DOC AIRBUS | AMM A320FInstallation of the Thrust Reverser Blocker Door Fairing [PW11]
TASK 78-32-34-400-805-A
Installation of the Thrust Reverser Blocker Door Fairing
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 78-32-34-941-060-A ** ON A/C NOT FOR ALL
Subtask 78-32-34-410-057-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:33:01 UTC
Installation of the Thrust Reverser Blocker Door Fairing
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING:
WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.PU3-0031) | threadlocker |
| (Material No.PU3-0032) | cyanoacrylate adhesive |
| (Material No.PU4-0002) | epoxy primer, fluid resistant |
| (Material No.PU4-0002C) | base primer |
| (Material No.PU4-0002D) | base primer |
| (Material No.PU4-0002E) | base primer |
| (Material No.PU4-0004A) | curing solution, epoxy primer |
| (Material No.PU4-0005) | thinner |
| (Material No.PU4-0007) | converter |
| (Material No.PU4-0008) | thinner |
| (Material No.PU4-0009) | curing solution |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR, 461AL, 462AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | BOLT | AIPC 78-32-05-70-010 |
| 3 | BOLT | AIPC 78-32-05-70-020 |
| 4 | BOLTS | AIPC 78-32-05-70-030 |
| 1 | WASHERS | AIPC 78-32-05-70-080 |
| 3 | BOLT | AIPC 78-32-05-85-010 |
| 3 | BOLT | AIPC 78-32-05-85-020 |
| 4 | BOLTS | AIPC 78-32-05-85-030 |
| 1 | WASHERS | AIPC 78-32-05-85-080 |
| 3 | BOLT | AIPC 78-32-06-70-010 |
| 3 | BOLT | AIPC 78-32-06-70-020 |
| 4 | BOLTS | AIPC 78-32-06-70-030 |
| 1 | WASHERS | AIPC 78-32-06-70-080 |
| 3 | BOLT | AIPC 78-32-06-85-010 |
| 3 | BOLT | AIPC 78-32-06-85-020 |
| 4 | BOLTS | AIPC 78-32-06-85-030 |
| 1 | WASHERS | AIPC 78-32-06-85-080 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-860-833-A | Procedure to Prevent Engine Motoring |
| TASK 71-13-00-010-802-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-802-A | Closing of the Fan Cowl Doors |
| TASK 78-30-00-040-805-A | Deactivation of the Thrust Reverser System for Ground Maintenance |
| TASK 78-30-00-440-805-A | Reactivation of the Thrust Reverser System after Ground Maintenance |
| TASK 78-32-33-820-801-A | Adjustment of the Thrust Reverser Blocker Doors |
| TASK 78-36-00-010-802-A | Opening of the Thrust Reverser Cowl-Doors |
| TASK 78-36-00-410-802-A | Closing of the Thrust Reverser Cowl-Doors |
Thrust Reverser Blocker Door FairingSubtask 78-32-34-941-060-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
Subtask 78-32-34-010-065-A ** ON A/C NOT FOR ALL (1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
Subtask 78-32-34-040-059-A ** ON A/C NOT FOR ALL (1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
C. Deactivation of the Thrust Reverser System for Maintenance
Subtask 78-32-34-010-066-A ** ON A/C NOT FOR ALL WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805). D. Get Access
(1) Make sure that the applicable thrust-reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL or 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL or 462AR.
4. Procedure(1) Make sure that the applicable thrust-reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL or 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL or 462AR.
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 78-32-34-420-053-A ** ON A/C NOT FOR ALL A. Installation of the Thrust Reverser Blocker Door Fairing
(1) Removal of the protection covers
PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
(2) Install the upper blocker door fairing (2):
(b) Loosely install the upper blocker door fairing (2) on the translating sleeve structure with the five AIPC 78-32-05-70-030 BOLTS (4)AIPC 78-32-05-85-030 BOLTS (4)AIPC 78-32-06-70-030 BOLTS (4)AIPC 78-32-06-85-030 BOLTS (4), the AIPC 78-32-05-70-010 BOLT (3)AIPC 78-32-05-85-010 BOLT (3)AIPC 78-32-06-70-010 BOLT (3)AIPC 78-32-06-85-010 BOLT (3) and the 12 AIPC 78-32-05-70-080 WASHERS (1)AIPC 78-32-05-85-080 WASHERS (1).
