Anti Ice Rain Flashcards
What are the components of the rain removal system?
Windshield wipers and hydrophobic coating on the windows
Which external probes, vanes, ports, antennas, etc. are electrically heated?
PITOT, ELEV PITOT, ALPHA VANE, and TEMP PROBE Each has an associated light.
Which Flight Deck windows are heated?
Flight Deck Windows 1 and 2 (Captain and First Officer)
What causes the ON (green) lights and OVERHEAT (amber) lights to illuminate and extinguish?
a. ON: power is being applied to the respective window. Extinguish if switch OFF, system failure, a
window overheat.
b. OVERHEAT: window temperature exceeds the predetermined level, Extinguish when cooled.
What does the Engine Anti-Ice System protect from icing?
Engine cowl lip
How is heat provided for engine anti-ice?
5th and 9th stage engine bleed air prior to Bleed shutoff valve
How does the system operate?
Individual ENG ANTI-ICE switches.
What is the logic associated with ENG ANT-ICE positioned to ON?
TAI (green/amber) is displayed above N1 indication on Engine Display, sets stall warning logic for icing
conditions whilst on
What does a COWL ANTI-ICE (amber) light indicate?
Excessive pressure (greater than 65 psi) in the duct leading from the Cowl Anti-Ice Valve to the cowl
lip
When does it illuminate/extinguish?
Excessive pressure (greater than 65 psi)
What does a COWL VALVE OPEN bright blue light indicate?
In transit or disagrees with the ENG ANTI-ICE switch position
Dim blue?
Valve is open with the switch ON
Extinguished?
valve is closed and the switch is OFF
What does an amber TAI indication above the engine N1 gauge mean?
Cowl Anti-Ice Valve fails to move to commanded position
A green TAI?
Anti-Ice Valve is open,
What does the Wing Anti-Ice System protect from icing?
3 inboard leading edge slats
How is heat provided for wing anti-ice?
Bleed Air, controlled by Wing A/Ice sw.
What is the logic associated with WING ANT-ICE positioned to ON? Off?
a. Ground, opens valves if: - thrust on both engines is below takeoff setting and no duct
overtemperature
b. Flight: Opens if no duct overheat and sets stall warning logic for icing conditions for remainder of
flight
. How is wing anti-ice operation/logic different for ground ops vs in-flight?
Gnd: Lower overheat threshold, switches off when airborne
What does a Wing Anti-Ice L or R VALVE OPEN bright blue light indicate?
Valve In transit or disagree
Dim blue?
Valve open switch on (agrees)
Extinguished
Valve closed switch off (agrees)
With the PROBE HEAT switches in AUTO, under what conditions will heat be applied to probes?
After 1st Engine start
What do CAPT PITOT, L/R ELEV PITOT, L/R ALPHA VANE, TEMP PROBE, and AUX PITOT amber lights indicate?
Electrical power not provided to respective sensor
