DOC AIRBUS | AMM A320FPressure Sub-System and Sense Line Dry Out [CFML]
TASK 73-21-45-210-802-A
Pressure Sub-System and Sense Line Dry Out
Over time and under certain operating conditions, moisture can accumulate inside the pressure sub-system sensor air manifolds and air tubes (compressor discharge pressure (PS3) and compressor bleed pressure (P3B) sense lines). This task gives the instructions to remove accumulated moisture from the pressure sub-system sensing system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 73-21-45-941-053-A
Subtask 73-21-45-210-051-A
Subtask 73-21-45-710-051-A Subtask 73-21-45-410-053-A
[Rev.10 from 2021]
2026.04.01 03:04:56 UTC
Pressure Sub-System and Sense Line Dry Out
ZONE: 400
1. Reason for the JobOver time and under certain operating conditions, moisture can accumulate inside the pressure sub-system sensor air manifolds and air tubes (compressor discharge pressure (PS3) and compressor bleed pressure (P3B) sense lines). This task gives the instructions to remove accumulated moisture from the pressure sub-system sensing system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M(3 FT) |
| No specific | 1 | GUN - HOT AIR |
| No specific | 1 | PIPETTE |
| No specific | 1 | SYRINGE |
| No specific | AR | WARNING NOTICE(S) |
| No specific | 1 | WRENCH - TORQUE |
| No specific | Torque wrench: range to between 46.2 and 41.8 lbf.in (0.52 and 0.47 m.daN )  | |
| No specific | Torque wrench: range to between 300 and 270 lbf.in (3.39 and 3.05 m.daN ) | |
| RC331931P21 | 1 | HOSE ASSEMBLY |
| RC331931P22 | 1 | UNION TEE FITTING |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2442) | engine oil |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 73-29-00-740-803-A | Idle Test (Menu Mode) |
PS3 Sense Line, P3B Sense Line and Pressure Sub-System Sensing SystemsSubtask 73-21-45-941-053-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 73-21-45-010-053-A (1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put the WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
4. Procedure(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 73-21-45-210-051-A
A. General
(1) For the procedure without optional parts (see Para. 4.G. Table 4), do Para. 4.B., Para. 4.C., Para. 4.D. and Para. 4.F.
(2) For the procedure with optional parts (see Para. 4.G. Table 4), do Para. 4.B., Para. 4.E. and Para. 4.F.
Subtask 73-21-45-020-051-A (1) For the procedure without optional parts (see Para. 4.G. Table 4), do Para. 4.B., Para. 4.C., Para. 4.D. and Para. 4.F.
(2) For the procedure with optional parts (see Para. 4.G. Table 4), do Para. 4.B., Para. 4.E. and Para. 4.F.
NOTE: If you use optional parts (see Para. 4.G. Table 4), the two PS3 and P3B pressure ports on the pressure sub-system (1) can be vacuumed together and the heat source must be applied to the PS3 and P3B pressure ports.
(3) B. Disconnect the PS3 and P3B Sense Lines from the Pressure Sub-System
(1) Disconnect the PS3 sense line (2) from the pressure sub-system (1) as follows:
(b) Disconnect the PS3 sense line (2) B-nut:
(2) Disconnect the P3B sense line (3) from the pressure sub-system (1) as follows:
(a) Remove the loop-hinged clamp (referred to as the clamp in this procedure) (4) from the assembly bracket (referred to as the bracket in this procedure) (6) as follows:
1 Remove the bolt double hexagonal head (referred to as bolt in this procedure) (5) from the bracket (6).
2 Remove the clamp (4) from the P3B sense line (3).
(b) Disconnect the P3B sense line (3) B-nut:
Subtask 73-21-45-020-052-A (1) Disconnect the PS3 sense line (2) from the pressure sub-system (1) as follows:
WARNING:
USE EYE PROTECTION WHEN YOU CUT MATERIAL OR PARTS. THE PARTICLES CAN CAUSE DAMAGE TO YOUR EYES.
(a) Remove the safety wire from the PS3 sense line (2) B-nut. (b) Disconnect the PS3 sense line (2) B-nut:
CAUTION:
KEEP THE PS3 SENSE LINE AND OPEN THE PRESSURE SUB-SYSTEM PORTS AWAY FROM CONTAMINATION. IF YOU DO NOT OBEY THIS PRECAUTION, UNWANTED PARTICLES AND/OR SMALL OBJECTS CAN CAUSE DAMAGE TO THE EQUIPMENT.
