Ice & Rain Protection Flashcards
How is the Airframe De-ice System affected by the position of the Air Bleed Switches?
Not affected
How is Bleed Air normally distributed to the Airframe De-ice system in flight?
Passes through the P2.7 check valve and then bypasses to Precooler to the Precooler Secondary Core before going to the De-ice system
What is the normal Airframe De-ice System Pressure?
18 psi +/-3
What else is the Airframe De-ice System Air used for?
Seals on the Airstair and rear baggage doors
What is the Timing Cycle Sequence of the De-ice Boots in Fast Mode?
Each of the 6 sections for 6 seconds each and then a dwell time of 24 seconds
When do we use the De-ice boots in SLOW mode?
Never
How is the PROP Deice Timing Cycle Sequence controlled?
Timer Monitor Control Units (TMCUs) select the sequence based on the temperature.
If operating the Airframe De-ice system in Manual mode, how long should each position be held?
6 seconds, mirroring the automatic cycle
What is the power supply to the Ice Detectors?
115V AC
What does an Amber Flashing ICE DETECTED message on the ED mean?
ICE DETECTED, but REF SPEEDS switch is not at INCR
What part of the Propeller Blade is protected by a heated mat?
70% of the inner part of the leading edge
Under what conditions will the Propeller De-ice System schedule heat to the Mats?
PROP heat selector is at ON, TAT 400
Where is Total Air Temperature displayed?
Not displayed.
What is the minimum Oil Temperature required to ensure Engine Air Inlet Ice Protection?
65 deg C
What conditions are required for the Engine Intake Adaptor Heaters to activate?
Engine switch lights open, Engine oil pressure >44 psi, AC Busses Energised, OAT (Fuselage Skin temp)
