DOC AIRBUS | AMM A320FInstallation of the Low Oil Pressure Switch [CFMB]
TASK 79-34-15-400-041-A
Installation of the Low Oil Pressure Switch
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 79-34-15-860-050-A ** ON A/C NOT FOR ALL
Subtask 79-34-15-010-051-A ** ON A/C NOT FOR ALL
Subtask 79-34-15-640-050-A ** ON A/C NOT FOR ALL Subtask 79-34-15-420-050-A ** ON A/C NOT FOR ALL
Subtask 79-34-15-410-050-A ** ON A/C NOT FOR ALL
Subtask 79-34-15-865-070-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:39:49 UTC
Installation of the Low Oil Pressure Switch
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
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
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP2244) | primer 1200 OS |
| (Material No.CP2442) | engine oil |
| (Material No.CP8001) | safetywire 0.032 in. (0.8 mm) dia. |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| No specific | primer SS-4004 |
| No specific | silicone sealant DC 90-006 |
| No specific | silicone sealant RTV-88 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 45 | PACKING | AIPC 79-34-15-01-020 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-710-006-B | Minimum Idle Check |
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
Low Oil Pressure SwitchSubtask 79-34-15-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
Subtask 79-34-15-865-067-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 79-34-15-865-068-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ANTI ICE/PROBES/AOA/1 | 4DA1 | D04 |
| 49VU | ANTI ICE/PROBES/PITOT/1 | 3DA1 | D02 |
| 122VU | ANTI ICE/PROBES/2/TAT | 1DA2 | Y15 |
| 122VU | ANTI ICE/PROBES/2/PITOT | 3DA2 | Y14 |
| 122VU | ANTI ICE/PROBES/2/AOA | 4DA2 | Y13 |
| 122VU | ANTI ICE/PROBES/2/STATIC | 5DA2 | Y11 |
| 122VU | ANTI ICE/PROBES/3/PITOT | 3DA3 | Z16 |
| 122VU | ANTI ICE/PROBES/3/AOA | 4DA3 | Z15 |
| 122VU | ANTI ICE/PROBES/3/STATIC | 5DA3 | Z14 |
| 122VU | ANTI ICE/PROBES/1/STATIC | 5DA1 | Z13 |
| 122VU | ANTI ICE/PROBES/1/TAT | 1DA1 | Z12 |
WARNING:
OPEN THE PROBE HEATER AND WINDOW HEATER CIRCUIT-BREAKERS BEFORE YOU OPEN THE PHC AND WHC CIRCUIT BREAKERS. IF YOU DO NOT OBEY THIS SEQUENCE:
C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:- THE PROBES WILL BECOME TOO HOT.
- THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ANTI ICE/PROBES/PHC/1 | 2DA1 | D03 |
| 122VU | ANTI ICE/WHC/2 | 5DG2 | W13 |
| 122VU | ANTI ICE/WHC/1 | 5DG1 | X13 |
| 122VU | ANTI ICE/PROBES/PHC/3 | 2DA3 | Y16 |
| 122VU | ANTI ICE/PROBES/PHC/2 | 2DA2 | Y12 |
D. Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL, 448AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL, 448AR
Subtask 79-34-15-640-050-A ** ON A/C NOT FOR ALL Subtask 79-34-15-420-050-A ** ON A/C NOT FOR ALL
B. Installation of the Low Oil Pressure Switch
(1) Remove the protective covers from the electrical connector, the low oil pressure switch (25) and the tubes.
(2) Clean the mating surfaces with isopropyl alcohol (Material No.CP1041) and a Textile-Lint free Cotton - (Material No.14SBA1) to be sure of a good electrical bond between the low oil pressure switch (25) and the bracket.
(3) Lubricate the new AIPC 79-34-15-01-020 PACKING (45) with engine oil (Material No.CP2442) .
(4) Install the packings (45) and the unions (40) in the pressure switch (25).
(5) TORQUE the unions to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )
.
(6) Attach the pressure switch (25) and thermo barrier (20) to the bracket with the bolts (35) and the washers (30).
(7) TORQUE the bolts to between 36 and 32 lbf.in (0.41 and 0.36 m.daN ).
(8) Connect the tubes to the unions (40).
(9) TORQUE the coupling nuts to between 160 and 150 lbf.in (1.81 and 1.70 m.daN ).
(a) Use a second wrench to hold the unions when torque the tube coupling nuts.
