Anti-Ice, Rain

Question 1

(756) Recall when the use of engine anti-ice is required.

Answer 1

On the Ground –
 Engine anti-ice must be selected ON immediately after engine start and remain on during all ground operations when icing
conditions exist or are anticipated.
 Icing conditions exist when the TAT is 10°C or below and any of the following conditions apply:
- Visible moisture defined as: Clouds, Fog with visibility less than
one statute mile or 1600 meters, Rain, Snow, Sleet or Ice crystals.
- Ice, Snow, Slush or Standing Water is present on the ramps, taxiways, or runways.

Note: Engine anti-ice is not required on the ground when the temperature is below -40°C OAT

In Flight –
757 Operating Procedures
Operate engine A/I ON when in visible moisture and TAT is +10°C or below. No exceptions.

767 Operating Procedures
Engine anti-ice must be AUTO or ON during all flight operations when
icing conditions exist or are anticipated, except during climb and cruise when the temperature is below -40°C SAT. Engine anti-ice must be AUTO or ON before, and during descent in all icing conditions, including
temperatures below -40°C SAT. [AFM]
- When operating in areas of possible icing, activate engine anti–ice before entering icing conditions.

Note: Engine anti-ice must be in AUTO or ON before, and “during descent in all icing conditions”, even when temperatures are below -40°C SAT.

Question 2

(756) Recall the conditions that require the use of the wing anti-ice.

Answer 2

All Aircraft.
 For aircraft with or without ice detectors installed, ice accumulation on the flight deck windshield frames, windshield center post,
windshield wiper arm, or side windows can be used as an indication of airframe icing conditions.

CAUTION: Do not operate wing anti–ice when the total air temperature (TAT) is above 10°C.

Question 3

(756) Recall when the probe heat operates.

Answer 3

When an engine is operating

Question 4

(756) Describe the proper switch / selector positions for the ground and airborne use of the wing and engine anti-ice systems in icing conditions.

Answer 4

 “IN” icing conditions:

“Switch” airplanes:
- On the ground 
   – WING off
   – L/R ENG ON.
- Airborne (After Take-off 
   Flow)
    – WING ON or off as 
   required
    – L/R ENG ON.

“Selector” airplanes:
 - On the ground 
    – WING OFF
    – L/R ENG ON.
 - Airborne (After Take-off 
   Flow) – WING AUTO.
   L/R ENG AUTO.

Note: “AUTO / AUTO / AUTO” accomplished on the After Take-off Flow

Note: Engine bleed air MUST be used for anti icing as the APU bleed air is insufficient. During single engine taxi, when engine anti-ice is required, operate one pack only.

Question 5

(756) Describe the proper switch / selector positions for the ground and airborne use of the wing and engine anti-ice systems when NOT in icing conditions.

Answer 5

 ”NOT IN” icing conditions:

“Switch” airplanes:
 - On the ground 
    – WING off
    – L/R ENG off.
 - Airborne 
    – WING off.
    – L/R ENG off.

“Selector” airplanes:
 - On the ground 
     – WING OFF.
     – L/R ENG AUTO.
 - Airborne(After Take-off 
   Flow)
    – WING AUTO.
    – L/R ENG AUTO.

Note: “AUTO / AUTO / AUTO” should be selected on the after takeoff
flow.

Question 6

(756) Know that only on “Switch” equipped aircraft, EICAS advisory messages will appear as the ice detection system cycles, such as ICE DET ON and ICE DET OFF,

Answer 6

EICAS messages do not appear as the ice detection system cycles on “Selector” equipped aircraft.

Question 7

(756) Recall when wing anti-ice operation is inhibited.

Answer 7

On the ground

Question 8

(756) Recall which bleed air source (Engine or APU) of pneumatic air should be used for engine and wing anti-icing.

Answer 8

Engine bleed air must be used for all anti icing; APU bleed air is insufficient.

Question 9

(756) Explain the meaning of an illuminated CAPT or FO PITOT light

Answer 9

 Illuminated (amber) –
-The aircraft is on the ground and neither engine is operating
Or
-The probe is not being heated

Question 10

(756) Explain the meaning of an illuminated ICING light.

Answer 10

“Switch” airplanes.
ICING light
 Illuminated (amber) – the ice detecting sensor has detected ice.

“Selector” airplanes.
ICING light
 Illuminated (amber) – Engine / wing icing is detected and either
engine or wing anti-ice is manually selected OFF or an anti-ice valve is closed.

Note: With icing detected and an anti-ice valve closed (failed) the icing light would be accompanied by a valve light.

Question 11

(756) Explain the meaning of an illuminated WINDOW HEAT INOP light.

Answer 11

Window Heat Inoperative (INOP) lights

 Illuminated (amber) – the window is not being heated.

Question 12

(On 767 aircraft with anti-ice “Selectors”). Explain the meaning of an illuminated ICE DET (ice detector) light

Answer 12

Ice Detector (ICE DET) light
 Illuminated (amber) – ice detector system is failed.

NOTE: This is because BOTH ice detectors have failed.

Question 13

(756) Recall that “Selector” equipped aircraft with WING and L/R ENG selected to AUTO do not generate EICAS messages or discrete lights unless there is a system fault.

Answer 13

 In AUTO, an engine anti-ice fault is indicated by a discrete ICING light and a discrete L/R ENG VALVE light.

• The discrete ICING light will produce the Master CAUTION EICAS message ICING ENGINE.
• The discrete L/R ENG VALVE light will produce the ADVISORY EICAS message (L/R) ENG ANTI-ICE.

In AUTO, a wing anti-ice fault is indicated by a discrete ICING light and
a discrete L/R WING VALVE light.
- The discrete ICING light will produce the ADVISORY EICAS message ICING WING.
- The discrete L/R WING VALVE light will produce the ADVISORY EICAS message L/R WING ANTI-ICE.