1 Disconnect the PS3 sense line (2) B-nut from the pressure sense fittings on the pressure sub-system (1). (2) Disconnect the P3B sense line (3) from the pressure sub-system (1) as follows:
(a) Remove the loop-hinged clamp (referred to as the clamp in this procedure) (4) from the assembly bracket (referred to as the bracket in this procedure) (6) as follows:
1 Remove the bolt double hexagonal head (referred to as bolt in this procedure) (5) from the bracket (6).
2 Remove the clamp (4) from the P3B sense line (3).
WARNING:
USE EYE PROTECTION WHEN YOU CUT MATERIAL OR PARTS. THE PARTICLES CAN CAUSE DAMAGE TO YOUR EYES.
3 Remove the safety wire from the P3B sense line (3) B-nut. (b) Disconnect the P3B sense line (3) B-nut:
CAUTION:
KEEP THE P3B SENSE LINE AND OPEN THE PRESSURE SUB-SYSTEM PORTS AWAY FROM CONTAMINATION. IF YOU DO NOT OBEY THIS PRECAUTION, UNWANTED PARTICLES AND/OR SMALL OBJECTS CAN CAUSE DAMAGE TO THE EQUIPMENT.
1 Disconnect the P3B sense line (3) B-nut from the pressure sense fittings on the pressure sub-system (1). C. PS3 Moisture Removal (without Optional Parts)
(a) After you get access to the PS3 pressure port, put a SYRINGE or PIPETTE into the opening of the PS3 transducer and remove the visible standing water. Continue the water removal until you cannot remove additional water.
(2) Do a vacuum dry-out procedure as follows:
.
1 Set the GUN - HOT AIR temperature. Refer to Table 1.
Table 1 - Minimum Required Alcohol/Water Mixtures
2 Apply heat to the PS3 pressure port with the GUN - HOT AIR for four minutes before you start the vacuum dry-out procedure, and apply the GUN - HOT AIR until the procedure is completed. Refer to Area A.
(c) Do the vacuum procedure as follows:
1 Turn the vacuum relief valve and blank-off valve handles to the open position.
2 Make sure that contamination does not enter the vacuum pump relief port. If the pressure reading is not below the specified level, the procedure could be unsatisfactory.
3 Start the vacuum pump and let the pump motor achieve operating speed.
5 Make sure that the vacuum pump is pulling adequate vacuum on the PS3 manifold.
a If the airport elevation is less than 5000 ft. (1524 m), make sure that the vacuum measurement is within the green-colored region on the vacuum pressure indicator.
b If the airport elevation is more than 5000 ft. (1524 m), find the correct vacuum pressure measurement.
6 Operate the vacuum pump for a minimum of 20 minutes.
7 After 20 minutes of operation, open the vacuum relief valve to release the pressure.
8 Turn off the vacuum pump.
9 Remove the vacuum hose end adapter from the PS3 pressure port.
(3) Blow out the PS3 sense line (2) as follows:
(a) Blow clean, dry air or nitrogen (approximately 100 psi (7 bar), not more than 200 psi (14 bar)) for a minimum of three minutes. Continue until no moisture comes out from the sense line weep hole located at the 6 o'clock position, in the aft location of the fan compartment.
(b) Make sure that the PS3 sense line (2) weep hole is not blocked because of the ice formation, damage or contamination and that there is a free flow of air from the PS3 sense line (2) weep hole.
Subtask 73-21-45-020-053-A WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(1) Do a PS3 transducer visual water removal: (a) After you get access to the PS3 pressure port, put a SYRINGE or PIPETTE into the opening of the PS3 transducer and remove the visible standing water. Continue the water removal until you cannot remove additional water.
(2) Do a vacuum dry-out procedure as follows:
CAUTION:
BEFORE YOU USE THE TOOL, READ THE MANUFACTURER'S INSTRUCTIONS, AND, WHILE YOU OPERATE THIS TOOL, CAREFULLY OBEY THEM. IF YOU DO NOT DO THIS, DAMAGE TO EQUIPMENT CAN OCCUR.
CAUTION:
CHANGE THE OIL IN THE VACUUM PUMP AFTER 50 OPERATION CYCLES. IF YOU DO NOT OBEY THIS INSTRUCTION, MALFUNCTION OF THE VACUUM PUMP CAN OCCUR.
