R Ice Detection System - Interface
R Figure 008
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R Lighted Icing Indicator Figure 009
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R **ON A/C 401-499,
R R R R R R R R R R R R R R R R R R (Ref. Fig. 009, 010) The ice detection system comprises: - two ENG 1 and ENG 2 pushbutton switches located on the ANTI ICE section of the overhead control and indicating panel 25VU, - one ANTI ICE/WING pushbutton switch located on the ANTI ICE section of the overhead control and indicating panel 25VU, - two ice detectors, - one ICE IND & STBY COMPASS switch located on the INT LT section of the panel 25VU, - a lighted icing indicator located on the center panel retainer between the two windshield panels.
R A. ANTI ICE/ENG 1 and ENG 2 Pushbutton Switches
R R R R R (1) Description These pushbutton switches control their related engine-air-intake anti ice valve.
R R (a) The blue ON legend comes on when you press the pushbutton switch (ON).
R R (b) The amber FAULT legend comes on when the pushbutton switch position and the anti ice valve position do not agree.
R R R R R R R R R R R (2) Ice detection When icing conditions are detected: - a warning message is displayed on the upper ECAM display unit, - the MASTER CAUT light comes on, - the single chime is activated, advising to select the ANTI ICE/ENG 1(2) pushbutton switch ON.
R Ice Detector
R Figure 010
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R R R R R R R R R (3) Action / result When the ANTI ICE/ ENG 1(2) pushbutton switch is selected ON, and no more icing conditions are detected, the MEMO message ENG A. ICE begins to pulse, advising to release the ANTI ICE/ENG 1(2) pushbutton switches. Then the ON legend(s) of the pushbutton switch(es) and the MEMO message go off.
R B. ANTI ICE/WING Pushbutton Switch
R R R R R (1) Description A single pushbutton switch controls both wing anti ice control valves.
R R (a) The blue ON light comes on when you press the pushbutton switch (ON).
R R (b) The amber FAULT legend comes on when the pushbutton switch position and the anti ice control valve position do not agree.
R R R R R R R R R R R R R (2) Ice detection When severe icing conditions are detected (7 elementary ice detections): - a warning message is displayed on the upper ECAM display unit, - the MASTER CAUT light comes on, - the single chime is activated, advising to select the ANTI ICE/WING pushbutton switch ON.
R R R R R R R R R (3) Action /result When the ANTI ICE/WING pushbutton switch is selected ON, and no more icing conditions are detected, the two MEMO messages begin to pulse: - WING A. ICE, - and ENG A. ICE
R advising to release the:
R
R - ANTI ICE/ENG 1(2) pushbutton switch,
R
R - and the ANTI ICE/WING pushbutton switch.
R
R Then the ON legends of the pushbutton switches and the MEMO messages
R go off.
R C. Ice Detector
R
R The ice detector is a probe-type ice detector which is designed to detect
R natural icing conditions in flight.
R
R The sensing element and the electronic part are grouped in the same unit.
R
R The ice detector has two discrete output signals:
R
R - ICE
R
R - and SEVERITY,
R
R each calibrated to activate at a different level of ice accretion.
R
R The ice detector also provides a discrete output signal (FAULT) for
R remote display of an ice detector failure.
R (1) Strut assembly and sensing element
R
R The probe consists of a magnetostrictive nickel alloy tube of
R approximately 0.25 in. (6.35 mm) diameter with an exposed length of 1
R in. (25.4 mm).
R In addition, the strut also contains the drive and feedback coils and
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