C-40 ANTI-ICE/WINDOW HEAT

  1. Image Upload 1
    What does #1 indicate?
    Illuminated (amber) – overheat condition is detected.

    Note: OVERHEAT lights also illuminate if electrical power to window(s) is interrupted.
  2. Image Upload 2
    What does #2 indicate?
    Illuminated (green) – window heat is being applied to selected window(s).

    Extinguished:

    -Switch is OFF, or

    -An overheat is detected, or

    -A system failure has occurred

    -System is at correct temperature.
  3. Image Upload 3
    What does #4 do?
    Maintenance function/troubleshooting function.

    OVHT – simulates an overheat condition.

    PWR TEST – provides a confidence test/verifies operation if a light is burned out.

    Note: Refer to Supplementary Normal Procedures for Window Heat Test Procedures.
  4. Image Upload 4
    Which windows are heated by the FWD switch?
    Image Upload 5

    L1 and R1
  5. Image Upload 6
    Which windows are heated by the SIDE switch?
    Image Upload 7 


    Aircraft 02-0201 and 02-0202:  2,3,4,5

    Aircraft 02-0203:  Only 2 and 3
  6. Position window heat switches ON at least ___ before takeoff.
    Position window heat switches ON at least 10 minutes before takeoff.

    (FCOM)
  7. Image Upload 8
    What does #2 do?
    PULL – supplies conditioned air to number 1 windows for defogging.
  8. Image Upload 9

    What does #1 indicate?
    Illuminated (amber) – related probe not heated.

    Note: If operating on standby power, probe heat lights do not indicate system status.
  9. Image Upload 10
    What does #3 do?
    Push - Electrical power applied to TEMP PROBE on the ground.
  10. Which probes are heated, and how?
    Pitot probes, the total air temperature probe and the alpha vanes are electrically heated. Static ports are not heated. When operating on standby power, only the captain’s pitot probe is heated, however, the CAPT PITOT light does not illuminate for a failure.

    Note: The pitot probe for standby airspeed is not heated when the airplane is on standby power.
  11. Image Upload 11
    What does #1 indicate?
    Illuminated (amber) – indicates an overpressure condition in duct downstream of engine cowl anti–ice valve.
  12. Image Upload 12
    What does #2 indicate?
    Illuminated (blue) –

    -bright – related cowl anti–ice valve is in transit, or, cowl anti–ice valve position disagrees with related ENGINE ANTI–ICE switch position

    -dim – related cowl anti–ice valve is open (switch ON).

    Extinguished – related cowl anti–ice valve is closed (switch OFF).
  13. Image Upload 13
    What does #3 do?
    ON –

    -related cowl anti–ice valve is open

    -stick shaker logic is set for icing conditions.

    OFF –

    -related cowl anti–ice valve is closed

    -stick shaker logic returns to normal if wing anti–ice has not been used in flight.
  14. What portion of the engine is anti-iced?
    Engine bleed air thermal anti–icing prevents the formation of ice on the engine cowl lip.
  15. How does stick shaker logic work with engine anti-ice?
    Note: Stall warning logic adjusts stick shaker and minimum maneuver speed bars on the airspeed indicator. FMC displayed VREF is not adjusted automatically.


    Note: Stall warning logic, airspeed indications, and minimum maneuver speeds on the airspeed indicator return to normal when engine anti–ice is positioned OFF if wing anti–ice has not been used in flight.
  16. When must engine anti-ice be on in flight?
    Engine TAI must be on when icing conditions exist or are anticipated, except during climb and cruise below -40°C SAT. Engine anti-ice must be on prior to and during descent in all icing conditions, including temperatures below -40°C SAT.  Delaying the use of TAI until ice buildup is visible from the cockpit may result in severe engine damage.
  17. Image Upload 14
    What does #1 indicate?
    Illuminated (blue) –

    -bright – related wing anti–ice control valve is in transit, or, related wing anti–ice control valve position disagrees with WING ANTI–ICE switch position

    -dim – related wing anti–ice control valve is open (switch ON).

    Extinguished – related wing anti–ice control valve is closed (switch OFF).
  18. Image Upload 15
    What does #2 do?
    OFF – wing anti–ice control valves are closed.

    ON (in the air) –

    -wing anti–ice control valves are open

    -stick shaker logic is set for icing conditions.

    Note: Stick shaker logic remains set for icing conditions for the remainder of the flight, regardless of subsequent WING ANTI–ICE switch position.

    ON (on the ground) –

    -wing anti–ice control valves open if thrust on both engines is below takeoff warning setting and temperature inside both distribution ducts is below thermal switch activation temperature

    -control valves close if either engine thrust is above takeoff warning setting or thermal switch is activated in either distribution duct. Switch remains ON

    -switch trips OFF at lift–off.
  19. What portion of the wing is anti-iced by the wing anti-ice system?
    The wing anti–ice system provides protection for the three inboard leading edge slats by using bleed air. The wing anti–ice system does not include the leading edge flaps or the outboard leading edge slats. The wing anti–ice control valves are AC motor–operated. With a valve open, bleed air flows to the three leading edge inboard slats, and is then exhausted overboard. The wing anti–ice system is effective with the slats in any position.
  20. Does wing anti-ice operate on the ground?
    Yes.  On the ground, positioning the WING ANTI–ICE switch ON opens both control valves if thrust on both engines is below the setting for takeoff warning activation and the temperature inside both wing distribution ducts is less than the thermal switch activation temperature.
  21. When will the wing anti-ice switch trip off if it is ON on the ground?
    At lift off
  22. How does stick shaker logic work with wing anti-ice?
    Note: Stall warning logic adjusts stick shaker and minimum maneuver speed bars on airspeed indications. FMC displayed VREF is not adjusted automatically.

    Note: Stall warning logic remains set for icing conditions for the remainder of the flight, regardless of subsequent WING ANTI–ICE switch position.
  23. If wing anti-ice is operated on the ground, what happens with the L/R valve open lights if the valves modulate open and closed?
    Valve position is monitored by the blue VALVE OPEN lights.
  24. When do icing conditions exist?
    Icing conditions exist when TAT is 10°C (50°F) or below and:

    -visible moisture (clouds, fog with visibility less than one mile, rain, snow, sleet, ice crystals, and so on) is present, or

    -standing water, ice, or snow is present on the ramps, taxiways, or runways.
  25. CAUTION: Use of wing anti-ice above approximately ___ may cause bleed trip off and possible loss of cabin pressure.
    CAUTION: Use of wing anti-ice above approximately FL 350 may cause bleed trip off and possible loss of cabin pressure.
Author
CForty
ID
350005
Card Set
C-40 ANTI-ICE/WINDOW HEAT
Description
C-40 ANTI-ICE/WINDOW HEAT
Updated