section 7- ice protection Flashcards
how does the engine inlet anti ice prevent ice formation?
bleed air
the do we switch on engine anti icing?
when flying or on the ground in an atmosphere containing precipitation or visible moisture below 5C
what powers the engine inlet anti-ice?
28v DC
what protects the engine inlet anti-ice?
DE-ICE INLET LH/BUS 1 on the overhead panel
DE-ICE INLET RH/BUS2 on the AC/DC breaker panel
what controls the engine inlet anti-ice?
2 INLET toggle switches on the LH overhead switch panel
how are the wing and empannage de-icer boots operated?
engine bleed air operated
how many parts are the wing anti-ice boots divided into?
3
where are the de-icer boots?
leading edge of wings, vertical stabiliser and horizontal stabiliser
what is the reason for heating the de-icer boot ejector valves?
prevents overnight freezing of the valves
what powers the de icing boots?
28v DC
what protects the de-icer boots?
- SURF ICE/ESS BUS on the overhead breaker panel
- DE-ICE PROP LH/BUS 1 on the overhead breaker panel
what happens if the de-icer boots toggle switch is in the OFF position?
vacuum is applied to the boots to hold them against the leading edges
what happens if the de-icer boots toggle switch is in the ON position?
one single automatic cycle is activated
what happens when the de-ice boots are activated?
6-second inflation of the inner wing followed by 6 second inflation of the empennage boot and 6 seconds of outer wing boot inflation.
this illuminates the blue SURF DEICE light on the co-pilots side for 20 secs
how to the deice boots expand and contract?
pressure and vacuum using engine bleed air
what does ice need to accumulate to in order to be broken by the change in contour when the boots are inflated?
1.5cm
ice formation aft of this area will be removed by dynamic air pressure
what is each propellor blade provided with for de-icing?
de-icing mat with an outboard and inboard heating element
how is power for the propellor de-ice controlled?
a timer, through brushes and a slipring
when does the timer control prop de-icing?
when the PROP switch is ON
what does the prop de-ice timer provide?
2 heating cycles (inboard/outboard element), which will start where the previous cycle left off
when must the prop de-icing be switched on?
before entering icing conditions
what is the purpose of the ice protection plates?
to protect the fuselage from ice debris from the prop
what protects the prop DE-ICE system?
DE-ICE PROP LH/BUS 1 on the overhead breaker panel
DE-ICE PROP RH/BUS 2 on the AC/DC breaker panel
how is correct operation of the prop de-ice indicated?
a respective reading on the 2 ammeters located on the pedestal panel
what can too much operation of the windshield anti-ice on the ground cause?
distortion and bubbling in the windshield
what is the normal operating temperature of the windshields?
45C- generated by 1 or 2 static inverters
what powers the windshield anti-icing?
28v DC
what protects the windshield anti ice?
- W-SHIELD/HEAT BUS 2 on the AC/DC breaker panel
what protects the windshield anti-ice with2 static inverters?
- W-SHIELD HEAT-LH/BUS2 on the AC/DC breaker panel
- W-SHIELD HEAT-RH/NON-ESS-BUS on the AC/DC breaker panel
how is the windshield anti-icing system with 1 static inverter controlled?
W-SHIELD 3position toggle switch on LH overhead panel
how is an overheat in the windshield anti-ice signalled?
WINDSH OVERH caution light