(a) Connect the vacuum hose end adapter of the vacuum pump to the PS3 pressure port on the pressure sub-system (1). TORQUE the fitting to between 300 and 270 lbf.in (3.39 and 3.05 m.daN ) . CAUTION:
DO NOT USE A NON-VARIABLE HEAT GUN WHEN THE AMBIENT AIR TEMPERATURE IS LESS THAN 65 DEG.F (18.3 DEG.C). IF YOU DO, THERE IS A RISK THAT YOU CANNOT COMPLETE THE VACUUM DRY-OUT PROCEDURE.
(b) If the ambient temperature is less than 65 deg.F (18.3 deg.C), use the GUN - HOT AIR to heat the PS3 pressure port and do as follows: 1 Set the GUN - HOT AIR temperature. Refer to Table 1.
Table 1 - Minimum Required Alcohol/Water Mixtures
| AMBIENT TEMPERATURE | MAXIMUM HEAT GUN SETTING |
|---|---|
| 65 deg.F (18.3 deg.C) to 50 deg.F (10.0 deg.C) | 250 deg.F (121.1 deg.C) |
| 49 deg.F (9.4 deg.C) to 32 deg.F (0.0 deg.C) | 300 deg.F (148.9 deg.C) |
| 31 deg.F (-0.6 deg.C) to 14 deg.F (-10.0 deg.C) | 400 deg.F (204.4 deg.C) |
| 13 deg.F (-10.6 deg.C) to -4 deg.F (-20.0 deg.C) | 500 deg.F (260.0 deg.C) |
| Less than -4 deg.F (-20.0 deg.C) | Not recommended |
(c) Do the vacuum procedure as follows:
1 Turn the vacuum relief valve and blank-off valve handles to the open position.
2 Make sure that contamination does not enter the vacuum pump relief port. If the pressure reading is not below the specified level, the procedure could be unsatisfactory.
3 Start the vacuum pump and let the pump motor achieve operating speed.
CAUTION:
DO NOT CLOSE THE BLANK-OFF VALVE WHILE YOU REMOVE MOISTURE FROM THE PRESSURE SUB-SYSTEM. IF YOU DO, IT WILL NOT BE POSSIBLE TO REMOVE THE MOISTURE.
4 Turn the valve handle of the vacuum relief valve to the horizontal position to close it. 5 Make sure that the vacuum pump is pulling adequate vacuum on the PS3 manifold.
a If the airport elevation is less than 5000 ft. (1524 m), make sure that the vacuum measurement is within the green-colored region on the vacuum pressure indicator.
b If the airport elevation is more than 5000 ft. (1524 m), find the correct vacuum pressure measurement.
NOTE: The vacuum achieved needs to be corrected based on the pressure altitude at which the pump is used.
c If the vacuum measurement is not correct, check for leaks in the vacuum hose and connections and make sure the pump valves are in the correct position. 6 Operate the vacuum pump for a minimum of 20 minutes.
7 After 20 minutes of operation, open the vacuum relief valve to release the pressure.
8 Turn off the vacuum pump.
9 Remove the vacuum hose end adapter from the PS3 pressure port.
(3) Blow out the PS3 sense line (2) as follows:
(a) Blow clean, dry air or nitrogen (approximately 100 psi (7 bar), not more than 200 psi (14 bar)) for a minimum of three minutes. Continue until no moisture comes out from the sense line weep hole located at the 6 o'clock position, in the aft location of the fan compartment.
(b) Make sure that the PS3 sense line (2) weep hole is not blocked because of the ice formation, damage or contamination and that there is a free flow of air from the PS3 sense line (2) weep hole.
NOTE: To get the best results, compressed nitrogen is recommended.
D. P3B Moisture Removal (without Optional Parts)
(a) After you get access to the P3B hose pressure port, put a SYRINGE or PIPETTE into the opening of the P3B transducer and remove the visible standing water. Continue the water removal until you cannot remove the additional water.
(2) Do a vacuum dry-out procedure as follows:
.
1 Set the GUN - HOT AIR temperature. Refer to Step 4.C. Table 1.
2 Apply heat to the P3B pressure port with the GUN - HOT AIR for four minutes before you start the vacuum dry-out procedure, and apply the GUN - HOT AIR until the procedure is completed. Refer to area A in
(c) Do the vacuum procedure as follows:
1 Turn the vacuum relief valve and blank-off valve handles to the open position.
2 Make sure that contamination does not enter the vacuum pump relief port. If the pressure reading is not below the specified level, the procedure could be unsatisfactory.