1 Do not torque the bolts (4) and (3) at this time.
(c) Adjust the upper blocker door fairing (2) as follows:
1 Push the upper blocker door fairing (2) against the translating sleeve structure.
2 Measure and record the height between the upper blocker door fairing (2) and the inner bond panel of the translating sleeve structure.
3 Remove the fasteners and the upper blocker door fairing (2) from the translating sleeve structure.
a Make sure that you do not drop the washers into the structure of the translating sleeve.
4 Adjust the number of washers, if necessary, until the height between the upper blocker door fairing (2) and the inner bond panel of the translating sleeve structure is between 0.000 in. (0.000 mm) and 0.060 in. (1.524 mm).
b If the thickness of the washers is less than 0.032 in. (0.813 mm), use a one-grip-length shorter bolt (3) or (4) at the applicable fastener location.
(d) Mix thePU4-0002 epoxy primer, fluid resistant PU4-0004A curing solution, epoxy primer
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(f) Install the upper blocker door fairing (2) on the translating sleeve structure with the five bolts (4), bolt (3), washers (1) and washers that you adjusted in step 4.A.(2)(c)4_.
1 Wet-install the bolts (4) with thePU4-0002 epoxy primer, fluid resistant
a Do not apply thePU4-0002 epoxy primer, fluid resistant
1 TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
.
(h) TORQUE the five bolts (4) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN ).
(i) Remove the bolt (3) and apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread.
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(j) Install the bolt (3) on the upper blocker door fairing (2) and translating sleeve structure. Wet-install the bolt (3) with thePU4-0002 epoxy primer, fluid resistant
1 Make sure that you keep the washers behind the upper blocker door fairing (2) in position.
(k) TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN ).
END OF PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
(3) Install the upper blocker door fairing (6).
(b) Mix thePU4-0002 epoxy primer, fluid resistant PU4-0004A curing solution, epoxy primer
(c) Install the upper blocker door fairing (6) on the translating sleeve structure with the six bolts (7). Wet-install the bolts (7) with thePU4-0002 epoxy primer, fluid resistant
(d) TORQUE the six bolts (7) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN ).
END OF POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
(4) Install the lower blocker door fairing (5).
1 Do not torque the bolts (4) and (3) at this time.
(b) Adjust the lower blocker door fairing (5) as follows:
1 Push the lower blocker door fairing (5) against the translating sleeve structure.
2 Measure and record the height between the lower blocker door fairing (5) and the inner bond panel of the translating sleeve structure.
3 Remove the fasteners and the lower blocker door fairing (5) from the translating sleeve structure.
a Make sure that you do not drop the washers into the structure of the translating sleeve.
4 Adjust the number of washers as necessary until the height between the lower blocker door fairing (5) and the inner bond panel of the translating sleeve structure is between 0.000 in. (0.000 mm) and 0.060 in. (1.524 mm).
b If the thickness of the washers is less than 0.032 in. (0.813 mm), use a one-grip-length shorter bolt (3) or (4) at the applicable fastener location.
(c) Mix thePU4-0002 epoxy primer, fluid resistant PU4-0004A curing solution, epoxy primer
(d) Apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread of the five bolts (4).
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(e) Install the lower blocker door fairing (5) on the translating sleeve structure with the five bolts (4), bolt (3), washers (1) and washers that you adjusted in step 4.A.(4)(b)4_.
1 Wet-install the bolts (4) with thePU4-0002 epoxy primer, fluid resistant
a Do not apply thePU4-0002 epoxy primer, fluid resistant
1 TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN ).
(g) TORQUE the five bolts (4) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN ).
(h) Remove the bolt (3) and apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread.
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(i) Install the bolt (3) on the lower blocker door fairing (5) and translating sleeve structure. Wet-install the bolt (3) with thePU4-0002 epoxy primer, fluid resistant
1 Make sure that you keep the washers behind the lower blocker door fairing (5) in position.
(j) TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN ).
END OF PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
(5) Install the lower blocker door fairing (8).
