has already formed.
False
How many electronic ice detection probes are installed on the aircraft?
2 Piezoelectric probes.
Where are the electronic ice detection probes located on the aircraft?
Left and Right side foreward fuselage.
How much ice needs to be detected before an indication is displayed on the ED?
Either probe at any detection will display on the ED.
.5mm of clear ice
True or False: When the ice detection probes detect ice, they heat to melt the ice off.
True
When will the ICE DETECT FAIL caution light illuminate?
When both ice detector probes fail.
Failure of the one probe provides no indication, as the system is redundant.
True or False: If one ice detection probe is not working, no alert is provided.
True
What inflates the de-icing boots?
Engine Bleed Air from each engine.
Which aircraft structures do not have deicing boots that use bleed air?
…
True or False: Boot inflation is regulated by a single distributor valve.
False, t
There are 6 individual de-icing boots and 6 Dual Distributing valves.
In order for the TMU to send signals automatically, the airframe mode select switch must not be selected to which position?
Manual
How long does each de-ice boot inflate?
6 Seconds
True or False: If a malfunction occurs in the automatic timer or a leak occurs, the boots can be cycled manually.
True
When should pilots move to the next boot position when using the deicing boots in manual mode?
Once the light illuminates
True or False: The DDVs and check valves have integral heaters which are automatically activated.
True
What is the normal position for the airframe mode select switch?
Manual
True or False: If the TMU temperature monitoring detector fails, the valve heaters default to a permanent ON position to ensure they remain heated.
True
When a pneumatic line ruptures on either side of the aircraft, the de-ice system should be set to _____.
ISO
True or False: All the boots on the horizontal and vertical stabilizers are pneumatically cross-connected.
True
When will the Deice Press caution light illuminate?
When the pneumatic pressure available to either side is less than 15 PSI, Boot pressure does not reach 15 PSI after HDOV opens, Boot pressure stays at 15 PSI after the DOV closes
How are the propeller deice systems powered?
Related 115 VAC bus
True or False: The heater cycle for each propeller is controlled by a timer monitor control unit..
True
True or False: The TMCU adjusts prop heat cycle times depending on the total air moisture.
.
False
The Total Air Temperature must be equal to or lower than _____ for the propeller heaters to operate..
5°C
True or False: The propellers alternate being heated to reduce electrical load.
True
True or False: Both propellers are heated at the same time.
False
What do the prop indicator lights on the Ice Protection panel indicate when illuminated?
That the respective propeller blades are being energized
The TMCU can only begin a propeller heating cycle if Np is above _____.
400 RPM
Which statement is true regarding prop heat duration as it relates to temperature?
…
Once pilots have performed a propeller heat test, how long must they wait until the next propeller test can be performed?
30 Seconds
When is the engine intake heat energized?
- When the intake bypass doors are opened
- Eng is running
- SAT <15 C
- 115 VAC available
What air temperature causes the engine heater to energize?
At or below 15°C
How are the static ports heated?
Electrically #1 and #2 AC Busses, Standby DC
How are the pitot tubes heated?
Electrically #1 and #2 AC, Standby DC
How many volts are needed to power the #1 and #2 probe heaters?
115 VAC
When set to Normal, the windshield is being heated at _____.
Full Power
How many wiper blades are installed on the aircraft?
2
Anti-ice equipment is primarily powered by what source?
115 VAC
True or False: Boot inflation time is the same in both fast and slow modes.
True
True or False: All propeller blades on both engines are heated at the same time.
False
Which of the following statements best describes AOA vane heat?
Automatic
Which window in the flight deck is not heated?
Co-pilots side window
What are the anti-icing system components and how are they heated?
- Leading edges of the propeller blades
- Left, right, and standby pitot/static probes
- Left and right Angle Of Attack (AOA) vanes
- Left and right engine intake flanges
- Left and right windshield panels and Captain’s side window panel
What provides rain protection?
Electrically operated windshield wipers and a hydrophobic coating provide rain removal for the windshields..
When does the Ice Detection System (IDS) turn on?
Automatically activates when the 115v AC power is supplied to the aircraft.
De-icing system pressure for the boots is regulated to ____ psi.
18 PSI
What separates the left and right side of the air-frame de-icing system?
Isolator Valve