(10) Connect the electrical connector 4000ENA to the pressure switch (25).
(a) Tighten the connector by hand plus one-eighth turn.
(11) Do an electrical bond resistance check as follows:
(a) Make sure you do an electrical bond resistance check at each bolt location.
(b) Put one lead of the OHMMETER MULTIRANGE on the flange of the pressure switch (25) near the bolt (35).
(c) Put the other lead of the ohmmeter on the surface of the bracket.
(d) The resistance measured between the ohmmeter leads must not be more than 0.0025 ohm. Do a check of the other two bolts.
(e) If the resistance is more than 0.0025 ohm, remove the pressure switch (25) and clean the mating surfaces again. Do this procedure until the resistance is less than 0.0025 ohm.
(12) Seal the electrical bond surfaces as follows:
(a) Mix the primer 1200 OS (Material No.CP2244) or primer SS-4004 per the manufacturer's instructions.
(b) Apply the primer around each bolthead, the pressure switch flange and around the mating surface of the bracket.
1 Mix the sealing and the activator in accordance with the manufacturer's instructions.
a The sealant should not be applied when the temperature is below 50 DEG.F (10 DEG.C).
b Use the silicone sealant DC 90-006 with the primer (DC 1200) or silicone sealant RTV-88 with the primer (SS 4004).
(d) Apply a layer of sealant between 0.010 in. (0.25 mm) and 0.020 in. (0.51 mm) thick around each bolthead, the pressure switch flange, and around the mating surface of the bracket.
(e) Allow the sealant to cure for a minimum of 24 hours in accordance with the manufacturer's instructions.
1 To decrease the cure time, allow the sealant to gel at ambient temperature for a minimum of 2 hours. After 2 hours of gel time, apply a maximum of 120 DEG.F (49 DEG.C) heat to the sealant for a minimum of 2 hours.
(13) Install the insulation housing and booties as follows:
(a) Install the LP bootie (5) and the HP bootie (10) on the tubes. Make sure the capstan on the bootie is in the position.
CP8001 safetywire 0.032 in. (0.8 mm) dia.
1 Twist the safety wire around the bootie and attach it to the capstan again.
2 Do not tighten the safety wire more than necessary to hold the bootie in position on the tube.
(c) Install the insulation housing (15) on the pressure switch (25). Make sure the housing is installed over the ends of the booties (5, 10).
CP8001 safetywire 0.032 in. (0.8 mm) dia.
1 Twist the safety wire around the insulation housing (15) and attach it to the capstan on the opposite side.
2 Do not tighten the safety wire more than necessary to hold the insulation housing in position on the pressure switch.
Subtask 79-34-15-710-050-A ** ON A/C NOT FOR ALL (1) Remove the protective covers from the electrical connector, the low oil pressure switch (25) and the tubes.
(2) Clean the mating surfaces with isopropyl alcohol (Material No.CP1041) and a Textile-Lint free Cotton - (Material No.14SBA1) to be sure of a good electrical bond between the low oil pressure switch (25) and the bracket.
(3) Lubricate the new AIPC 79-34-15-01-020 PACKING (45) with engine oil (Material No.CP2442) .
(4) Install the packings (45) and the unions (40) in the pressure switch (25).
(5) TORQUE the unions to between 120 and 110 lbf.in (1.36 and 1.24 m.daN )
. (6) Attach the pressure switch (25) and thermo barrier (20) to the bracket with the bolts (35) and the washers (30).
(7) TORQUE the bolts to between 36 and 32 lbf.in (0.41 and 0.36 m.daN )
. (8) Connect the tubes to the unions (40).
(9) TORQUE the coupling nuts to between 160 and 150 lbf.in (1.81 and 1.70 m.daN )
. (a) Use a second wrench to hold the unions when torque the tube coupling nuts.
(10) Connect the electrical connector 4000ENA to the pressure switch (25).
(a) Tighten the connector by hand plus one-eighth turn.
(11) Do an electrical bond resistance check as follows:
(a) Make sure you do an electrical bond resistance check at each bolt location.
(b) Put one lead of the OHMMETER MULTIRANGE on the flange of the pressure switch (25) near the bolt (35).
(c) Put the other lead of the ohmmeter on the surface of the bracket.
(d) The resistance measured between the ohmmeter leads must not be more than 0.0025 ohm. Do a check of the other two bolts.
