DOC AIRBUS | AMM A320FInstallation of the Pneumatic Sense Line
TASK 20-23-11-911-003-A
Installation of the Pneumatic Sense Line
1. Reason for the Job
To give maintenance practices to install pneumatic sense lines related to the air conditioning system (ATA 21).
To install sense lines in engine nacelles related to the bleed air system, (ATA 36), obey the instructions given in ATA 36-11-XX.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 20-23-11-941-055-A
Subtask 20-23-11-420-055-A
Subtask 20-23-11-410-053-A
[Rev.10 from 2021]
2026.03.31 22:59:21 UTC
Installation of the Pneumatic Sense Line
1. Reason for the Job
To give maintenance practices to install pneumatic sense lines related to the air conditioning system (ATA 21).
To install sense lines in engine nacelles related to the bleed air system, (ATA 36), obey the instructions given in ATA 36-11-XX.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.03LBB1) | Grease-Thread Anti-seize Graphited and Petrolatum - |
| (Material No.06CMD9) | Silicone Adhesive Sealant-General Purpose One part legacy |
| (Material No.14RAD1) | Cord-- Synthetic fiber Dia: 2.5 mm - |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 20-21-11-911-001-A | Tightening Torques for Standard Threaded Fasteners |
| TASK 20-21-12-911-001-A | Tightening Torques for Pipe Unions (not for OXYGEN Unions) |
| TASK 20-23-22-910-001-A | Marking of the Unions after Application of Standard or Specific Tightening Torque |
Minimum Clearance of the Pneumatic Sense LinesSubtask 20-23-11-941-055-A
A. Safety Precautions
(1) Put a WARNING NOTICE(S) in position to tell persons not to operate the systems in the area related to the installation of the sense line.
Subtask 20-23-11-917-093-A (1) Put a WARNING NOTICE(S) in position to tell persons not to operate the systems in the area related to the installation of the sense line.
B. General
(2) Make sure that all the items of equipment are installed and that it will not be necessary to remove the sense line subsequently.
(3) Make sure that the area is clean and in the correct condition to prevent contamination of the sense line when you remove the caps.
4. ProcedureWARNING:
MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
CAUTION:
WHEN DUST CAPS ARE USED FOR THE PROTECTION OF OPEN LINES AGAINST CONTAMINATION, ALWAYS BE SURE TO INSTALL THE CAPS AROUND THE TUBE ENDS AND NOT IN THE TUBE ENDS. THERE CAN BE BLOCKAGE OF THE FLOW THROUGH THE TUBES IF THESE TUBES ARE INSTALLED ACCIDENTALLY WITH DUST CAPS IN THE TUBE ENDS.
(1) When you take the tubes, you must move them carefully to prevent impacts, distortion and scratches. (2) Make sure that all the items of equipment are installed and that it will not be necessary to remove the sense line subsequently.
(3) Make sure that the area is clean and in the correct condition to prevent contamination of the sense line when you remove the caps.
Subtask 20-23-11-420-055-A
A. Installation of the Sense Line
(1) Make sure that you have a minimum distance between the pipe and the parts that can move or not and the other pipes.
1 Wind a spiral strip NSA849000 around the pipe.
2 Install a cable tie NSA935401 at each end of the spiral strip.
(b) If necessary, install lacing tape NSA8420 on the tube.
1 Attach the lines with lacing tape14RAD1 Cord-- Synthetic fiber Dia: 2.5 mm -
2 Complete the lacing with a reef knot. Tighten the knot.
3 Apply Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) on the knot and the ends of the lacing tape.
(2) Make sure that the parts you assemble are clean and free of contamination.
(3) Make sure that the tube and fitting are not damaged.
(a) Examine the threads of the fittings.
(b) Examine the sealing surfaces.
(c) Examine the tube for scratches, nicks, deformation, ...
(5) Put the tube in position and make sure that:
(7) Align the tube and the fitting and engage tube end.
(9) Use Grease-Thread Anti-seize Graphited and Petrolatum - (Material No.03LBB1) to lubricate the male thread and the rear side of the sleeve.
(11) TORQUE the connection to the applicable value (Ref. AMM TASK 20-21-12-911-001).
Subtask 20-23-11-710-050-A (1) Make sure that you have a minimum distance between the pipe and the parts that can move or not and the other pipes.
NOTE: If a maintenance procedure gives a different minimum distance, you must obey this distance.
NOTE: To measure the minimum distance between a pipe and a part that can move, you must measure the distance in a condition where the movement decreases the distance to its smallest value.
(a) If necessary, install a spiral strip. 1 Wind a spiral strip NSA849000 around the pipe.
2 Install a cable tie NSA935401 at each end of the spiral strip.
(b) If necessary, install lacing tape NSA8420 on the tube.
1 Attach the lines with lacing tape
2 Complete the lacing with a reef knot. Tighten the knot.
3 Apply Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) on the knot and the ends of the lacing tape.
(2) Make sure that the parts you assemble are clean and free of contamination.
(3) Make sure that the tube and fitting are not damaged.
(a) Examine the threads of the fittings.
(b) Examine the sealing surfaces.
(c) Examine the tube for scratches, nicks, deformation, ...
NOTE: Reject all parts that show signs of damage.
(4) Install the clamp blocks on the tube. (5) Put the tube in position and make sure that:
- The pipe you install is not too short or too long
- You can install the pipe in position without too much force on the clamp blocks.
(7) Align the tube and the fitting and engage tube end.
CAUTION:
MAKE SURE YOU DO NOT TWIST THE TUBES WHEN YOU INSTALL THEM. IF YOU TWIST THE TUBES, YOU CAN PUT A LOAD ON THEM WHICH CAN DAMAGE THEM.
CAUTION:
DO NOT BEND THE TUBE WHEN YOU INSTALL IT. IF THE TUBE IS BENT IT CAN BE DAMAGED.
(8) Tighten the attachment bolts of the clamp blocks with your hand only, sufficiently to make sure that the pipes do not fall. (9) Use Grease-Thread Anti-seize Graphited and Petrolatum - (Material No.03LBB1) to lubricate the male thread and the rear side of the sleeve.
CAUTION:
APPLY ONLY A THIN LAYER OF GREASE TO THE MALE THREAD AND THE REAR SIDE OF THE SLEEVE AND REMOVE THE UNWANTED GREASE. IF YOU USE TOO MUCH GREASE, THERE IS A RISK THAT THE GREASE WILL GO INTO THE COMPONENT AND CAUSE CONTAMINATION.
(10) Engage the sleeve in the union, turn the first thread of the nut with your hand and lubricate the remaining thread on the union with Grease-Thread Anti-seize Graphited and Petrolatum - (Material No.03LBB1) to prevent contamination in the tube. (11) TORQUE the connection to the applicable value (Ref. AMM TASK 20-21-12-911-001).
CAUTION:
DO NOT APPLY MORE THAN THE SPECIFIED TORQUE. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE TUBES.
(12) TORQUE the clamp blocks to the applicable values (Ref. AMM TASK 20-21-11-911-001). B. Test
(1) Do a leak check of the sense line connections.
5. Close-up(1) Do a leak check of the sense line connections.
NOTE: Leaks are not permitted.
(2) Make a mark on the unions after you apply the standard or special tightening torque values (Ref. AMM TASK 20-23-22-910-001). Subtask 20-23-11-410-053-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).