7ER Anti-Ice

Question 1

How can you tell if an ice detector is installed?

Answer 1

The presence of an ICING light, either below the ENG ANTI-ICE switches (757) or above the ENGINE ANTI-ICE selectors (767)

Question 2

How many TAT probes are there?

Answer 2

752: one or two

753: two

767: one

Question 3

What is the meaning of an EICAS advisory ICE DET OFF?

Answer 3

Ice is no longer detected (the ICING light will go out)

Only present on “switch” aircraft

Question 4

What does an EICAS advisory WINDOW HEAT mean?

Answer 4

Two or more flight deck windows are not being heated

Question 5

When is engine anti-ice required on the ground?

Answer 5

After engine start and during all ground operations when icing conditions exist or are expected

Not required when OAT is less than -40c

Question 6

What is the definition of icing conditions on the ground?

Answer 6

TAT of 10c and below

Visible moisture (including visibility of <1sm or <1600m), or standing water/slush/snow/ice

Question 7

When is engine anti-ice required in flight (757)?

Answer 7

When in visible moisture with a TAT of 10c or below

Question 8

When is anti-ice required in flight (767)?

Answer 8

When in visible moisture, except during climb and cruise when SAT is less than -40c (required for descent regardless of temperature)

Question 9

When is wing anti-ice required?

Answer 9

In flight, with ice accumulation on window frames, wiper arms, or side windows

Question 10

When are the probes heated?

Answer 10

When at least one engine is operating

Question 11

Can APU air be used for anti-ice?

Answer 11

No. It is physically possible, but will not provide enough bleed air

Question 12

During single-engine taxi with engine anti-ice on, what is the required pack configuration?

Answer 12

Single pack, same side as operating engine

Question 13

On “selector airplanes”, what is the configuration on the ground when anti-ice is required, and how is it changed during the After Takeoff Flow?

Answer 13

Wing - OFF, Engines - ON

after takeoff, all selectors to AUTO

Question 14

On “selector airplanes”, what is the configuration on the ground when anti-ice is not required, and how is it changed during the After Takeoff Flow?

Answer 14

WING - OFF, engines - AUTO

After takeoff, all to AUTO

Question 15

When is wing anti-ice inhibited?

Answer 15

On the ground

Question 16

On what aircraft will the EICAS advisories ICE DET ON and ICE DET OFF display?

Answer 16

“Switch” aircraft that are equipped with ice detectors

Question 17

What parts of the wing does wing anti-ice heat?

Answer 17

The three midwing slats (757)

The three outboard slats (767)

Question 18

What is the bleed air source for wing anti-ice?

Answer 18

The bleed air manifold

Question 19

What is the meaning of an illuminated CAPT or FO PITOT light?

Answer 19

The affected probe is not being heated when it should be, or both engines are not running on the ground (normal before engine start, will not generate an EICAS message)

Question 20

What is the meaning of an illuminated ICING light on “switch” aircraft?

Answer 20

“Switch” aircraft: the ice detector has detected ice (EICAS advisory ICE DET ON displayed)

Question 21

On “Selector” aircraft, what would be the indications of a failed anti-ice valve?

Answer 21

Selectors AUTO, ICING light, and VALVE light.

(EICAS caution ICING ENGINE or advisory ICING WING, and associated advisory ENG ANTI-ICE or WING ANTI-ICE)

Question 22

What is the meaning of a Window Heat INOP light?

Answer 22

The affected window is not being heated

Question 23

On “Selector” aircraft, what is the meaning of an ICE DET light?

Answer 23

The ice detection system has failed (EICAS advisory ICE DETECTOR message)

Question 24

What is the indication of the wing anti-ice being automatically turned on?

Answer 24

There are none, unless you see the VALVE lights momentarily light up as the valves move

Question 25

How is each side’s wIper controlled?

Answer 25

Either captain’s or FO’s wiper switch controls both wipers

Question 26

If engine anti-ice is selected on, but there is insufficient pneumatic pressure, what position do the valves move to?

Answer 26

They stay closed

Question 27

What effect does engine anti-ice have on N1 limits? (GE only)

Answer 27

The N1 limit will decrease when engine anti-ice is on

Question 28

If a landing is made with wing anti-ice on, what will happen at touchdown?

Answer 28

The valves will close

Question 29

How are the engine and wing anti-ice valves controlled and operated? Do they have a fail position?

Answer 29

Electrically controlled, pneumatically operated. The fail position is the last position

Question 30

When should wing anti-ice not be used in flight?

Answer 30

When TAT is greater than 10c

Question 31

How many windows does each window heat switch control?

Answer 31

FWD - one SIDE - two

Question 32

On “Selector” aircraft, what position will the anti-ice valves be in if AUTO is selected on the ground?

Answer 32

The valves will be closed, and must be manually opened if needed by moving the selector to ON

Question 33

What is the meaning of an ICING light on “selector” aircraft?

Answer 33

The ice detector has detected ice and engine and/or wing anti-ice is selected OFF or an anti-ice valve is closed (EICAS caution ICING ENGINE and/or advisory ICING WING displayed).