3 Start the vacuum pump and let the pump motor achieve operating speed.
5 Make sure that the vacuum pump is pulling adequate vacuum on the P3B manifold.
a If the airport elevation is less than 5000 ft. (1524 m), make sure that the vacuum measurement is within the green-colored region on the vacuum pressure indicator.
b If the airport elevation is more than 5000 ft. (1524 m), find the correct vacuum pressure measurement.
6 Operate the vacuum pump for a minimum of 20 minutes.
7 After 20 minutes of operation, open the vacuum relief valve to release the pressure.
8 Turn off the vacuum pump.
9 Remove the vacuum hose end adapter from the P3B pressure port.
(3) Blow out the P3B sense line (3) as follows:
(a) Blow clean, dry air or nitrogen (approximately 100 psi (7 bar), not more than 200 psi (14 bar)) for a minimum of three minutes. Continue until no moisture comes out from the sense line weep hole located at the 6 o'clock position, in the aft location of the fan compartment.
(b) Make sure that the P3B sense line (3) weep hole is not blocked because of ice formation, damage or contamination and that there is a free flow of air from the P3B sense line (3) weep hole.
Subtask 73-21-45-020-054-A WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(1) Do a P3B transducer visual water removal: (a) After you get access to the P3B hose pressure port, put a SYRINGE or PIPETTE into the opening of the P3B transducer and remove the visible standing water. Continue the water removal until you cannot remove the additional water.
(2) Do a vacuum dry-out procedure as follows:
CAUTION:
BEFORE YOU USE THE TOOL, READ THE MANUFACTURER'S INSTRUCTIONS, AND, WHILE YOU OPERATE THIS TOOL, CAREFULLY OBEY THEM. IF YOU DO NOT DO THIS, DAMAGE TO EQUIPMENT CAN OCCUR.
CAUTION:
CHANGE THE OIL IN THE VACUUM PUMP AFTER 50 OPERATION CYCLES. IF YOU DO NOT OBEY THIS INSTRUCTION, MALFUNCTION OF THE VACUUM PUMP CAN OCCUR.
(a) Connect the vacuum hose end adapter of the vacuum pump to the P3B pressure port on the pressure sub-system (1). TORQUE the fitting to between 300 and 270 lbf.in (3.39 and 3.05 m.daN ) . CAUTION:
DO NOT USE A NON-VARIABLE HEAT GUN WHEN THE AMBIENT AIR TEMPERATURE IS LESS THAN 65 DEG.F (18.3 DEG.C). IF YOU DO, THERE IS A RISK THAT YOU CANNOT COMPLETE THE VACUUM DRY-OUT PROCEDURE.
(b) If the ambient temperature is less than 65 deg.F (18.3 deg.C), use a GUN - HOT AIR to heat the P3B pressure port as follows: 1 Set the GUN - HOT AIR temperature. Refer to Step 4.C. Table 1.
2 Apply heat to the P3B pressure port with the GUN - HOT AIR for four minutes before you start the vacuum dry-out procedure, and apply the GUN - HOT AIR until the procedure is completed. Refer to area A in
(c) Do the vacuum procedure as follows:
1 Turn the vacuum relief valve and blank-off valve handles to the open position.
2 Make sure that contamination does not enter the vacuum pump relief port. If the pressure reading is not below the specified level, the procedure could be unsatisfactory.
3 Start the vacuum pump and let the pump motor achieve operating speed.
CAUTION:
DO NOT CLOSE THE BLANK-OFF VALVE WHILE YOU REMOVE MOISTURE FROM THE PRESSURE SUB-SYSTEM. IF YOU DO, IT WILL NOT BE POSSIBLE TO REMOVE THE MOISTURE.
4 Turn the valve handle of the vacuum relief valve to the horizontal position to close it. 5 Make sure that the vacuum pump is pulling adequate vacuum on the P3B manifold.
a If the airport elevation is less than 5000 ft. (1524 m), make sure that the vacuum measurement is within the green-colored region on the vacuum pressure indicator.
b If the airport elevation is more than 5000 ft. (1524 m), find the correct vacuum pressure measurement.
