Bleed air is used for:
Engine Cowl and Wing anti-icing
Ice detection probes are:
How does an Ice Detection Probe work?
The probe vibrates at a high frequency, when ice forms on the probe, the frequency is dampened and ice is detected.
For every 60 seconds of operation, the probe is heated for 5 seconds to melt off the ice so it can continue to detect icing conditions.
With the Wing and Cowl Icing off, and ice is detected, what message and light indications will you get?
ICE caution message is displayed and the ICE DET switchlight on the ANTI-ICE control panel illuminates
What happens to the ICE caution message on EICAS when Wing and Cowl Anti Icing is turned on and operating?
The ICE caution message turns into an Advisory message
When the airplane is clear of icing, what happens to the ICE advisory message?
After a pre-determined set of time with no ice being detected, the ICE advisory message goes away
Do the side windows in the cockpit only operate at a low setting?
Yes, since they only have de-mist, and de-fog capabilities
What is the HIGH setting used for on the windows in the cockpit?
The high setting is only for the left and right windshields and is for shedding Ice accumulations
The left and right Pitot/Static probes are heated how?
The Ice Detector switch/light illuminates amber to indicate aircraft entry into icing with:
Wing and/or cowl anti-ice off
The windshield wipers have two control panels, one for the captain and one for the co-pilot. Do the wipers operated seperately or together?
With either the Left or Right control panel selected on, BOTH wipers work together, regardless if the other panel is set to off
What determines the speed the wipers work at?
The last input from either wiper control panel determines the operating speed and or mode
At what point does the ADSCH (Air Data Sensor Heater Controls) energize all probes and sensor heaters regardless of probe or generator switch position?
Weight Off Wheels(Air Mode)
When an engine generator is supplying the electrical buses and the probe
switches are OFF the ADSHC applies half power to which probes when in ground mode?
The three pitot heads.
No other probe receives power. Selecting the probe heater switches to ON, continues to supply half power to the three pitot heads but full power is applied to the standby static ports and AOA sensors. The pitot bases and TAT are not heated.
What does the DET TEST switchlight test when pressed?
Air Data Probes
How are the Piccolo tubes in slats 1,2 and 3 interconnected?
How many temperature sensors are used for the Wing Anti Ice?
8 sensors in total
4 in each wing
4 in each wing
- 2 inboard
- 2 outboard
What are the dual functions of the temperature sensors mounted outboard near the wing tips for Wing Anti Ice?
The Outboard sensors are used to detect:
- Detect insufficient temperature
- Detect failure of the Piccolo tubes
What are the dual functions of the temperature sensors mounted inboard near the wing rot for Wing Anti Ice?
The inboard sensor supplies the temperature data used by the AILC to:
- modulate the wing anti-icing valves.
- The sensor also detects when the wing overheats (WING OVHT warning message)
What occurs with the Windshield Heat on LOW?
All 4 panels are heated to 24c
What occurs with the Windshield Heat on HIGH?
Side windows are heated to 24c
Windshields are heated to 41c
What is a good ICE detector test indication?
ICE caution message
ICE switchlight illuminated
ADS HEAT TEST OK advisory message
When is wing anti ice required to be on during flight operations?
TAT <= 10c in visible moisture with airspeeds < 230 kias (except when SAT is <= -40c) or when ice is annunciated
When is cowl anti-ice required to be ON during flight?
TAT <= 10c in visible moisture (except when SAT is <= -40c) or when ice is annunciated
If Type II, III, or IV deicing fluid has been applied, when do you turn on wing anti-ice departing an airport?
Just prior to increasing thrust for takeoff
When must the 90% HOTS card be used?
If the Slats / Flaps are extended in the takeoff config during de-icing
After deicing/anti-icing the crew notes a decrease in the intensity of precipitation. The Captain should;
Continue to observe HOT based on previously reported conditions
T/F The deice/anti-ice process can be expedited by mixing type I and Type IV fluid prior to deice.
Deice tables can be found in;
Determine HOT for following conditions:
OAT -2C, Light snow, Type IV Killfrost ABC-s plus, Concentration 100%
(Look in the GOM)
Required communications after deicing must include:
- Brand of anti-ice fluid (If type II or IV)
- The start time of the last application
- Type of fluid
T/F The flight crew is not authorized to complete a pretakeoff contamination check with the intent of extending HOT.
Deicing should be completed with the flaps extended if during preflight
Frozen precipitation has been detected in the gaps of control surfaces
Prior to takeoff within the derived holdover time, The crew shall visually check for ice and snow accumulation on aircraft surfaces. This check can be accomplished from:
- The cockpit
- The cabin
The _______________ has the final responsibility to ensure the aircraft is ready for flight.
Type one fluid (thin fluid) is heated and primarily used for:
Failure to adequately remove all contaminants from critical surfaces can result in:
- Decreased Lift
- Increased stall speeds
- Trim changes
The post deice check would normally be completed by:
The deice agent
In icing conditions, a thorough inspection of all areas where adherence of contaminants could affect normal systems operations is critical. This would include:
- AOA vanes.
- Pitot tubes.
- Fuel vents.
"Hard Wing" aircraft require a _________ ___________to assure contaminants are detected
Who is responsible to ensure that the aircraft is free from snow, ice, slush or frost contam- ination prior to each takeoff?
T/F Type I Deicing fluids are heated prior to application.
T/F On the ground, hoar frost will appear as a thin uniform deposit or ice with a fine white crystalline texture.
Type I deice fluids are primarily:
(d) (a) and (b)