5_ANTI-ICE & RAIN

Question 1

What systems use anti-ice and rain systems?

Answer 1

Engine AI

Wing AI

Probe & sensor heat

Flt deck window heat

windshield wipers

Question 2

Where is location of the heating element on windows 1 & 2?

What about windows 3 (4 & 5) if installed?

Answer 2

1 & 2: conductive coating on the OUTER glass pane permits electrical heating (prevent ice and fogging)

3-5: conductive coating on the INNER pane

Question 3

What window is associated with the FWD window heat switch? SIDE switch?

Answer 3

Fwd: window #1

Side: window #2-5 (or just #2 in the YK 634 mode)

Question 4

What is the purpose of heating the windows in addition to ice and fog?

Answer 4

Temp controllers maintain temp to ensure max strength in the event of bird impact.

Question 5

What happens to the heat if the window temp controller senses and overheat?

Answer 5

power is automatically removed

Question 6

What controls the window heat?

Answer 6

Window heat temp controllers.

Question 7

What probes are heated, how are they heated and are there any sensor that are NOT heated?

Answer 7

Pitot probes, alpha vanes, TAT probe - all heated electrically

Static probes are NOT heated at all.

Question 8

What is the heating configuration for the probes if only on STANDBY power?

Answer 8

Only the capts pitot probe is heated - however the CAPT PITOT light does NOT illuminate for a failure.

Question 9

What does the Engine AI air protect?

Answer 9

prevents ice on engine cowl lip.

Question 10

Can the eng AI be operated on the ground and in the air?

Answer 10

Yes.

Question 11

Describe the operation of the Engine Cowl AI valve.

Answer 11

Each Eng AI cowl valve is ELECTRICALLY controlled and PRESSURE activated.

Question 12

What happens when you put the ENG AI switch on?

Answer 12

allow bleed air to flow through the cowl AI valve

sets stall warning logic for icing conditions.

Question 13

What happens to the stall warning logic with AI selected?

Answer 13

it adjusts stick shaker and min maneuver speed bars on the airspeed indicator

FMC displayed VREF is NOT adjusted automatically

* everything returns to normal when ENG AI positioned back to OFF as long as WING AI was not used.

Question 14

When using AI, is hte FMC displayed VREF adjusted automatically for ice speeds?

Answer 14

No.

Question 15

What indications do you get if the cowl AI valve fails to move to the position requested?

Answer 15

the COWL VALVE OPEN light remains illuminated bright blue

amber TAI indications illuminates on the CDS.

Question 16

What does the AMBER Cowl ANTI-ICE light mean when illuminated?

Answer 16

it illuminates due to excessive PRESSURE in the duct from the valve to the lip

Question 17

What does the WING AI protect?

Answer 17

protects the 3 INBOARD leading edge SLATS using bleed air.

Question 18

What does the WING AI NOT protect?

Answer 18

It does not protect the outboard LE slat or LE flaps.

Question 19

What powers the WING AI control valves?

Answer 19

AC motor operated.

Question 20

Can the WING AI be used in any flap/slat position?

Answer 20

Yes.

Question 21

How does the WING AI system work on the ground?

Answer 21

with switch ON - it OPENS BOTH control valves

(if thrust is below takeoff warning activation setting AND temp in AI ducts is

* if EITHER engine thrust is set above TO warning or EITHER temp sensor senses duct overtemp - then BOTH valves CLOSE.

• the valves AUTOMATICALLY reopen if temps and thrust setting are good -
• the WING AI SWITCH stays in the ON position as long as you are on the ground, it will TRIP OFF at lift off (Air / Grd switch) -

Question 22

What happens when you select WING AI in FLIGHT?

Answer 22

Opens BOTH control valves

sets stall warning logic for icing conditions

* adjusts stick shake and min maneuver speed bars - FMC displayed VREF is NOT automatically adjusted for ICE

** stall warning logic remains set for icing conditions for the remainder of the FLIGHT regardless of AI switch position.

Question 23

Does throttle position and duct temp impact the WING AI operations during flight?

Answer 23

No - only on the ground.