(3)
 Remove the warning notice(s).

 Subtask 30-21-51-865-051
 C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU ANTI ICE/ENG/2 1DN2 W10 122VU ANTI ICE/ENG/1 1DN1 X10
 Subtask 30-21-51-862-053
 D. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 PROBE ICE PROTECTION - DESCRIPTION AND OPERATION
________________________________________________
 1. General
_______ R The air data system (Ref. 34-10-00) includes several probes and sensors R (pitot and static probes, angle of attack and total air temperature (TAT) R sensors) located on the fuselage in zones particularly exposed to ice. R An electrical heating system integral with each probe operates permanently R to maintain probe efficiency. Permanent monitoring of the probes is ensured. R Warning is provided to indicate heating malfunction of each probe. R The air data system comprises three independent detection channels: R - 1 (Captain), R - 2 (First Officer), R - 3 (Standby).
 2. Component Location
__________________ R (Ref. Fig. 001)
R -------------------------------------------------------------------------------R FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA R | | | | DOOR | REF. R -------------------------------------------------------------------------------
R 6DA1 PHC-1 R 6DA2 PHC-2 R 6DA3 PHC-3 R 7DA1 PROBE-L STATIC, 1 R 7DA2 PROBE-L STATIC, 2 R 7DA3 PROBE-L STATIC, 3 R 8DA1 PROBE-R STATIC, 1 R 8DA2 PROBE-R STATIC, 2 R 8DA3 PROBE-R STATIC, 3 R 9DA1 PROBE-PITOT, 1 R 9DA2 PROBE-PITOT, 2 R 9DA3 PROBE-PITOT, 3
3. System Description
__________________
R A. Probe Ice Protection 121 831 30-31-34 122 831 30-31-34 121 831 30-31-34 127 824 34-11-16 127 824 34-11-16 121 811 34-11-16 128 824 34-11-16 128 824 34-11-16 122 811 34-11-16 125 812 34-11-15 126 822 34-11-15 125 812 34-11-15
R Electrical heating of the probes prevents ice accretion on the probes of
R the air data system:
R - pitot probes,
R - static probes,
R - angle of attack sensors,
R - TAT sensors.
R The TAT sensors are not heated on the ground.
R The ice protection system of the probes is arranged in three independent
R channels (1, 2 and 3).

 Probe Ice Protection - Component Location
 Figure 001
 1EFF :  ALL  1  30-31-00 Page 2 
1  1  Feb 01/98
 1  1
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 B. PHC
 (1) The PHC controls and monitors heating of the probes given below:
 - one pitot probe,
 - one AOA sensor,
 - two static probes,
 - one TAT sensor.
 (2) There are three PHCs, one per probe channel:
 - PHC 1,
 - PHC 2,
 - PHC 3 (channel 3 does not include the TAT sensor).
 (3) Electrical connections
 (Ref. Fig. 002, 003, 004) 
R  4. Power Supply____________ 
R  (Ref. Fig. 002, 003, 004) 
R  The supply and protection of the components and functions is given below: 
R  -------------------------------------------------------------------------------
R  |COMPONENT/FUNCTION | CIRCUIT | BUS | 
R  | | BREAKER | | 
R  |-------------------------------------------------|--------------|------------| 
R  | | Supply of TAT sensor heating | 1DA1 | 101XP-A | 
R  | |----------------------------------|--------------|------------| 
R  | | Supply of PHC | 2DA1 | 401PP | 
R  | |----------------------------------|--------------|------------| 
R  | PROBES | Supply of pitot probe heating | 3DA1 | 401XP-B | 
R  | 1 |----------------------------------|--------------|------------| 
R  | | Supply of angle of attack sensor | 4DA1 | 801XP | 
R  | | heating | | | 
R  | |----------------------------------|--------------|------------| 
R  | | Supply of static probe heating | 5DA1 | 101PP | 
R  |-------------------------------------------------|--------------|------------| 
R  | | Supply of TAT sensor heating | 1DA2 | 202XP-C | 
R  | |----------------------------------|--------------|------------| 
R  | | Supply of PHC | 2DA2 | 206PP | 
R  | |----------------------------------|--------------|------------| 
R  | PROBES | Supply of pitot probe heating | 3DA2 | 202XP-B | 
　
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