Ice and Rain protection Flashcards
From which ebg part is bleed air for anti ice taken
Compressorn4 and 6 stages
how the ice detectors work when anti ice is on or auto?
If either ice detector senses ice accumulation, a signal is sent to the Integrated Air System Controller (IASC) to open the wing anti-ice valves and to the Full Authority Digital Engine Control (FADEC) to open the Cowl Anti-Ice Valves (CAIVs)
A signal is also sent to the Fly-By-Wire (FBW) system to adjust the stall warning parameters.
How long ICE advisory stays on after ice is detected?
1 min
How long antiice system will remain on after ICE advisory is gone?
2 mins
At what point does the WAI system activates after takeoff when set to AUTO?
At 1500ft or 2 mins after takeoff
Until what altitude is cowl anti ice inhibited if selected AUTO?
When selected auto, it is inhibited during takeoff up to 1500ft or 2 mins
When is WAI inhibited?
On ground below 60kts except when testing
Are the leading edge inner slats deiced?
No, they do not accumulate a lot of icing
What is IASC and what does it do?
Integrated Air System Controller. Two Integrated Air System Controllers (IASCs) manage and control all the aircraft bleed valves. Each IASC has three channels: A channel, B channel, and a safety channel C (refer to Figure 02−02−8).Channels A and B alternate control on a daily basis
How do ice detector probes work?
The sensing element in the ice detector probe is an electrical oscillator that vibrates at a specific frequency. Ice on the sensing element is detected by a change in the vibration frequency of the oscillator. When ice is detected, the sensing element momentarily heats up to de-ice.
When does amber ICE displays on EICAS?
When ICE is detected but WAI is off
Which stage engine compressor bleed air is used by cowl anti ice?
6th stage
How many anti ice Cowl temperature sensors each engine has?
2 sesnsors each engine
When are all air data probes and sensors heated?
With weights off wheels is sensed and when engine is running. Theyy modulate below 55kt and on all the time above 55 kt
When are angle of attack vanes heated?
Whenever AC has ground, APU, battery (any electrical power) or engine power
Where are air data computers located?
At the base of each ADS probe
When are P2T2 probes heated?
Whenever any engine is running
With AUTO selected, what controls the Cowl anti ice system?
Ice detection system and EECU
How odes each air date probe look?
How many heating elements are in each Window?
3
What happens when the aircraft is on the ground and the PROBE HEAT switch/light on the overhead panel is pressed? (select three responses).
The ADS PROBE HEAT GND ON status message displays on the EICAS
The GND ON legend illuminates
Air data system probes (ADSPs) and total air temperature (TAT) probes heat turns on
What is the purpose of the sensing probe in the ice detection system? (Select two responses.)
Monitors the ice on the probes
Detects a change in vibration frequency
The fan inlet cone and cover are de-iced using 6th stage engine bleed air.
False ? From able test