PU4-0002 epoxy primer, fluid resistant PU4-0004A curing solution, epoxy primer
(b) Install the lower blocker door fairing (8) on the translating sleeve structure with the six bolts (7). Wet-install the bolts (7) with thePU4-0002 epoxy primer, fluid resistant
(c) TORQUE the six bolts (7) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN ).
END OF POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
(6) If necessary, adjust the applicable blocker doors (Ref. AMM TASK 78-32-33-820-801).
5. Close-up(1) Removal of the protection covers
CAUTION:
REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine. PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
(2) Install the upper blocker door fairing (2):
NOTE: This procedure is for the left thrust reverser upper blocker door fairing. The procedure for the right thrust reverser upper blocker door fairing is symmetrical.
(a) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position. (b) Loosely install the upper blocker door fairing (2) on the translating sleeve structure with the five AIPC 78-32-05-70-030 BOLTS (4)AIPC 78-32-05-85-030 BOLTS (4)AIPC 78-32-06-70-030 BOLTS (4)AIPC 78-32-06-85-030 BOLTS (4), the AIPC 78-32-05-70-010 BOLT (3)AIPC 78-32-05-85-010 BOLT (3)AIPC 78-32-06-70-010 BOLT (3)AIPC 78-32-06-85-010 BOLT (3) and the 12 AIPC 78-32-05-70-080 WASHERS (1)AIPC 78-32-05-85-080 WASHERS (1).
1 Do not torque the bolts (4) and (3) at this time.
(c) Adjust the upper blocker door fairing (2) as follows:
1 Push the upper blocker door fairing (2) against the translating sleeve structure.
2 Measure and record the height between the upper blocker door fairing (2) and the inner bond panel of the translating sleeve structure.
3 Remove the fasteners and the upper blocker door fairing (2) from the translating sleeve structure.
a Make sure that you do not drop the washers into the structure of the translating sleeve.
4 Adjust the number of washers, if necessary, until the height between the upper blocker door fairing (2) and the inner bond panel of the translating sleeve structure is between 0.000 in. (0.000 mm) and 0.060 in. (1.524 mm).
NOTE: You can use the NAS1149C0332R or the NAS1149C0363R washers as alternatives to the NAS1149C0316R washers, as necessary.
NOTE: You can use the washers with a maximum total thickness of 0.13 in. (3.30 mm) at one or more of the fastener locations.
a If the thickness of the washers is more than 0.098 in. (2.489 mm), use a one-grip-length longer bolt (3) or (4) at the applicable fastener location. b If the thickness of the washers is less than 0.032 in. (0.813 mm), use a one-grip-length shorter bolt (3) or (4) at the applicable fastener location.
(d) Mix the
NOTE: You can use the following as alternatives to the PU4-0002 epoxy primer, fluid resistant
(e) Apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread of the five bolts (4).- The base primer (Material No.PU4-0002C) ,
PU4-0004A curing solution, epoxy primer - The base primer (Material No.PU4-0002D) and the curing solution (Material No.PU4-0009) ,
- The base primer (Material No.PU4-0002E) and the converter (Material No.PU4-0007) .
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(f) Install the upper blocker door fairing (2) on the translating sleeve structure with the five bolts (4), bolt (3), washers (1) and washers that you adjusted in step 4.A.(2)(c)4_.
1 Wet-install the bolts (4) with the
a Do not apply the
NOTE: You can attach the washers together with the cyanoacrylate adhesive (Material No.PU3-0032) for an easier installation.
(g) Lightly push the upper blocker door fairing (2) against the center of the forward edge.1 TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
.(h) TORQUE the five bolts (4) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
. (i) Remove the bolt (3) and apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread.
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(j) Install the bolt (3) on the upper blocker door fairing (2) and translating sleeve structure. Wet-install the bolt (3) with the
1 Make sure that you keep the washers behind the upper blocker door fairing (2) in position.
(k) TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
. END OF PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
(3) Install the upper blocker door fairing (6).
NOTE: This procedure is for the left thrust reverser upper blocker door fairing. The procedure for the right thrust reverser upper blocker door fairing is symmetrical.
(a) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position. (b) Mix the
(c) Install the upper blocker door fairing (6) on the translating sleeve structure with the six bolts (7). Wet-install the bolts (7) with the
(d) TORQUE the six bolts (7) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )
. END OF POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
(4) Install the lower blocker door fairing (5).