NOTE: The vacuum achieved needs to be corrected based on the pressure altitude at which the pump is used.
c If the vacuum measurement is not correct, check for leaks in the vacuum hose and connections, and make sure that the pump valves are in the correct position. 6 Operate the vacuum pump for a minimum of 20 minutes.
7 After 20 minutes of operation, open the vacuum relief valve to release the pressure.
8 Turn off the vacuum pump.
9 Remove the vacuum hose end adapter from the P3B pressure port.
(3) Blow out the P3B sense line (3) as follows:
(a) Blow clean, dry air or nitrogen (approximately 100 psi (7 bar), not more than 200 psi (14 bar)) for a minimum of three minutes. Continue until no moisture comes out from the sense line weep hole located at the 6 o'clock position, in the aft location of the fan compartment.
(b) Make sure that the P3B sense line (3) weep hole is not blocked because of ice formation, damage or contamination and that there is a free flow of air from the P3B sense line (3) weep hole.
NOTE: To get the best results, compressed nitrogen is recommended.
E. PS3 and P3B Moisture Removal (with Optional Parts)
(a) After you get access to the PS3 and P3B pressure ports, put a SYRINGE or PIPETTE into the opening of the PS3 and P3B transducers and remove visible standing water. Continue the water removal until you cannot remove additional water.
(2) Do a vacuum dry-out procedure as follows:
(b) Connect one more RC331931P21 HOSE ASSEMBLY to the PS3 pressure port on the pressure sub-system (1).
(c) Connect the other two loose ends of the RC331931P21 HOSE ASSEMBLY to the two horizontal ports on the RC331931P22 UNION TEE FITTING.
(d) Connect the vacuum hose to the T-end of the RC331931P22 UNION TEE FITTING.
(e) TORQUE all the fittings to between 300 and 270 lbf.in (3.39 and 3.05 m.daN ).
1 Set the GUN - HOT AIR temperature. Refer to Step 4.C. Table 1.
2 Apply heat to the PS3 and P3B pressure ports with the GUN - HOT AIR for four minutes before you start the vacuum dry-out procedure, and apply the GUN - HOT AIR until the procedure is completed. Refer to Area A in
(g) Do the vacuum procedure as follows:
1 Turn the vacuum relief valve and blank-off valve handles to the open position.
2 Make sure that contamination does not enter the vacuum pump relief port. If the pressure reading is not below the specified level, the procedure could be unsatisfactory.
3 Start the vacuum pump and let the pump motor get to operating speed.
5 Make sure the vacuum pump is pulling adequate vacuum on the PS3 and P3B manifolds.
a If the airport elevation is less than 5000 ft. (1524 m), make sure the vacuum measurement is within the green-colored region on the vacuum pressure indicator.
b If the airport elevation is more than 5000 ft. (1524 m), find the correct vacuum pressure measurement.
6 Operate the vacuum pump for a minimum of 20 minutes.
7 After 20 minutes of operation, open the vacuum relief valve to release the pressure.
8 Turn off the vacuum pump.
9 Remove the vacuum hose end adapter from the PS3 and P3B pressure ports.
(3) Blow out the PS3 sense line (2) and P3B sense line (3) as follows:
(a) Blow clean, dry air or nitrogen (approximately 100 psi (7 bar), not more than 200 psi (14 bar)) for a minimum for a minimum of three minutes. Continue until no moisture comes out from the sense line weep hole located at the 6 o'clock position, in the aft location of the fan compartment.
(b) Make sure that the PS3 sense line (3) and P3B sense line (2) weep holes are not blocked because of the ice formation, damage or contamination and that there is a free flow of air from the PS3 sense line (2) and P3B sense line (3) weep holes.
Subtask 73-21-45-420-051-A CAUTION:
KEEP THE PS3 SENSE LINE AND OPEN THE PRESSURE SUB-SYSTEM PORTS AWAY FROM CONTAMINATION. IF YOU DO NOT OBEY THIS PRECAUTION, UNWANTED PARTICLES AND/OR SMALL OBJECTS CAN CAUSE DAMAGE TO THE EQUIPMENT.
(1) Do a PS3 and P3B transducer visual water removal: (a) After you get access to the PS3 and P3B pressure ports, put a SYRINGE or PIPETTE into the opening of the PS3 and P3B transducers and remove visible standing water. Continue the water removal until you cannot remove additional water.
