DOC AIRBUS | AMM A320FLeak Check of the Nacelle Anti-Icing (NAI) Sense Tubes
TASK 30-21-12-790-802-A
Leak Check of the Nacelle Anti-Icing (NAI) Sense Tubes
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 30-21-12-861-052-A ** ON A/C NOT FOR ALL Subtask 30-21-12-941-052-A ** ON A/C NOT FOR ALL
Subtask 30-21-12-790-050-A ** ON A/C NOT FOR ALL
Subtask 30-21-12-410-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 00:29:10 UTC
Leak Check of the Nacelle Anti-Icing (NAI) Sense Tubes
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.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | Torque wrench: range to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )  | |
| 636-5311 | 1 | NAI SENSELINE FITTING |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.PU1-0001) | Lint-Free Cotton Cloth |
| (Material No.PU1-0087) | Leak Detection Compound |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 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 |
|---|---|---|
| 2 | SEAL | AIPC 30-21-86-01-615 |
| 5 | SEAL | AIPC 30-21-86-01-615 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
| TASK 30-21-12-400-801-A | Installation of the Nacelle Anti-Ice Sense-Tubes |
| TASK 30-21-49-200-807-A | Inspection and Cleaning of the Nacelle Anti-Icing (NAI) Duct Sense-Line Tap |
| TASK 71-00-00-860-832-A | Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC |
| 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 78-36-00-010-802-A | Opening of the Thrust Reverser Cowl-Doors |
| TASK 78-36-00-410-802-A | Closing of the Thrust Reverser Cowl-Doors |
NAI-Sense-Tubes Leak CheckSubtask 30-21-12-861-052-A ** ON A/C NOT FOR ALL Subtask 30-21-12-941-052-A ** ON A/C NOT FOR ALL
B. Safety Precautions
(1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).
Subtask 30-21-12-865-054-A ** ON A/C NOT FOR ALL (1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 30-21-12-010-054-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 122VU | ANTI ICE/ENG/1 | 1DN1 | X10 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 122VU | ANTI ICE/ENG/2 | 1DN2 | W10 |
D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
Subtask 30-21-12-040-053-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
E. Deactivation of the Thrust Reverser System for Ground Maintenance
Subtask 30-21-12-010-055-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) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805). F. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
4. Procedure(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 30-21-12-790-050-A ** ON A/C NOT FOR ALL
A. Leak Check of the NAI Sense Tubes
(a) Remove the bolts (1) and (4) and the seals (2) and (5) from the NAI duct.
(b) Do the servicing of the NAI-duct sense-line tap (Ref. AMM TASK 30-21-49-200-807):
1 Do not install the bolts (1) and (4) back on the NAI duct at this time.
(d) TORQUE the 636-5311 NAI SENSELINE FITTING (3) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN ).
1 Make sure that the filter removes oil fumes, water, hydrocarbons and particles as small as 15 microns from the shop air.
(f) Pressurize the NAI system at a rate not more than 10 psi (1 bar) for each minute with the ambient-temperature shop air. Let the NAI system become stable at 30 psi (2 bar) to 40 psi (3 bar).
(h) Examine the upper NAI-valve sense-tube-connections for leaks.
(i) If there are leaks, do the steps that follow:
1 Release the pressure from the NAI system.
2 Tighten the connections where there is leakage (Ref. AMM TASK 30-21-12-400-801).
3 Do steps 4.A.(1)(f) thru 4.A.(1)(i).
4 Make sure that there are no leaks.
(k) Disconnect the shop air.
(m) Install the 636-5311 NAI SENSELINE FITTING (3) on the lower-valve sense-line tap.
(n) TORQUE the 636-5311 NAI SENSELINE FITTING (3) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN ).
1 Make sure that the filter removes oil fumes, water, hydrocarbons and particles as small as 15 microns from the shop air.
(p) Pressurize the NAI system at a rate not more than 10 psi (1 bar) for each minute with the ambient-temperature shop air. Let the NAI system become stable at 30 psi (2 bar) to 40 psi (3 bar).
(r) Examine the lower NAI-valve sense-tube-connections for leaks.
(s) If there are leaks, do the steps that follow:
1 Release the pressure from the NAI system.
2 Tighten the connections where there is leakage (Ref. AMM TASK 30-21-12-400-801).
3 Do steps 4.A.(1)(p) thru 4.A.(1)(s).
4 Make sure that there are no leaks.
(u) Disconnect the shop air.
(v) Remove the 636-5311 NAI SENSELINE FITTING (3) from the lower-valve sense-line tap.
(w) Make sure that there is no blockage in the NAI-duct sense-line taps.
(x) Install the bolts (1) and (4) and the new AIPC 30-21-86-01-615 SEAL (2) and AIPC 30-21-86-01-615 SEAL (5) on the NAI duct (Ref. AMM TASK 30-21-49-200-807).
(y) Remove the Leak Detection Compound (Material No.PU1-0087) from the NAI sense-tube connections with a clean Lint-Free Cotton Cloth (Material No.PU1-0001) .
5. Close-upCAUTION:
REMOVE AND INSTALL PROTECTION COVERS AS NECESSARY TO PREVENT DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS.
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS.
(1) Do the leak check of the NAI sense tubes as follows:(a) Remove the bolts (1) and (4) and the seals (2) and (5) from the NAI duct.
