skyblue CBT ice and rain protection Flashcards
what does pneumatic air provide air to?
- wing leading edges
- stabiliser leading edge
- engine intake
- gas paths
where are chordwise boots used?
wing leading edges and gas paths
what is used for the engine intakes?
annular boot which inflates at the inlets
how is a deflated boot held to the surface?
`bleed air venturi effect
what controls inflation of the boots?
associated distribution valve
how many dual distribution valves are there?
7.
- 1 each for the intakes
- 2 on each wing
- 1 for horizontal stabliser
what gets heated electrically?
- prop
- windshields
- probes
- static ports
- flight control horns
what powers the prop heat?
ACW BUS 1 and 2
What powers the de icing on the TAT, pitot and alpha probes?
ACW BUS 1 and 2
what powers the standby pitot tube de icing?
STBY 115V ACW
ACW BUS 1
what powers heating for the 2 forward windshields?
ACW BUS 1 and 2
what powers heating for the 2 side windshields?
DC BUS 1 and 2
what powers de icing for the control horns?
ACW BUS 1 and 2
where is the icing evidence probe?
under the captains windshield
what controls the icing probe light?
nav light switch
where is the ice detector probe located?
in between the boots underneatth the left wing
what powers the ice detector probe?
ACW BUS 2
What will we get when ice is acrueing on the detector probe?
master caution and icing annunciation
when is the aural alert chime for the icing probe inhibited?
when the de ice boots are activated
when will the ICING light illuminate?
when 0.5mm of has have accrued on the probe. at this point a heat cycle will be started to remove the ice and start the process again
will the icing probe detect supercooled droplets
not reliably
what provides air for the engine and wing antic icing?
high pressure bleed system
where is HP bleed air tapped for the icing system?
before the bleed valve
can low pressure air be used for de icing?
no
what opens de ice valves?
pushing the AFR AIR BLEED valve to on
what delivery pressure do the icing valves deliver through modulation?
20.3psi
does the position of the bleeed valves affect position of te icing valves?
no
where does air travel after the icing valve?
dual distribution valves which are electrically powered and pneumatically operated
what powers the left dual distribution valves?
DC EMER BUS
what powers the right dual distribution valves?
DC BUS 2
where to the dual distribution valves for the inlet split air to?
engine intake boot
engine throat boots
what does the S flow gas path system do?
ejects inlet ice overboard
what do shutoff valves isolation downstream of the dual distribution valves do?
prevent air from entering the de icing system if there is a leak downstream
what do the isolation valves connect?
connect pneumatic air supply from each engine to a common manifold. this allows rhe system to remain operative when OEI
what powers the isolation valves?
DC ESS BUS
when are the isolation and de ice valves open?
AFR AIR BLEED button pushed to on
what does the common manifold supply air to?
wing and stabiliser distribution valves
what determines icing cycles with the mode selector in auto?
ADCs
MFCs
what are the wing and stabiliser de icing systems controlled by?
AIRFRAME pushbutton and MODE SEL AUTO pushbutton
in what order do the boots cycle?
- intake boots A
- intake boots B
- outer boots A
- outer boots B
- inner boots A
- Inner boots B
7 stabiliser boots A
8 stabiliser boots B
what controls the A boots
MFC 1
what controls the B boots?
MFC 2
in auto, how often will the boots cycle if temperature is greater than -20?
60 seconds
with a 20 second dwell period between each inflation
in auto, how often will the boots cycle if temperature is less than -20?
180 seconds
140 second dwell period between each inflation
when is horn anti icing inhibited?
on the ground
what powers the anti icing control panel?
DC EMER BUS
What does green ICING AOA on the FMA and on he ice detector panel mean?
staling AOA threshold has been lowered by selection of horn anti icing
how can the green ICING AOA light be extinguished?
manually by pressing the HORNS button when clear of icing
what blade heating elements are electrically connected?
every other blade
in normal operation how are the props heated?
in a similar fashion to the engine and wing de icing
how do we select high power prop anti icing?
MODE SEL SAT less than -10C button
what is the prop heating cycle in the low power cycle?
Prop 1 blade: 1/3/5
prop 1 blade 2/4/6
and then repeated on the other prop.
10 second cycles
wha is the interval between prop heating cycles in the low power cycle?
10 seconds
when is the low power prop heating cycle used?
between 0 and -10C
when can we manually control the prop heating cycle with the MODE SEL SAT -10 button?
MODE SEL button in manual
how does the high heating cycle for the props vary from the low?
20 seconds of heat and no pause between cycles
when is the high heating cycle for the props used?
between -10 and -30
below what temp do supercooled droplets cease to be a problem?
-30
what does the temperature controller on the windshield maintain on the inside and outside plies of the windshield?
outside: above 2C
inside: above 21C
what are the side windows heated to?
above 20C
what powers the side window heat?
DC BUS 1/2
What are static ports powered by?
DC BUS 1 and DC BUS 2
when is TAT probe heating inhibited and not monitored?
on the ground
when does the FWS not monitor static port heating?
in flight
what is the captains windshield wiper powered by?
DC ESS BUS
what is the FO’s windshield wiper powered by?
DC BUS 2
what is max windshield wiper speed?
above 160 knots
when will the icing label flash?
whe ice is detected with horn or airframe anti ice selected off
what does an amber A-icing detect caution mean?
ice detector probe has failed
what signifys a fault detected during anti icing test?
A ICING DETECT, master caution and single chime
when will the cyan AIRFRAME on the mfd flash?
when the system is still on 5 minutes after 0 ice accretion detected
when does a fault illuminate on a de icing push button?
- incorrect inflation sequence of boots A and B
- no or low bleed pressure downstream of the vale with the system selected on
- airbleed push button off with temperature greater than 230C
when will airframe de icing not be available?
with AFR AIR BLEED pushbutton selected off
when will an AFR AIR BLEED fault illuminate?
- air pressure downstream of de ice valve is less than 14psi for more than 10 seconds
- temp greater than 230C
what does pressing the AIRFRAME push button do?
signals the MFC to start a de icing cycle
what does a FAULT ON THE AIRFRAME push button mean with a master caution?
when a distribution valve is commanded closed but pressure still exists downstream
when the valve is open but commanded closed
what is automatically activated if the MODE SEL button displays a fault?
FAST mode. button is also disabled
when does a FAULT show on the MODE SEL button?
MFC 1B or 2B failure
CPM failure
IOM failure
what does the emergency mode do throught the de icing override push button?
sets a timing cycle of 60 seconds and OVRD displays in blue
what does a fault on the DE ICING OVERRIDE button mean?
failure of both MFC resulting in incorrect boot inflation
when will a FAULT show on the horn buttons?
when a horn is not powered when it should be
when does a FAULT show on a prop anti icing button show?
when there is a failure of one of the heating elements
what does aircraft performance monitoring (APM) monitor?
- aircraft drag when in icing conditions
- aircraft cruise speed
- minimum severe icing speed is respected
when is apm activated?
- airframe icing on
- icing AOA light on
- ice accretion detected
- less than 10C
- clean config
- both engines operating
where does the APM get weight info in order to compare actual drag with theoretical drag?
FMS or an estimation
how will the APM signal an abnormal drag increase?
DGD PERF and master caution
when will the APM generate an amber INCREASE SPEED caution?
when lower than minimum severe icing speed +2
when will the APM generate a cyan CRZ SPD LO?
cruise speed is less than 10 below max cruise speed, and there is a small drag increase
how is APM controlled?
APM push button
