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B737 > Anti-Ice/Rain > Flashcards

Anti-Ice/Rain Flashcards

1
Q

what methods are there for ice + rain protection

A
  • thermal anti-icing
  • electrical anti-icing
  • windshield wipers
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2
Q

what anti-icing + rain protections are there

A
  • flight deck window heating
  • windshield wipers
  • probe and sensor heat
  • engine anti-ice
  • wing anti-ice
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3
Q

window and anti-icing structure (up to 899)

A

window structure:
- 1+2 = 2 glass panes laminated either side of vinyl core
- 3 = 2 acrylic panes separated by air
anti-icing structure:
- 1+2 = conductive coating outer ply for electrical heating prevent ice build up and defogging
- 3 = not electrically heated

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4
Q

window and anti-icing structure (900 and beyond)

A

window structure:
- 1 to 3 = 2 glass panes laminated either side of vinyl core
anti-icing structure:
- 1 to 2 = conductive coating on outer ply for electrical heating to prevent ice build up and defogging
- 3 = conductive coating on inner ply for electrical heating to prevent defogging

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5
Q

flight deck window heat operation (up to 899)

A
  • FWD WINDOW HEAT = heating for window 1
  • SIDE WINDOW HEAT = heating for window 2
  • temperature controllers maintain windows 1 + 2 at the correct temperature to ensure maximum strnegth of the windows in the event of bird impact
  • heat is automatically removed in case of window overheat
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6
Q

flight deck window heat operation (900 and beyond)

A
  • FWD WINDOW HEAT = heating for window 1
  • SIDE WINDOW HEAT = heating for window 2 + 3
  • temperature controllers maintain windows 1 + 2 at the correct temperature to ensure maximum strength of the windows in the event of bird impact
  • heat is automatically removed in case of window overheat
  • thermal switches for window 3 maintain the temperature correctly
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7
Q

what are the rain removal methods for the forward windshields

A
  • windshield wipers
  • permanent rain repellant coating on the windows
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8
Q

which probes and sensors are electrically heated

A
  • pitot
  • alpha
  • TAT
    (static ports are not heated)
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9
Q

on standby power which is probe is still heated

A

CAPT PITOT (however, the CAPT PITOT light does not illuminate for a failure)

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10
Q

what part of the engine is anti-iced during engine anti-icing operation

A

engine cowl lip

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11
Q

how does switching the engine anti-icing switch to ON affect the aircraft systems (anti-ice and other)

A
  • cowl anti-ice valve opens
  • sets stall warning logic for icing conditions
    • adjust stick shaker and minimum maneuver speed bars on the ASI (FMC VREF not adjusted)
    • stall warning logic returns to normal when engine anti-ice is positioned OFF if wing anti-ice has not been used in flight
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12
Q

what happens if the cowl anti-ice valve fails to move to the position as indicated by the switch

A
  • COWL VALVE OPEN light remains illuminated bright blue
  • amber TAI indication illuminates on the CDS after a short delay
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13
Q

why does the amber COWL ANTI-ICE light illuminate

A

due to excessive pressure in the duct leading from the cowl anti-ice valve to the cowl lip

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14
Q

what part of the wing is anti-iced during wing anti-ice operation

A

3 inboard leading edge slats

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15
Q

how does switching the wing anti-ice switch to ON affect the aircraft systems on ground (anti-ice and other)

A
  • opens both wing anti-ice control valves if:
    • thrust on both engines is below the setting for takeoff warning activation; AND
    • temperature inside both wing distribution ducts is less than the thermal switch activation temperature
  • closes if either of the above conditions no longer present (thrust high OR temp high)
  • wing anti-ice switch remains in the ON position regardless of the valve position but will trip off automatically at liftoff
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16
Q

how does switching the wing anti-ice switch to ON affect the aircraft systems in flight (anti-ice and other)

A
  • opens both wing anti-ice control valves
  • sets stall warning logic for icing conditions:
    • stall warning logic adjust stick shaker, minimum maneuver speed bars on ASI (FMC VREF not adjusted)
    • stall warning logic remains set for icing conditions for the remainder of the flight, regardless of subsequent wing anti-ice switch position
  • duct temperature and thrust setting logic are disabled and have no effect on control valve operation in flight
  • valve position is monitored by VALVE OPEN light
17
Q

window ‘OVERHEAT’ light
- illuminated

A
  • overheat condition is detected
  • electrical power is interrupted
18
Q

window heat ‘ON’ light
- illuminated
- extinguished

A

illuminated:
- window heat is being applied to selected window
extinguished:
- switch is off
- overheat is detected
- system failure
- system is at correct temperature

19
Q

‘WINDOW HEAT’ sw

A
  • ON = window heat is applied to selected window
  • OFF = window heat not in use
20
Q

‘WINDOW HEAT’ test sw
- OVHT
- PWR TEST

A

OVHT:
- simulated an overheat condition
PWR TEST:
- provides a confidence test

21
Q

‘WINDSHIELD AIR’ knob

A

-provides air for no. 1 window defogging

22
Q

windshield wiper selectors

A
  • PARK = turns off wiper motors and stows wiper blades
  • INT = 7 second intermittent operation
  • LOW = low speed operation
  • HIGH = high speed operation
23
Q

probe heat lights:
- illuminated

A

related probe is not heated
(if operating on standby power, probe heat lights do not indicate system status)

24
Q

probe heat switches
- ON
- AUTO

A

ON:
- power is supplied to heat related system
AUTO:
- power is automatically supplied to both A and B probe heat systems when either engine is running

25
Q

‘COWL ANTI-ICE’ light
- illuminated

A
  • indicates an overpressure condition in duct downstream of engine cowl anti-ice valve
26
Q

‘COWL VALVE OPEN’ light
illuminated:
- bright
- dim
extinguished

A

illuminated:
- bright = cowl anti-ice valve is in transit OR position disagrees with switch position
- dim = cowl anti-ice valve OPEN (sw = on)
extinguished = cowl anti-ice CLOSED (sw = off)

27
Q

engine anti-ice valve switch
- ON
- OFF

A

ON:
- cowl anti-ice valve = OPEN
- stick shaker logic set for icing conditions
- green TAI indication on engine display
OFF:
- cowl anti-ice valve = closed
- stick shaker logic returns to normal if wing anti-ice has not been used in flight
- green TAI indication of engine display extinguishes

28
Q

TAI indication
- green
- amber

A
  • green = cowl anti-ice valve is open
  • amber = cowl anti-ice valves switch not in position as indicated by switch
29
Q

wing anti-ice ‘L/R VALVE OPEN’ lights
illuminated:
- bright
- dim
extinguished

A

illuminated:
- bright = wing anti-ice valve in transit or not in controlled position
- dim = wing anti-ice valve is open (SW = ON)
extinguished = wing anti-ice valve is closed (SW = OFF)

30
Q

wing anti-ice switch:
- ON (ground/air)
- OFF

A

OFF = wing anti-ice valves closed
ON (in air):
- wing anti-ice valves open
- stick shaker logic is set for icing conditions (remains set for icing conditions for the remainder of the flight)
ON (ground)
- wing anti-ice valves open if:
- thrust below takeoff warning config warning
- duct temperature below thermal switch
- wing anti ice valves close if either of the above are not met
- switch trips off at liftoff

B737 (10 decks)

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