Probe Heat Computer (PHC)
Figure 401/TASK 30-31-34-991-002
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(3)
Remove the screws (2) and the washers (1).
(4)
Remove the PHC (3).
TASK 30-31-34-400-002
Installation of the Probe Heat Computer (PHC) (6DA1,6DA2,6DA3)
CAUTION : MAKE SURE THAT WHEN THE C/B 2DA1(2,3) IS OPEN, THE C/B'S 1DA1(2),
_______ 3DA1(2,3), 4DA1(2,3), 5DA1(2,3) ARE ALSO OPEN. THIS PREVENTS DAMAGE TO THE TAT AND THE PITOT PROBES.
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific access platform 2.5 m (8 ft. 2 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
30-31-00-710-001 Operational Test of the Probe Ice Protection 30-31-34-991-002 Fig. 401
3. Job Set-up__________
Subtask 30-31-34-865-052
A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
R R R R R R R -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 6DA1 49VU ANTI ICE/PROBES/AOA/1 4DA1 D04 49VU ANTI ICE/PROBES/PHC/1 2DA1 D03 49VU ANTI ICE/PROBES/PITOT/1 3DA1 D02 122VU ANTI ICE/PROBES/1/STATIC 5DA1 Z13 122VU ANTI ICE/PROBES/1/TAT 1DA1 Z12 FOR 6DA2 122VU ANTI ICE/PROBES/2/TAT 1DA2 Y15 122VU ANTI ICE/PROBES/2/PITOT 3DA2 Y14 122VU ANTI ICE/PROBES/2/AOA 4DA2 Y13 122VU ANTI ICE/PROBES/2/PHC 2DA2 Y12 122VU ANTI ICE/PROBES/2/STATIC 5DA2 Y11 FOR 6DA3 122VU ANTI ICE/PROBES/PHC/3 2DA3 Y16 122VU ANTI ICE/PROBES/3/PITOT 3DA3 Z16 122VU ANTI ICE/PROBES/3/AOA 4DA3 Z15 122VU ANTI ICE/PROBES/3/STATIC 5DA3 Z14
Subtask 30-31-34-010-051
B. Make sure that the access platform is in position.
(1) Make sure that the access door 811 is open.
4. Procedure_________
(Ref. Fig. 401/TASK 30-31-34-991-002)
Subtask 30-31-34-420-050
A. Installation of the PHC
(1) Install the PHC (3).
(2) Install the screws (2) and the washers (1).
(3) Tighten the screws (2).
(4) Remove the blanking caps from the electrical connectors.
(5) Connect the electrical connector (4). Subtask 30-31-34-865-053
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): FOR 6DA1 1DA1, 2DA1, 3DA1, 4DA1, 5DA1 FOR 6DA2 1DA2, 2DA2, 3DA2, 4DA2, 5DA2 FOR 6DA3 2DA3, 3DA3, 4DA3, 5DA3
Subtask 30-31-34-710-050
C. Do an operational test of the probe ice protection system (Ref. TASK 30-31-00-710-001).
5. Close-up
________ Subtask 30-31-34-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access door 811.
(3)
Remove the access platform(s).
WINDSHIELD ANTI-ICING AND DEFOGGING - DESCRIPTION AND OPERATION
_______________________________________________________________
1. General
_______ R The anti-icing and defogging system of the windshield keeps a clear R visibility through the windshield and windows in icing or foggy conditions. R This objective is achieved by electrical heating of the windshield and R windows. R The system is automatically started at engine start-up. A pushbutton switch R also controls operation of the system (pushbutton switch in ON R configuration). R The system is made up of two independent sub-systems, left and right. R Each sub-system controls heating of the windshield and windows located on R the same side with respect to the aircraft centerline. Each sub-system R includes: R - one windshield, R - two windows:
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