ORAL *145 Ice and Rain Protection Flashcards
Which areas are heated by bleed air?
Wing and horizontal stab leading edges
Engine - air inlet lips
Which areas are heated electrically?
Windshields Pilot tubes, and Pitot-static tube AOA sensors, and TAT probes ADC and Pressurization static ports Lavatory water drain, and Water supply service nipples
When are the ice protections systems (with exception of windshield heat) turned on?
Automatically when ice is detected by either by either ice detector
How is ice protection turned on manually?
OVERRIDE knob to ALL
Any restrictions or limitations on using engine inlet anti-icing on the ground?
No, engine inlet has enough airflow surrounding the lip
Which side of pneumatic system supplies horizontal stab anti-icing?
Left side
FADECs ensure minimum available thrust when ice detected, even during low thrust settings. When is this logic inhibited?
When landing gear is extended.
Can APU bleed air be used for anti-icing?
No, it is not hot enough
When do wing and stabilizer anti-icing valves open?
Ice Detection Test Knob is set to 1 or 2,
OR
Inflight or on ground >25 kts, AND
Ice Detection Override knob set to All
OR
Ice Detection Override Knob set to AUTO or ENG and ice is detected
How many seconds should ice detection test be limited to?
15
When do engine anti-ice valves open?
Ice Detection Test Knob is set to 1 or 2
Ice Detection Override knob set to ALL or ENG
Ice Detection Override Knob set to AUTO and ice is detected
When should PPG Windshield heat be turned on?
It may be turned on anytime
When are Pitot, Pitot-Static, AOA, and ADC and Pressurization Static ports heated?
Whenever at least one engine is running (N2 >56.4%)
When are TAT probes heated?
When thrust levers above > 65% TLA, or when airplane is airborne
When are lavatory waste water drain and water service nipples heated?
When DC Bus 1 powered
What is indication that Engine Anti-Ice Valve is open?
OPEN legend illuminated in associated push button on ICE PROTECTION Panel
What does the PITOT 1/TAT 1/ AOA 1 push button control?
Controls heating to these sensors
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What does the Ice Detection Test Knob do when selected to 1 or 2?
Simulates icing conditions on associated detector.
When is an ice protection test required?
Once a day (not necessarily the first flight of day) when icing conditions are forecast.
When is Ice Protection Test A required?
For takeoffs when icing conditions exist or are anticipated for takeoff or climb.
Perform icing test A
a. Thrust ……………………………..83% N2 (min)
b. Ice Detection Override knob … ………..ALL
c. Anti-Icing buttons (eng, wing, stab) … IN dark
d. Ice Detection Test knob ………………….1(2)
e. Thrust Levers ………………………………..IDLE
f. Ice Detection Override knob…ENG or AUTO
During an icing Test A, what indications should you see?
a. OPEN lights on each push button,
b. ICE DET 1(2) FAIL caution
c. BLD 1(2) LOW TEMP caution
d. ICE CONDITION advisory
e. maybe CROSS BLD OPEN advisory
How long should Ice Detection Test knob be held in 1(2) position?
At least 10 secs, no more than 15 secs
How long should you wait after releasing the Ice Detection Test knob before testing the other side?
Until all the Test A EICAS messages no longer displayed
If Ice Test A unsuccessful, what should be done?
Thrust Levers set to idle, and do a second test following same procedure
What does ENG on the Ice Protection Override knob do?
Turns on engine air inlet anti-icing for ground speeds below 25 knots.
Above 25 knots, the wing and horizontal stabilizer anti-icing systems are also turned on if icing conditions are detected.
What happens if ice is detected by ice detection system 1or 2?
a. the bleed air anti-icing system activates automatically
b. an SPS angle of attack set values reduction
c. an advisory message on the EICAS
When ice is detected, how long does the icing signal remain active?
60 seconds
When ice is detected, how is the ice removed from the probe?
An internal ice detector heater is activated to deice the probe. When the probe’s natural frequency is recovered, heating is de-energized.
What is the maximum temperature for anti-icing operation?
10 deg C
What is the minimum temperature for manual anti-icing operation?
-40 deg C
What is the maximum altitude for operation with a single engine or single bleed in icing conditions?
15,000 feet
What is the required holding configuration and icing conditions?
Gear up, Flaps up, minimum airspeed 200 KIAS
Define icing conditions.
Icing conditions may exist whenever static air temperature (SAT) on the ground or for takeoff, or total air temperature (TAT) in flight, is 10° C or below and visible moisture in any form is present (such as clouds, fog with visibility 1 mile or less, rain, snow, sleet, and ice crystals).
Icing conditions may also exist when the SAT on the ground and for takeoff is 10° C or below when operating on ramps, taxiways, or runways where surface snow, ice, standing water, or/maybe ingested by the engines or freeze on the engines, nacelles, or engine sensor probes.
What is the maximum windshield wiper operating speed?
170 KIAS
What does the AUTO position of the ice detection override knob do?
Allows automatic operation of the bleed air anti-icing system. If ground speed is >= 25 knots and icing condition is detected, wing and horizontal stabilizer anti-icing systems are turned on.
Engine anti-icing is turn on as soon as an icing condition is detected, regardless of speed.
What does the ALL position of the ice detection override knob do?
Turns on the complete bleed air intake Anti-Icing system if the airplane is on the ground and ground speed is equal or above 25 knots, or in-flight.
On the ground, below 25 knots, only engine anti-icing is turned on.