NOTE: This procedure is for the left thrust reverser lower blocker door fairing. The procedure for the right thrust reverser lower blocker door fairing is symmetrical.
(a) Loosely install the lower blocker door fairing (5) on the translating sleeve structure with the five AIPC 78-32-05-70-030 BOLTS (4)AIPC 78-32-05-85-030 BOLTS (4)AIPC 78-32-06-70-030 BOLTS (4)AIPC 78-32-06-85-030 BOLTS (4), the AIPC 78-32-05-70-020 BOLT (3)AIPC 78-32-05-85-020 BOLT (3)AIPC 78-32-06-70-020 BOLT (3)AIPC 78-32-06-85-020 BOLT (3) and the 12 AIPC 78-32-06-70-080 WASHERS (1)AIPC 78-32-06-85-080 WASHERS (1).1 Do not torque the bolts (4) and (3) at this time.
(b) Adjust the lower blocker door fairing (5) as follows:
1 Push the lower blocker door fairing (5) against the translating sleeve structure.
2 Measure and record the height between the lower blocker door fairing (5) and the inner bond panel of the translating sleeve structure.
3 Remove the fasteners and the lower blocker door fairing (5) from the translating sleeve structure.
a Make sure that you do not drop the washers into the structure of the translating sleeve.
4 Adjust the number of washers as necessary until the height between the lower blocker door fairing (5) and the inner bond panel of the translating sleeve structure is between 0.000 in. (0.000 mm) and 0.060 in. (1.524 mm).
NOTE: You can use the NAS1149C0332R or the NAS1149C0363R washers as alternatives to the NAS1149C0316R washers, as necessary.
NOTE: You can use the washers with a maximum total thickness of 0.13 in. (3.30 mm) at one or more of the fastener locations.
a If the thickness of the washers is more than 0.098 in. (2.489 mm), use a one-grip-length longer bolt (3) or (4) at the applicable fastener location. b If the thickness of the washers is less than 0.032 in. (0.813 mm), use a one-grip-length shorter bolt (3) or (4) at the applicable fastener location.
(c) Mix the
(d) Apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread of the five bolts (4).
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(e) Install the lower blocker door fairing (5) on the translating sleeve structure with the five bolts (4), bolt (3), washers (1) and washers that you adjusted in step 4.A.(4)(b)4_.
1 Wet-install the bolts (4) with the
a Do not apply the
NOTE: You can attach the washers together with the cyanoacrylate adhesive (Material No.PU3-0032) for an easier installation.
(f) Lightly push the lower blocker door fairing (5) against the center of the forward edge.1 TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
.(g) TORQUE the five bolts (4) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
. (h) Remove the bolt (3) and apply a bead of the threadlocker (Material No.PU3-0031) to the threads adjacent to the first thread.
1 Do not apply the threadlocker (Material No.PU3-0031) on the first thread.
(i) Install the bolt (3) on the lower blocker door fairing (5) and translating sleeve structure. Wet-install the bolt (3) with the
1 Make sure that you keep the washers behind the lower blocker door fairing (5) in position.
(j) TORQUE the bolt (3) to between 35 and 27 lbf.in (0.40 and 0.31 m.daN )
. END OF PRE SB GRAA320NEO-A-78-30-0025-00001-930A-D
POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
(5) Install the lower blocker door fairing (8).
NOTE: This procedure is for the left thrust reverser lower blocker door fairing. The procedure for the right thrust reverser lower blocker door fairing is symmetrical.
(a) Mix the (b) Install the lower blocker door fairing (8) on the translating sleeve structure with the six bolts (7). Wet-install the bolts (7) with the
(c) TORQUE the six bolts (7) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )
. END OF POST SB GRAA320NEO-A-78-30-0025-00001-930A-D
(6) If necessary, adjust the applicable blocker doors (Ref. AMM TASK 78-32-33-820-801).
Subtask 78-32-34-410-057-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL or 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL or 462AR.
Subtask 78-32-34-440-054-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the applicable thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL or 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL or 462AR.
B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 78-32-34-410-058-A ** ON A/C NOT FOR ALL