(2) Do a vacuum dry-out procedure as follows:
CAUTION:
BEFORE YOU USE THE TOOL, READ THE MANUFACTURER'S INSTRUCTIONS, AND, WHILE YOU OPERATE THIS TOOL, CAREFULLY OBEY THEM. IF YOU DO NOT DO THIS, DAMAGE TO EQUIPMENT CAN OCCUR.
CAUTION:
CHANGE THE OIL IN THE VACUUM PUMP AFTER 50 OPERATION CYCLES. IF YOU DO NOT OBEY THIS INSTRUCTION, MALFUNCTION OF THE VACUUM PUMP CAN OCCUR.
(a) Connect one RC331931P21 HOSE ASSEMBLY to the P3B pressure port on the pressure sub-system (1).(b) Connect one more RC331931P21 HOSE ASSEMBLY to the PS3 pressure port on the pressure sub-system (1).
(c) Connect the other two loose ends of the RC331931P21 HOSE ASSEMBLY to the two horizontal ports on the RC331931P22 UNION TEE FITTING.
(d) Connect the vacuum hose to the T-end of the RC331931P22 UNION TEE FITTING.
(e) TORQUE all the fittings to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )
.CAUTION:
DO NOT USE A NON-VARIABLE HEAT GUN WHEN THE AMBIENT AIR TEMPERATURE IS LESS THAN 65 DEG.F (18.3 DEG.C). IF YOU DO, THERE IS A RISK THAT YOU CANNOT COMPLETE THE VACUUM DRY-OUT PROCEDURE.
(f) If the ambient temperature is less than 65 deg.F (18 deg.C), use a GUN - HOT AIR to heat the PS3 and P3B pressure ports and do as follows: 1 Set the GUN - HOT AIR temperature. Refer to Step 4.C. Table 1.
2 Apply heat to the PS3 and P3B pressure ports with the GUN - HOT AIR for four minutes before you start the vacuum dry-out procedure, and apply the GUN - HOT AIR until the procedure is completed. Refer to Area A in
(g) Do the vacuum procedure as follows:
1 Turn the vacuum relief valve and blank-off valve handles to the open position.
2 Make sure that contamination does not enter the vacuum pump relief port. If the pressure reading is not below the specified level, the procedure could be unsatisfactory.
3 Start the vacuum pump and let the pump motor get to operating speed.
CAUTION:
DO NOT CLOSE THE BLANK-OFF VALVE WHILE YOU REMOVE MOISTURE FROM THE PRESSURE SUB-SYSTEM. IF YOU DO, IT WILL NOT BE POSSIBLE TO REMOVE THE MOISTURE.
4 Turn the valve handle of the vacuum relief valve to the horizontal position to close it. 5 Make sure the vacuum pump is pulling adequate vacuum on the PS3 and P3B manifolds.
a If the airport elevation is less than 5000 ft. (1524 m), make sure the vacuum measurement is within the green-colored region on the vacuum pressure indicator.
b If the airport elevation is more than 5000 ft. (1524 m), find the correct vacuum pressure measurement.
NOTE: The vacuum achieved needs to be corrected based on the pressure altitude at which the pump is used.
c If the vacuum measurement is not correct, check for leaks in the vacuum hose and connections and make sure that the pump valves are in the correct position. 6 Operate the vacuum pump for a minimum of 20 minutes.
7 After 20 minutes of operation, open the vacuum relief valve to release the pressure.
8 Turn off the vacuum pump.
9 Remove the vacuum hose end adapter from the PS3 and P3B pressure ports.
(3) Blow out the PS3 sense line (2) and P3B sense line (3) as follows:
(a) Blow clean, dry air or nitrogen (approximately 100 psi (7 bar), not more than 200 psi (14 bar)) for a minimum for a minimum of three minutes. Continue until no moisture comes out from the sense line weep hole located at the 6 o'clock position, in the aft location of the fan compartment.
(b) Make sure that the PS3 sense line (3) and P3B sense line (2) weep holes are not blocked because of the ice formation, damage or contamination and that there is a free flow of air from the PS3 sense line (2) and P3B sense line (3) weep holes.
NOTE: To get the best results, compressed nitrogen is recommended.
F. Connect PS3 and P3B Sense Lines to the Pressure Sub-System
(1) Connect the PS3 sense line (2) and P3B sense line (3) to the pressure sub-system (1) as follows:
(a) Make sure that the mating surfaces are clean and clear of unwanted materials.
(b) Connect the PS3 sense line (2) and P3B sense line (3) coupling nuts to the pressure sub-system (1) with your hand.
