Originally Posted by
flash8
Hi there
Could any kind folk point me in the direction of the 604 systems flow diagrams for the Ice Detector System? Does it have an aural warning? What are the normal/abnormals?
Many thanks!
flash
No aural warnings... from memory when the amber ICE message appears on the EICAS it means the system detected ice and it goes through a 60 second cycle where the probes heat up to melt the ice, cool down and then are ready to pick up new icing. If ice is detected again, the cycle repeats itself... the amber ice message remains ON until wing and cowl anti ice are manually selected ON and their respective green announciator lights come ON where the ice message becomes white (IIRC).
There are IIRC two abnormals where one of two ice detectors fail and where both fail...
ONE ICE DETECTOR FAILURE... indicated by Ice Detector 1 or 2 white advisory message.
Cowl anti ice select to ON.
Wing anti ice select to NORMAL.
ICE message (amber) remains ON or WING/COWL ON (green) message is OUT or WING L HEAT or WING R HEAT remains OUT...
If YES.... Thrust increase...
After thrust increase and if ICE message (amber) remains ON or WING/COWL ON (green) message is OUT or WING L HEAT or WING R HEAT remains OUT... Leave icing conditions.
If after wing and cowl anti ice are selected ON and the WING/COWL ON (green) message is ON then... No further action is required.
ICE DETECTOR AMBER message light ON (both detectors have failed)...
If icing conditions are present or anticipated... WING and Cowl Anti Ice ON and NORMAL.
If WING/COWL ON (green) message is ON... No further action.
If WING/COWL ON (green) message is OUT or WING L HEAT or WING R HEAT remains OUT...
Follow as above for the single detector failure procedure.