(2)
Put the safety barriers in position.
(3)
Put the warning notice(s) in position to tell persons not to pressurize the Blue hydraulic system:
-in the cockpit on the hydraulic section 40VU of the overhead panel, - on the ground service panel of the Blue hydraulic system.
(4)
Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration. (Ref. TASK 29-00-00-864-001).
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(5) Depressurize the reservoir of the Blue hydraulic system (Ref. TASK 29-14-00-614-001).
WARNING : MAKE SURE THAT THE RAT TRAVEL RANGE IS CLEAR BEFORE YOU
_______
EXTEND/RETRACT THE RAT.
(6)
Extend the Ram Air Turbine (RAT) (Ref. TASK 29-22-00-869-005). Subtask 29-22-00-865-115
B.
Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
49VU HYD/RAT/CTL 2801GE D14 106VU CSM/G /EV/MAN/SPLY 6XE B04 121VU HYDRAULIC/RAT/SPLY/EXTN/SOL1 2803GE P33
4. Procedure
_________
(Ref. Fig. 512/TASK 29-22-00-991-026) Subtask 29-22-00-280-053
A. Functional Test of the RAT De-icing Device
(1)
Attach the TESTER - DE-ICING, RAT (7) in front of the RAT hub (8).
(2)
Turn the TESTER - DE-ICING, RAT (7) to align the chambers with the iron filings with the magnets on the inside of the RAT hub (8).
(3)
Make sure that the iron filings are aligned with the magnetic fields of all ten magnets.
(4)
If the iron filings in one or more chambers are not aligned with the related magnetic field, replace the RAT (Ref. TASK 29-22-51-000-010) and (Ref. TASK 29-22-51-400-010).
NOTE : You can identify a defective magnet as follows:
____
-The iron filings stay at the lower side of the chamber while you align the TESTER - DE-ICING, RAT with the magnets.
(5)
Remove the bolts (3), the washers (2) and the cover plate (1).
(6)
Put a hexagonal recess type wrench, size 0.250 in. (5) into the magnet stator shaft (6) at the rear of the RAT gearbox housing (4).
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RAT De-icing Device Test
Figure 512/TASK 29-22-00-991-026
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(7)
Turn the magnet stator shaft (6) approximately 36 degrees in clockwise and counterclockwise direction.
(8)
Make sure that the iron filings follow the magnetic fields while you turn the magnet stator shaft (6).
(9)
If the iron filings do not follow the magnetic fields, replace the RAT (Ref. TASK 29-22-51-000-010) and (Ref. TASK 29-22-51-400-010).
(10)
Remove the hexagonal recess type wrench (5) from the magnet stator shaft (6).
(11)
Remove the TESTER - DE-ICING, RAT (7) from the RAT hub (8).
(12)
Install the cover plate (1), the washers (2) and the bolts (3).
(13)
TORQUE the bolts (3) to between 86 and 95 lbf.in (0.97 and 1.07 m.daN).
5. Close-up
________ Subtask 29-22-00-865-116
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 2801GE, 2803GE, 6XE
Subtask 29-22-00-860-114
B. Aircraft Maintenance Configuration
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Pressurize the reservoir of the Blue hydraulic system (Ref. TASK 29-14-00-614-002).
(3)
Pressurize the Blue hydraulic system (Ref. TASK 29-10-00-863-003). WARNING : MAKE SURE THAT THE RAT TRAVEL RANGE IS CLEAR BEFORE YOU
_______
EXTEND/RETRACT THE RAT.
(4)
Retract the RAT (Ref. TASK 29-22-00-869-006).
(5)
Depressurize the Blue hydraulic system (Ref. TASK 29-10-00-864-003).
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