Ice Detection/Protection Systems Flashcards
What source are used for Anit-icing and De-icing?
- Bleed Air Heat
- Electrical Heat
What uses Bleed air for Anti-ice?
- Engine Cowl
- 3 Outboard Slats
What uses electric heat for Anti-Ice?
- Pitot-static System
- Windshields
- Water Lines
- Pressurization static port
If an engine fails, does the opposite wing and engine receive ice protection?
Yes
- Crossbleed valve opens to provide bleed air to both wings
- The failed engine does not receive engine cowl bleed air
How many ice detectors are required?
One
(There are two for redundancy)
How long does the system remain active
after Icing is no longer detected?
5 minutes
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?
Yes
>1700ft
or
2 minutes after T/O
(whichever happens first)
Can the APU provide bleed air for Anti-ice?
No
What is protected from Ice and Rain?
- Engine Cowl
- 3 Outboard slats
- Smart Probes
- Windshields
- Waste and Water drain systems
Is the Ice protection system automatic?
Yes
How is ice detected in flight?
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)
What stage bleed is used for Anit-Ice?
10th High Stage Valve
How is bleed air directed for Anti-Ice?
Engines:
- Onside Cowl
Wings:
- Onside Bleed
What happens when a bleed source fails?
Crossbleed valve opens automatically
How should the MCDU “ICING” be set for icing conditions on the ground?
ALL
What does selecting “ALL” on the MCDU provide?
If “ALL” is selcted on the ground, when
will the anti-ice system become automatic?
1700ft AGL or 2 mins after T/O
(whichever happens first)
If “OFF” is selcted on the ground, when
will the anti-ice system become automatic?
1700ft AGL or 2 mins after T/O
(whichever happens first)
How does losing a power source affect Windshield heating?
On Ground:
- Inhibited
In Flight:
- Left side heated only
- Right side heated when left side has failed
What does the “TIMER” selection on the wiper switch do?
Activates associated wiper in 8-second intervals
What happens is wiper is operated on dry windshield?
- Wiper stops
- Reset wiper by selecting “OFF”
When do the smart probes heat?
When an engine is running
Is there an Anti-ice test?
Yes
(maintenance performs this test)
How should aircraft be configured for De-icing?
- Bleeds……………………….OFF
- Stab Trim…………………..Full Nose Down
- Flaps………………………….UP
- Engines and APU……..On or OFF (as required)
