DOC AIRBUS | AMM A320FCheck for Actuator Stow Tube Clearance [IAE]
TASK 78-32-48-220-801-A
Check for Actuator Stow Tube Clearance
Stow tube is causing damage inside the fan cowl door.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 78-32-48-941-054-A ** ON A/C NOT FOR ALL
Subtask 78-32-48-220-050-A ** ON A/C NOT FOR ALL
Subtask 78-32-48-410-058-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:28:51 UTC
Check for Actuator Stow Tube Clearance
NOTE: This task is applicable to PRE SBN 70-0970 upper actuators. POST SBN 70-0970 units do not need to be check for clearance.
1. Reason for the JobStow tube is causing damage inside the fan cowl door.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-32-48-820-801-A | Adjustment/Test of the Thrust Reverser Stow Tube Clearance |
| SRM 542000 | |
Stow Tube Clearance and Shim LocationSubtask 78-32-48-941-054-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1 (2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the ENG section of the maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR 1 (2) pushbutton switch is off.
(b) Put WARNING NOTICE(S) to tell persons not to energize the FADEC 1 (2).
4. Procedure(1) On the center pedestal, on the ENG panel 115VU:
(a) Put WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1 (2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the ENG section of the maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR 1 (2) pushbutton switch is off.
(b) Put WARNING NOTICE(S) to tell persons not to energize the FADEC 1 (2).
Subtask 78-32-48-220-050-A ** ON A/C NOT FOR ALL
A. Check the gap dimension between the upper actuator stow tube and the inner surface of the fan cowl doors.
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-010).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position in the left side of the engine.
(3) Place a piece of clay with a 0.5 in. (12.70 mm) thick wall and 1.0 in. (25.40 mm) long around the actuator tube.
(4) Carefully close the fan cowl door (Ref. AMM TASK 71-13-00-410-010). Avoid loosing the clay.
(5) Carefully open the fan cowl door (Ref. AMM TASK 71-13-00-010-010). Avoid loosing the clay.
(6) Check for wear damage to the fan cowl doors. Use all the tests that are necessary to make sure that the type and extent of damaged are properly determined. Refer to SRM 542000 for fan cowl damage disposition.
(7) Measure the clay thickness. The clay thickness is the actual gap between the upper actuator stow tube and the inner surface of the fan cowl doors.
(8) If the gap is larger than or equal to 0.040 in. (1.02 mm), no additional work is required.
(9) Close the fan cowl door (Ref. AMM TASK 71-13-00-410-010).
(10) If the gap is smaller than 0.04 in. (1.02 mm), perform the adjustment of the thrust reverser stow tube clearance (Ref. AMM TASK 78-32-48-820-801).
5. Close-up(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-010).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position in the left side of the engine.
(3) Place a piece of clay with a 0.5 in. (12.70 mm) thick wall and 1.0 in. (25.40 mm) long around the actuator tube.
(4) Carefully close the fan cowl door (Ref. AMM TASK 71-13-00-410-010). Avoid loosing the clay.
(5) Carefully open the fan cowl door (Ref. AMM TASK 71-13-00-010-010). Avoid loosing the clay.
(6) Check for wear damage to the fan cowl doors. Use all the tests that are necessary to make sure that the type and extent of damaged are properly determined. Refer to SRM 542000 for fan cowl damage disposition.
(7) Measure the clay thickness. The clay thickness is the actual gap between the upper actuator stow tube and the inner surface of the fan cowl doors.
(8) If the gap is larger than or equal to 0.040 in. (1.02 mm), no additional work is required.
(9) Close the fan cowl door (Ref. AMM TASK 71-13-00-410-010).
(10) If the gap is smaller than 0.04 in. (1.02 mm), perform the adjustment of the thrust reverser stow tube clearance (Ref. AMM TASK 78-32-48-820-801).
Subtask 78-32-48-410-058-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) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).