(e) If the resistance is more than 0.0025 ohm, remove the pressure switch (25) and clean the mating surfaces again. Do this procedure until the resistance is less than 0.0025 ohm.
(12) Seal the electrical bond surfaces as follows:
(a) Mix the primer 1200 OS (Material No.CP2244) or primer SS-4004 per the manufacturer's instructions.
(b) Apply the primer around each bolthead, the pressure switch flange and around the mating surface of the bracket.
NOTE: The minimum time for the primer to cure is one hour at 70 DEG.F (21.11 DEG.C).
(c) Use the sealant 1 Mix the sealing and the activator in accordance with the manufacturer's instructions.
a The sealant should not be applied when the temperature is below 50 DEG.F (10 DEG.C).
b Use the silicone sealant DC 90-006 with the primer (DC 1200) or silicone sealant RTV-88 with the primer (SS 4004).
(d) Apply a layer of sealant between 0.010 in. (0.25 mm) and 0.020 in. (0.51 mm) thick around each bolthead, the pressure switch flange, and around the mating surface of the bracket.
(e) Allow the sealant to cure for a minimum of 24 hours in accordance with the manufacturer's instructions.
1 To decrease the cure time, allow the sealant to gel at ambient temperature for a minimum of 2 hours. After 2 hours of gel time, apply a maximum of 120 DEG.F (49 DEG.C) heat to the sealant for a minimum of 2 hours.
(13) Install the insulation housing and booties as follows:
(a) Install the LP bootie (5) and the HP bootie (10) on the tubes. Make sure the capstan on the bootie is in the position.
WARNING:
USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
(b) Put a loop of 1 Twist the safety wire around the bootie and attach it to the capstan again.
2 Do not tighten the safety wire more than necessary to hold the bootie in position on the tube.
(c) Install the insulation housing (15) on the pressure switch (25). Make sure the housing is installed over the ends of the booties (5, 10).
WARNING:
USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
(d) Put a loop of 1 Twist the safety wire around the insulation housing (15) and attach it to the capstan on the opposite side.
2 Do not tighten the safety wire more than necessary to hold the insulation housing in position on the pressure switch.
C. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006) and do a check of the unions for leakage.
5. Close-upSubtask 79-34-15-410-050-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 fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR
(3) Remove the WARNING NOTICE(S).
Subtask 79-34-15-865-069-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 fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR
(3) Remove the WARNING NOTICE(S).
WARNING:
CLOSE THE PHC AND WHC CIRCUIT BREAKERS BEFORE YOU CLOSE THE PROBE HEATER AND WINDOW HEATER CIRCUIT-BREAKERS. IF YOU DO NOT OBEY THIS SEQUENCE:
B. Remove the safety clips and tags and close these circuit breakers in this sequence:- THE PROBES WILL BECOME TOO HOT.
- THIS CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO MAINTENANCE PERSONNEL.
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ANTI ICE/PROBES/PHC/1 | 2DA1 | D03 |
| 122VU | ANTI ICE/WHC/2 | 5DG2 | W13 |
| 122VU | ANTI ICE/WHC/1 | 5DG1 | X13 |
| 122VU | ANTI ICE/PROBES/PHC/3 | 2DA3 | Y16 |
| 122VU | ANTI ICE/PROBES/PHC/2 | 2DA2 | Y12 |
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | ANTI ICE/PROBES/AOA/1 | 4DA1 | D04 |
| 49VU | ANTI ICE/PROBES/PITOT/1 | 3DA1 | D02 |
| 122VU | ANTI ICE/PROBES/2/TAT | 1DA2 | Y15 |
| 122VU | ANTI ICE/PROBES/2/PITOT | 3DA2 | Y14 |
| 122VU | ANTI ICE/PROBES/2/AOA | 4DA2 | Y13 |
| 122VU | ANTI ICE/PROBES/2/STATIC | 5DA2 | Y11 |
| 122VU | ANTI ICE/PROBES/3/PITOT | 3DA3 | Z16 |
| 122VU | ANTI ICE/PROBES/3/AOA | 4DA3 | Z15 |
| 122VU | ANTI ICE/PROBES/3/STATIC | 5DA3 | Z14 |
| 122VU | ANTI ICE/PROBES/1/STATIC | 5DA1 | Z13 |
| 122VU | ANTI ICE/PROBES/1/TAT | 1DA1 | Z12 |