Ice & Rain Protection Flashcards
Bleed Air
- Inflatable deicing boots locations
- Inflatable deicing boots
o wings
o horizontal and vertical stabilizers
o engine nacelle inlet lips
Electric (Heated)
6
- Propeller blades (Leading edges)
- Pitot/static probes (Left, right, and standby)
- Angle Of Attack (AOA) (Left and Right)
- Engine intake flanges (Left and Right)
- Windshield panels (Left and Right) and
- Captain’s side window panel
Airframe De-Ice System
- Inflatable, rubber deicing boots are bonded to the leading edges of the: (4)
- Inflatable, rubber deicing boots are bonded to the leading edges of the: o Wings o Horizontal stabilizer o Vertical stabilizer o Engine nacelle inlet lips
- System consists of _ sets of “Deicing boots” and _ “Dual Distributing Valves” (DDVs)
- DDVs are equipped with integrated heater elements that activate automatically whenever SAT is below _°C
- DDVs are activated and deactivated automatically when using the ___ mode or can be controlled manually using the airframe ___ selector (overhead panel)
- System consists of 6 sets of “Deicing boots” and 6 “Dual Distributing Valves” (DDVs)
- DDVs are equipped with integrated heater elements that activate automatically whenever SAT is below 5°C
- DDVs are activated and deactivated automatically when using the FAST/SLOW mode or can be controlled manually using the airframe MANUAL selector (overhead panel)
- De-icing may be controlled either automatically or manually
- An isolator valve connects the left and right sides of the airframe deicing system. The isolator valve remains ___ for normal operations
- In the event of a system pressure leak, the isolator valve can be closed via the ”BOOT AIR” switch when selected to ___
- De-icing may be controlled either automatically or manually
- An isolator valve connects the left and right sides of the airframe deicing system. The isolator valve remains open for normal operations
- In the event of a system pressure leak, the isolator valve can be closed via the ”BOOT AIR” switch when selected to ISO
- De-icing system pressure is regulated to ___
* “DEICE PRESS” Caution light illuminates if one of the following conditions exist: (3)
• De-icing system pressure is regulated to 18 psi (+/-3 psi)
• “DEICE PRESS” Caution light illuminates if one of the following conditions exist:
o Over/Under Pressure (+/-3 psi)
o If boot is commanded to Inflate/Deflate and it does not
o Leak in the system
De-Ice Boots
- “AIRFRAME MODE SELECT” switch (overhead panel)
o SLOW - All 6 boot sets are inflated and deflated ___
Entire cycle takes _ minutes
Timing and sequencing of the boots is controlled by the ___
o FAST - All 6 boot sets are inflated and deflated ___
Entire cycle takes _ minute
- “AIRFRAME MODE SELECT” switch (overhead panel)
o SLOW - All 6 boot sets are inflated and deflated automatically
Entire cycle takes 3 minutes
Timing and sequencing of the boots is controlled by the deicing TMU (time monitor unit)
o FAST - All 6 boot sets are inflated and deflated automatically
Entire cycle takes 1 minute
De-Ice Boots
DDV heater elements are normally activated automatically (as necessary) by the deicing TMU to prevent ___
If the TMU fails, the mode selector must be set to ___ to provide continuous activation of the DDV heater elements (to prevent them from freezing)
o MANUAL – Rotate clockwise through each of the 6 detent positions
Switch should be left in each detent position until the ___
Each set of related boots will remain inflated as long as ___
After all 6 boot sets have been inflated, a minimum dwell time of __ seconds should be observed before inflating the boot sets again
DDV heater elements are normally activated automatically (as necessary) by the deicing TMU to prevent the DDVs from freezing
If the TMU fails, the mode selector must be set to MANUAL to provide continuous activation of the DDV heater elements (to prevent them from freezing)
o MANUAL – Rotate clockwise through each of the 6 detent positions
Switch should be left in each detent position until the corresponding set of deicing boot indicator lights illuminate
Each set of related boots will remain inflated as long as the switch stays at the set position
After all 6 boot sets have been inflated, a minimum dwell time of 24 seconds should be observed before inflating the boot sets again
Propeller Deicing System
• __ Powered
• Leading edges of the propeller blades have ___ heater elements bonded onto the leading edge of each blade
