dash 8 200/300 ice protection

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1. icing conditions exists when: <10 degrees c on ground
<5 degrees in flight
visible moisture '

or 10 degrees or less with ice slush standing water snow on ground or ramp
2. prop heaters powered by: 115v AC variable
3. how can you monitor individual blade heaters for excessive loads: monitor
individual phases of AC power
4. how are prop heaters protected on ground: through WOW switches which
deactivate heaters
5. propeller timing above 10 degrees: 40seconds on 30 seconds off
6. propelor timing below 10 degrees: propellors pair engergized for 20 seconds
with a dwell time off 60 seconds this causes props to continually cycle
7. propeller heating test
how
precautions: when held in the test position the blades will heat in the folloing
sequence
1-3-2-4.
kept test to a minimum to avoid over heat
8. regulators provide PSI to inti ice system at what PSI and what is the pressure
regulator PSI: deice 18PSI
pressure regulator 21 psi
9. isolation valve provides what and how is it controlled: isolates the 2 deicing
systems and can beopened in the event of engine failure to tie both side together.

may be moved to closed to check pressure in each individual system

may be closed if a major tear in a boot has occurred

10. how many boots per side of wing: 7
11. set one boots: 2 outer boots on each wing
12. set 2 boots: 3rd boot in from each wing
13. set 3: 4th boot in from right wing
right engine nacelle
inner right boot of nacelle
outer boot next to left engine
14. set 4: 5th boot in from right wing
inner boot next to left nacelle
engine naclle
4th boot in on left wing
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15. set 5: inner leading edge of horizontal stab
upper boot on vertical stab
16. set 6: outer horizontal stab
lower vertical stab
17. each set inflates for how long: 6 seconds
18. total cycle duration: 36seconds
19. fast selection on boot control takes how long: 36sec on 24secs off
total 1 min
20. slow selection on boot control takes how long: 36 sec on
3 min 24 off
4 min total
21. if airframe auto switch is selected off half way through cycle what happen-
: it will complete inflation cycle then switch off
22. lights indicating boot inflation will illuminate if: pressure downstream from
the distributor is greater than 15 psi
23. when not in use how are boots stowed: using deice system pressure an
ejector provide suction through the boot to keep them from being inflated
24. CAUTION LIGHT
"DE ICE PRESSURE": IF system pressure drops below 5.5 PSI
25. Airframe manual can be used how: It is used by selecting the knob clockwise
and pausing for 6 seconds to inflate the boots
26. If a boot rupture occurs and icing is present what precautions should you
undertake: don't operate in auto mode as you may get asymmetrical ice
only use manual mode on the engine intakes and tail surfaces
27. automatic heater s are provided for many of the de-icing system when will
they activate: below 10 degrees c
28. Valve heat switch controls what: Heating of the distribution valves
29. elevator horns are powered by: 115vAC single phase and controlled by 28v
DC
30. how are elevator horns heating controlled and what protection is given: -
elev horn switch on icing panel
WOW signals stop heater activation when on ground or when temps being above
15degrees
31. CAUTION LIGHT
L or R ELEV HORN HEAT: The 115v phase has failed
the element has failed
will only illuminate when temp <10 degrees
32. elevator horn heat test how: push test button to test
caution lights illuminate
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power applied to elements and begins to heat
caution lights go out
33. are there any other way to heat elevator horns if the element is damaged: -
yes a second heating element is available however an engineer is required to move
it across
34. when do engine intake heaters run: doors open
engines on
OAT < 15degrees C
35. how are window heat controlled: via rotating knob with 3 positons for front
windows
off
warm up
on

and a switch for side window on/off

36. windshield heat provides 3 things: anti icing
anti misting
bird strike protection
37. windshields are heated by what power source and at what temp: 115V AC
variable AC left window left bus right window right bus

temp 42 degrees
38. what selection is made first when selecting wind shield heat: Warm up
which provides reduced power to the heater to prevent thermal shock
39. CAUTION LIGHT
L WSHLD HOT , R WSHLD HOT, or SIDE WDO HOT

what must you do to reactivate window heat: Temp is greater than 50degrees
amd power has been removed

move heater to warm up after it has cooled

40. SIDE WDO HOT caution light after it has cooled does it need to be reset to
warm: no
41. wind shield wipers have what control positions in the cockpit and what
power drives system: off
low
high

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park (spring loaded) moves wiper to bottom of screen at parker position
28v DC secondary bus
42. ice detectors are positioned where and what do they indicate: on the wind-
shield wipers
ice is forming on aircraft
43. AOA vanes are heated by what power source and how are they turned
on: 115v variable AC automatically controlled by stall computers
44. If AOA vane heating fails what will occur: STICK PUSHER
STALL SYS FAIL caution light will illuminate
45. how are pitot and static pressure plates heating turned on: switches on icing
panel
46. what are the power sources for pitot heat: capt pitot and static heating
powered by 28V DC LEFT ESS BUS

Co-pilot pitot and static heater powered by 28V Right main bus
47. CAUTION LIGHTS
PITOT HEAT 1 and PITOT HEAT 2: PITOT head is not receiving 28v power

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