Subtask 78-37-51-010-057
 B. Get Access
 (1) Open the fan cowl doors (Ref. TASK 71-13-00-010-040): FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR

 (2) Put the access platform in position in the left side of engine.

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 C. Depressurization of the hydraulic reservoirs
 (1) For engine 1 depressurize the green hydraulic reservoir (Ref. TASK 29-14-00-614-001).

 (2) For engine 2 depressurize the yellow hydraulic reservoir (Ref. TASK 29-14-00-614-001).

 4. Procedure
_________ (Ref. Fig. 301/TASK 78-37-51-991-301) Subtask 78-37-51-020-054
 A. Removal of the Thrust Reverser Hydraulic Isolation Valve Filter
 (1) Put a drain can 1 USgal (4 l) below the filter. WARNING : YOU MUST REMOVE THE FILTER BOWL CAREFULLY BECAUSE IT IS

_______ FULL OF HYDRAULIC FLUID AND INJURY CAN OCCUR.

 (2) Remove the filter bowl (9), as follows:

 (a) Use a 1-1/4 inch (31.75 mm) open end wrench to loosen the filter bowl (9).

 (b) Turn the filter bowl counter-clockwise to remove it from the filter head (1).

 (3) Remove and discard the filter element (6) from the filter bowl (9).

 (4) Remove and discard the C-ring (5).

 (5) Pull on the element removal spring (4) to remove it from the shutoff diaphragm (2).

 (6) Remove and discard the packing (3) from the shutoff diaphragm (2). NOTE : The shutoff diaphragm (2) is only shown to indicate where the

____ packing (3) is located. You must not remove the shutoff diaphragm from the filter head.
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 Thrust Reverser Hydraulic Isolation Valve Filter
 Figure 301/TASK 78-37-51-991-301
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 (7) Turn the filter bowl (9) upside down and remove the B/V washer (7).

 CAUTION : DO NOT DAMAGE THE DPI OR FILTER BOWL WITH THE METAL TOOLS
_______ WHEN YOU REMOVE/INSTALL THE PACKING.
 (8) Remove the packing (8) from the Differential Pressure Indicator (DPI)
 (10) in the filter bowl, as follows:
 NOTE : For removal/installation of Differential Pressure Indicator
____ (DPI) (10) from/into the filter bowl (9), refer to Component Maintenance Manual (Ref. CMM 783155). Removal of DPI from filter bowl can ease in the removal/installation of packing (8).
 (a) Use a spatula to push the packing (8) out of its groove in the DPI.
 NOTE : Bend the end of the spatula approximately 45 degrees. This
____ will help push the packing out of its groove.
 (b) Use a second spatula to remove the packing (8) from the DPI. Discard the packing.
 NOTE : If the DPI must be replaced, the complete filter assembly
____ must be removed from the aircraft. A complete acceptance test procedure must be done when the DPI is replaced.
 (9) Remove the drain can.
 Subtask 78-37-51-420-054
 B. Installation of the Thrust Reverser Isolation Valve Hydraulic Filter
R (1) Put a new packing (3) in the seal groove of the shutoff diaphragm (2).
 (2) Install the element removal spring (4) in the shutoff diaphragm (2). Push the spring (4) into the groove of the shutoff diaphragm until the first coil is fully engaged.

 (3) Hold the filter bowl (9) with the open end at the top.

 CAUTION : DO NOT DAMAGE THE DPI OR FILTER BOWL WITH THE METAL TOOLS
_______ WHEN YOU REMOVE/INSTALL THE PACKING.
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R (4) Install a new packing (8) on the Differential Pressure Indicator (DPI) (10) as follows: (Ref. Fig. 302/TASK 78-37-51-991-302)
 (a) Use the packing installation tool AA-B847-6SE3 to install the packing (8). The installation tool has two pieces, the bullet and the push tube.

 (b) Lubricate the packing (8) and the installation tool bullet with thrust reverser hydraulic fluid.

 (c) put the packing (8) on the installation tool bullet.

 (d) Put the installation tool bullet into the filter bowl until it touches the top of the DPI.

 NOTE : The small end of the bullet should be up.
　
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