Ice Detection/Protection Systems

Question 1

What source are used for Anit-icing and De-icing?

Answer 1

• Bleed Air Heat
• Electrical Heat

Question 2

What uses Bleed air for Anti-ice?

Answer 2

• Engine Cowl
• 3 Outboard Slats

Question 3

What uses electric heat for Anti-Ice?

Answer 3

• Pitot-static System
• Windshields
• Water Lines
• Pressurization static port

Question 4

If an engine fails, does the opposite wing and engine receive ice protection?

Answer 4

Yes

• Crossbleed valve opens to provide bleed air to both wings
• The failed engine does not receive engine cowl bleed air

Question 5

How many ice detectors are required?

Answer 5

One

(There are two for redundancy)

Question 6

How long does the system remain active

after Icing is no longer detected?

Answer 6

5 minutes

Question 7

If “ICING” is set to OFF in the MCDU and on the T/O roll icing conditions are encountered, will the de-icing system turn on?

Answer 7

Yes

>1700ft

or

2 minutes after T/O

(whichever happens first)

Question 8

Can the APU provide bleed air for Anti-ice?

Answer 8

No

Question 9

What is protected from Ice and Rain?

Answer 9

• Engine Cowl
• 3 Outboard slats
• Smart Probes
• Windshields
• Waste and Water drain systems

Question 10

Is the Ice protection system automatic?

Answer 10

Yes

Question 11

How is ice detected in flight?

Answer 11

2 Ice Detectors

(Vibrating sensor element changes frequency when ice is present. Once Ice is detected, sensor heats, ice melts and the cycle repeats after 5 minutes)

Question 12

What stage bleed is used for Anit-Ice?

Answer 12

10th High Stage Valve

Question 13

How is bleed air directed for Anti-Ice?

Answer 13

Engines:

• Onside Cowl

Wings:

• Onside Bleed

Question 14

What happens when a bleed source fails?

Answer 14

Crossbleed valve opens automatically

Question 15

How should the MCDU “ICING” be set for icing conditions on the ground?

Answer 15

ALL

Question 16

What does selecting “ALL” on the MCDU provide?

Question 17

If “ALL” is selcted on the ground, when

will the anti-ice system become automatic?

Answer 17

1700ft AGL or 2 mins after T/O

(whichever happens first)

Question 18

If “OFF” is selcted on the ground, when

will the anti-ice system become automatic?

Answer 18

1700ft AGL or 2 mins after T/O

(whichever happens first)

Question 19

How does losing a power source affect Windshield heating?

Answer 19

On Ground:

• Inhibited

In Flight:

• Left side heated only
• Right side heated when left side has failed

Question 20

What does the “TIMER” selection on the wiper switch do?

Answer 20

Activates associated wiper in 8-second intervals

Question 21

What happens is wiper is operated on dry windshield?

Answer 21

• Wiper stops
• Reset wiper by selecting “OFF”

Question 22

When do the smart probes heat?

Answer 22

When an engine is running

Question 23

Is there an Anti-ice test?

Answer 23

Yes

(maintenance performs this test)

Question 24

How should aircraft be configured for De-icing?

Answer 24

• Bleeds……………………….OFF
• Stab Trim…………………..Full Nose Down
• Flaps………………………….UP
• Engines and APU……..On or OFF (as required)