(a)
 FOR 1000EM1
 451AL, 452AR.

 (b)
 FOR 1000EM2
 461AL, 462AR.

 4. Procedure
_________ Subtask 54-57-22-020-050
 A. Removal of the Apron Assemblies on the Left Pylon
 (1)
 Removal of the hats-section assembly (41) and (44).
 (Ref. Fig. 401/TASK 54-57-22-991-004)

 (a)
 Remove the bolts (43),(45) and the washers (42),(46).

 (b)
 Remove the seal and retainer assemblies (41) and (44).

 (2)
 Removal of the aft apron assemblies (51) and (64).
 (Ref. Fig. 402/TASK 54-57-22-991-005)

 (a)
 Remove the bolts (62) the washers (63), the aft apron assemblies

 (51) and (64).

 (b)
 Remove the bolts (54) and the washers (55).

 (c)
 Remove the bolts (59) and the washers (58).

 (d)
 Remove the brackets (56) and (61) from the forward aprons.

 (e)
 Remove the bolts (53) and the washers (52).

 (f)
 Remove the aft apron (51) and (61).

 (g)
 Remove the forward aprons (57) and (60). NOTE : Do the same procedure for the removal of the right pylon.

 Seal and Retainer Assembly
 Figure 401/TASK 54-57-22-991-004
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 Apron Assembly
 Figure 402/TASK 54-57-22-991-005
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____ TASK 54-57-22-400-001 Installation of the Apron Assemblies

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
78-36-00-410-040 Closing of the Thrust Reverser Doors 54-57-22-991-004 Fig. 401 54-57-22-991-005 Fig. 402
 3. Job Set-up
__________ Subtask 54-57-22-941-051
 A. Aircraft Maintenance Configuration
 (1) Make sure that the access platform and the warning notices are in position.
 4. Procedure
_________ Subtask 54-57-22-420-050
 A. Installation of the Apron Assemblies on the Left Pylon
 (Ref. Fig. 402/TASK 54-57-22-991-005)

 (1)
 Install the aft aprons (51) and (64).

 (a)
 Position the forward aprons (57) and (60).

 (b)
 Position the aft aprons (51) and (64).

 (c)
 Install the washers (52) and the bolts (53).

 (d)
 Tighten the bolts (62).

 (e)
 Position the brackets (56) and (61) on the forward aprons (57) and (60).

 (f)
 Install the washer (58) and the bolt (59).

 (g)
 Tighten the bolt (59).

 (h)
 Install the washers (55) and the bolts (54).

 (i)
 Tighten the bolts (54).

 (2)
 Installation of the seal and retainer assemblies (41) and (44). (Ref. Fig. 401/TASK 54-57-22-991-004)

 (a)
 Position the seal and retainer assemblies (41) and (44) on the pylon structure.

 (b)
 Install the washers (42),(46) and the bolts (43),(45).

 (c)
 Tighten the bolts (43),(45). NOTE : Do the same procedure for the installation of the right

____
 pylon.

 5. Close-up
________ Subtask 54-57-22-410-050
 A. Closing of the Thrust Reverser Doors.
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close of the thrust reverser doors (Ref. TASK 78-36-00-410-040). FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR.

 Subtask 54-57-22-942-050
 B. Close Access
 (1)
 Remove the access platform(s).

 (2)
 Remove the warning notice(s).

 (3)
 Make sure that the work area is clean and clear of tool(s) and other

 items.