(b) Do the servicing of the NAI-duct sense-line tap (Ref. AMM TASK 30-21-49-200-807):
1 Do not install the bolts (1) and (4) back on the NAI duct at this time.
CAUTION:
DO NOT:
- APPLY ANTI-SEIZE COMPOUND TO THE NAI TEST PLUG
- LET ANTI-SEIZE COMPOUND GET INTO THE SENSE TUBES OR CAUSE A BLOCKAGE OF THEM.
DEBRIS THAT GETS INTO THE SENSE TUBES CAN CAUSE INCORRECT OPERATION OF THE ANTI-ICE SYSTEM.
(c) Install the 636-5311 NAI SENSELINE FITTING (3) on the upper-valve sense-line tap.(d) TORQUE the 636-5311 NAI SENSELINE FITTING (3) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )
.CAUTION:
MAKE SURE THAT:
(e) Connect the shop air with a 15 micron absolute-filter to the 636-5311 NAI SENSELINE FITTING (3):- YOU USE FILTERED SHOP AIR
- THE DEBRIS DOES NOT GO INTO THE SENSE TUBES OR CAUSE A BLOCKAGE.
1 Make sure that the filter removes oil fumes, water, hydrocarbons and particles as small as 15 microns from the shop air.
(f) Pressurize the NAI system at a rate not more than 10 psi (1 bar) for each minute with the ambient-temperature shop air. Let the NAI system become stable at 30 psi (2 bar) to 40 psi (3 bar).
NOTE: It is recommended that you pressurize the NAI system more than 30 psi (2 bar) at all times during the test.
(g) Apply the Leak Detection Compound (Material No.PU1-0087) or an equivalent solution to the upper NAI-valve sense-tube-connections.(h) Examine the upper NAI-valve sense-tube-connections for leaks.
(i) If there are leaks, do the steps that follow:
1 Release the pressure from the NAI system.
2 Tighten the connections where there is leakage (Ref. AMM TASK 30-21-12-400-801).
3 Do steps 4.A.(1)(f) thru 4.A.(1)(i).
4 Make sure that there are no leaks.
NOTE: Leakage is permitted only for the areas shown in the illustration.
(j) Release the pressure from the NAI system.(k) Disconnect the shop air.
CAUTION:
DO NOT:
- APPLY ANTI-SEIZE COMPOUND TO THE NAI TEST PLUG
- LET ANTI-SEIZE COMPOUND GET INTO THE SENSE TUBES OR CAUSE A BLOCKAGE OF THEM.
DEBRIS THAT GETS INTO THE SENSE TUBES CAN CAUSE INCORRECT OPERATION OF THE ANTI-ICE SYSTEM.
(l) Remove the 636-5311 NAI SENSELINE FITTING (3) from the upper-valve sense-line tap.(m) Install the 636-5311 NAI SENSELINE FITTING (3) on the lower-valve sense-line tap.
(n) TORQUE the 636-5311 NAI SENSELINE FITTING (3) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )
.CAUTION:
MAKE SURE THAT:
(o) Connect the shop air with the 15 micron absolute-filter to the 636-5311 NAI SENSELINE FITTING (3):- YOU USE FILTERED SHOP AIR
- THE DEBRIS DOES NOT GO INTO THE SENSE TUBES OR CAUSE A BLOCKAGE.
1 Make sure that the filter removes oil fumes, water, hydrocarbons and particles as small as 15 microns from the shop air.
(p) Pressurize the NAI system at a rate not more than 10 psi (1 bar) for each minute with the ambient-temperature shop air. Let the NAI system become stable at 30 psi (2 bar) to 40 psi (3 bar).
NOTE: It is recommended that you pressurize the NAI system more than 30 psi (2 bar) at all times during the test.
(q) Apply the Leak Detection Compound (Material No.PU1-0087) or an equivalent solution to the lower NAI-valve sense-tube-connections.(r) Examine the lower NAI-valve sense-tube-connections for leaks.
(s) If there are leaks, do the steps that follow:
1 Release the pressure from the NAI system.
2 Tighten the connections where there is leakage (Ref. AMM TASK 30-21-12-400-801).
3 Do steps 4.A.(1)(p) thru 4.A.(1)(s).
4 Make sure that there are no leaks.
NOTE: Leakage is permitted only for the areas shown in the illustration.
(t) Release the pressure from the NAI system.(u) Disconnect the shop air.
(v) Remove the 636-5311 NAI SENSELINE FITTING (3) from the lower-valve sense-line tap.
(w) Make sure that there is no blockage in the NAI-duct sense-line taps.
(x) Install the bolts (1) and (4) and the new AIPC 30-21-86-01-615 SEAL (2) and AIPC 30-21-86-01-615 SEAL (5) on the NAI duct (Ref. AMM TASK 30-21-49-200-807).
(y) Remove the Leak Detection Compound (Material No.PU1-0087) from the NAI sense-tube connections with a clean Lint-Free Cotton Cloth (Material No.PU1-0001) .
Subtask 30-21-12-410-054-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) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
Subtask 30-21-12-440-052-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 30-21-12-410-055-A ** ON A/C NOT FOR ALL C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
Subtask 30-21-12-865-055-A ** ON A/C NOT FOR ALL (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 30-21-12-862-052-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 122VU | ANTI ICE/ENG/1 | 1DN1 | X10 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 122VU | ANTI ICE/ENG/2 | 1DN2 | W10 |