(c) Use the WRENCH - TORQUE to TORQUE the PS3 sense line (2) and P3B sense line (3) coupling nuts to between 300 and 270 lbf.in (3.39 and 3.05 m.daN ).
(d) Install the clamp (4) on the bracket (6) as follows:
1 Install the clamp (4) on the P3B sense line (3).
2 Attach the clamp (4) to the bracket (6) with one bolt (5) and do as follows:
a TORQUE the bolt (5) to between 46.2 and 41.8 lbf.in (0.52 and 0.47 m.daN ).
(e) Safety the PS3 sense line (2) and P3B sense line (3) coupling nuts:
Subtask 73-21-45-480-050-A (1) Connect the PS3 sense line (2) and P3B sense line (3) to the pressure sub-system (1) as follows:
(a) Make sure that the mating surfaces are clean and clear of unwanted materials.
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND CORRECT USE OF CONSUMABLE PRODUCTS.
1 Lubricate the threads of the PS3 sense line (2) and P3B sense line (3) coupling nuts with engine oil (Material No.CP2442) . (b) Connect the PS3 sense line (2) and P3B sense line (3) coupling nuts to the pressure sub-system (1) with your hand.
(c) Use the WRENCH - TORQUE to TORQUE the PS3 sense line (2) and P3B sense line (3) coupling nuts to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )
. (d) Install the clamp (4) on the bracket (6) as follows:
1 Install the clamp (4) on the P3B sense line (3).
2 Attach the clamp (4) to the bracket (6) with one bolt (5) and do as follows:
a TORQUE the bolt (5) to between 46.2 and 41.8 lbf.in (0.52 and 0.47 m.daN )
. (e) Safety the PS3 sense line (2) and P3B sense line (3) coupling nuts:
WARNING:
USE EYE PROTECTION WHEN YOU CUT MATERIAL OR PARTS. THE PARTICLES CAN CAUSE DAMAGE TO YOUR EYES.
1 Safety the PS3 sense line (2) and P3B sense line (3) coupling nuts with the safety wire. G. Additional Tooling Information
Table 2: Vacuum Pump Kit Details
Table 3: Heat Gun Details
Table 4: Optional Parts
5. Close-upTable 2: Vacuum Pump Kit Details
| System Operation | Qty | Description |
|---|---|---|
| Vacuum pump 120V/60Hz | 1 | Vacuum pump capable of 0.1 psi (0.0069 bar) or lower with built-in gauge to between 0 in. (0 mm) to 30 in. (0.762 m) of mercury (Hg). 2-stage rotary vane super vac with gauge. (1/4" and 3/8" male flare fitting supplied with pump). |
| Pump oil | 1 | Vacuum oil (12 Qts.). |
| Start/Bleed valve | 1 | Ball valve 3/8" sea male FI. X female FI. |
| Breather vent | 1 | Sintered metal filter 40 microns. |
| Female NPT to female NPT coupler | 0.1 | Brass coupler (package of 10) 3/8" female NPT to 3/8" female NPT. |
| Smoke eliminator filter | 1 | Smoke eliminator filter for super evac pump. |
| Vacuum hose | 1 | Swagelok PTFE hose with fiber braid, 12' in length, pump connector is 3/8" Swagelok tube fitting, engine control connector is 3/8" JIC (AN) fitting. |
| Pump fitting | 1 | Swagelok stainless steel tube fitting, male connector, 3/8 in. Tube OD x 1/8 in. Male NPT. This fitting replaces the 1/4" SAE fitting on the pump. |
Table 3: Heat Gun Details
| Item | Description | Specification | Optional/Required Accessories |
|---|---|---|---|
| Heat Gun | Steinel HG 2310 LCD three-stage professional heat gun or equivalent. | Heat gun features LOC lockable override control of temperature and airflow output settings. The LCD display enables temperature selection in increments of 10 deg.F (-12.22 deg.C). | Two voltage versions, 120V USA and 230V Europe. |
Table 4: Optional Parts
| Part Number | Nomenclature | Qty |
|---|---|---|
| RC331931P21 | Teflon-6 SST braided Teflon hose assembly (18 inches W/F JIC E/E) | 2 |
| RC331931P22 | J6T union Tee SS fitting | 1 |
Subtask 73-21-45-710-051-A Subtask 73-21-45-410-053-A
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).