• When propeller heat is selected ON, ___ blades on the ___ propeller are heated simultaneously. Subsequently, ___ propeller blades on the ___ propeller are heated simultaneously
• If the switch is selected ON, the propellers ___ be heated on the ground (WOW)
• Propeller heat operation continues in this alternating fashion until ___
- AC Powered (115vAC)
- Leading edges of the propeller blades have electric heater elements bonded onto the leading edge of each blade
- When propeller heat is selected ON, all 6 blades on the LEFT propeller are heated simultaneously. Subsequently, all 6 propeller blades on the RIGHT propeller are heated simultaneously
- If the switch is selected ON, the propellers will NOT be heated on the ground (WOW)
- Propeller heat operation continues in this alternating fashion until it is selected OFF
Pitot/Static Probe Heat
• 3 Pitot/Static Probes (Heated): ___
• Heater elements are activated manually by selecting the respective ___
o #1 Pitot/Static probe heater is powered by the ___
o #2 Pitot/Static probe heater is powered by the ___
o Standby Pitot/Static probe heater is powered from the ___
Note: #1, # 2 and STBY pitot/static heat is to be selected ON prior to every flight regardless of ambient conditions
• 3 Pitot/Static Probes (Heated): #1, #2 & Standby
• Heater elements are activated manually by selecting the respective PITOT/STATIC switches (overhead panel)
o #1 Pitot/Static probe heater is powered by the “LEFT115vAC Bus” (C phase)
o #2 Pitot/Static probe heater is powered by the “RIGHT 115vAC Bus” (C phase)
o Standby Pitot/Static probe heater is powered from the “RIGHT 28vDC Essential Bus”
Note: #1, # 2 and STBY pitot/static heat is to be selected ON prior to every flight regardless of ambient conditions
Engine Intake Heat and Bypass Doors
• __ Powered
• ___ elements are installed in the intake flanges of each engine
• Oil pressure sensors and temperature sensors in the intake heater system prevent heater operation when ___
• Each engine intake is equipped with a secondary heating element ___
- AC Powered (115vAC)
- Electric heater elements are installed in the intake flanges of each engine
- Oil pressure sensors and temperature sensors in the intake heater system prevent heater operation when the engine is shutdown or when the SAT is above 15°C
- Each engine intake is equipped with a secondary heating element that will automatically activate if the primary element fails
Engine Intake Heat and Bypass Doors
• Intake heaters automatically activate under the following conditions: (4)
• Intake heaters automatically activate under the following conditions:
o Engine intake bypass door is open AND
o Engine is running (oil pressure sensor) AND
o SAT is below approximately 15°C (temperature sensor) AND
o 115vAC power is available
Windshield & Captain’s Side Window Heat
• Left and right windshields and the Captain’s side window are equipped with heaters to provide anti-icing and de-fogging
• Captain’s side window heat is controlled by the ___ toggle switch, also located on the Windshield Control Panel
• Captain’s side window is heated by the ___
• DO NOT select windshield heat “ON” if SAT is greater than __°C (also placarded on the overhead panel)
- Left and right windshields and the Captain’s side window are equipped with heaters to provide anti-icing and de-fogging
- Captain’s side window heat is controlled by the “PLT SIDE WDO/HT” toggle switch, also located on the Windshield Control Panel
- Captain’s side window is heated by the RIGHT 115vAC Bus
- DO NOT select windshield heat “ON” if SAT is greater than 20°C (also placarded on the overhead panel)
Windshield & Captain’s Side Window Heat
• When “WINDSHIELD HEAT” is selected (overhead panel)
o WARM UP – Both windshields are heated with ___ power from the ___
o NORM – Each windshield is heated at ___ power from its respective ___
• When “WINDSHIELD HEAT” is selected (overhead panel)
o WARM UP – Both windshields are heated with one-half the available power from the LEFT 115vAC Bus
o NORM – Each windshield is heated at full power from its respective Left/Right 115vAC Bus
AOA Vane Heat
• ___ Powered
• 2 AOA vanes are automatically heated
o Left AOA vane is powered be the ___ ( _ phase)”
o Right AOA vane is powered be the ___ ( _ phase)”
• No flight deck control for the AOA vane heaters
• AC Powered (115vAC)
• 2 AOA vanes are automatically heated
o Left AOA vane is powered be the “LEFT 115vAC Bus (B phase)”
o Right AOA vane is powered be the “RIGHT 115vAC Bus (B phase)”
• No flight deck control for the AOA vane heaters
