DOC AIRBUS | AMM A320FInstallation of the APU Fuel Pressure Switch
TASK 28-22-15-400-001-A
Installation of the APU Fuel Pressure Switch
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 28-22-15-860-050-A
Subtask 28-22-15-420-051-A
Subtask 28-22-15-410-052-A
[Rev.10 from 2021]
2026.04.02 06:17:31 UTC
Installation of the APU Fuel Pressure Switch
WARNING:
OBEY THE FUEL SAFETY PROCEDURES.
FIN: 7QC
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) |
| No specific | 1 | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 3.3 and 2.7 m.daN (24.34 and 19.91 lbf.ft )  |
| REFERENCE | DESIGNATION |
|---|---|
| No specific | corrosion-resistant steel lockwire 0.6 mm (0.024 in.) dia |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 4 | O-RINGS | AIPC 28-22-03-01-210 |
| 4 | O-RINGS | AIPC 28-22-83-01-330 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 28-00-00-910-001-A | Fuel Safety Procedures |
| TASK 28-22-00-710-002-A | Operational Test of the APU Fuel-Pump System |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
APU Fuel Pressure SwitchSubtask 28-22-15-860-050-A
A. Aircraft Maintenance Configuration
(1) When you do maintenance work on the fuel system you must obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW is in the off position (the ON legend is off).
(3) On the FUEL overhead panel 40VU, make sure that all L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(4) Make sure that the WARNING NOTICE(S) is in position:
(6) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the MLG door.
Subtask 28-22-15-865-052-A (1) When you do maintenance work on the fuel system you must obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) On the APU section of the overhead panel 25VU, make sure that the APU MASTER SW is in the off position (the ON legend is off).
(3) On the FUEL overhead panel 40VU, make sure that all L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(4) Make sure that the WARNING NOTICE(S) is in position:
- on the overhead panel 25VU, to tell persons not to operate the APU MASTER SW,
- on the FUEL panel 40VU, to tell persons not to operate the fuel system,
- on the APU FIRE panel 20VU, to tell persons not to operate the fire extinguishing system.
(6) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the MLG door.
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | APU/FUEL/BLOW OFF/PUMP | 2QC | B14 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/FUEL/BLOW OFF/CTL | 1QC | K39 |
| ** ON A/C ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
| 121VU | APU/FUEL/PUMP/CTL | 3QC | M38 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/FUEL/BLOW OFF/CTL | 1QC | P38 |
Subtask 28-22-15-420-051-A
A. Installation of the APU Fuel Pressure Switch (7QC)
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Put new AIPC 28-22-03-01-210 O-RINGS (4) or AIPC 28-22-83-01-330 O-RINGS (4) on the banjo head (6) of the APU fuel pressure switch (1).
(4) Install the APU fuel pressure switch (1) to the check valve (3) with the plug (5).
(5) TORQUE the plug (5) to between 3.3 and 2.7 m.daN (24.34 and 19.91 lbf.ft ).
(6) Safety the plug (5) together with the check valve (3) with corrosion-resistant steel lockwire 0.6 mm (0.024 in.) dia.
(7) Remove the blanking caps from the electrical connectors.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Install the electrical connector (2) to the APU fuel pressure switch (1).
Subtask 28-22-15-865-053-A (1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Put new AIPC 28-22-03-01-210 O-RINGS (4) or AIPC 28-22-83-01-330 O-RINGS (4) on the banjo head (6) of the APU fuel pressure switch (1).
(4) Install the APU fuel pressure switch (1) to the check valve (3) with the plug (5).
(5) TORQUE the plug (5) to between 3.3 and 2.7 m.daN (24.34 and 19.91 lbf.ft )
. (6) Safety the plug (5) together with the check valve (3) with corrosion-resistant steel lockwire 0.6 mm (0.024 in.) dia.
(7) Remove the blanking caps from the electrical connectors.
(8) Make sure that all the electrical connections are clean and in the correct condition.
(9) Install the electrical connector (2) to the APU fuel pressure switch (1).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 28-22-15-710-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | APU/FUEL/BLOW OFF/PUMP | 2QC | B14 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/FUEL/BLOW OFF/CTL | 1QC | K39 |
| ** ON A/C ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
| 121VU | APU/FUEL/PUMP/CTL | 3QC | M38 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/FUEL/BLOW OFF/CTL | 1QC | P38 |
C. Test
(1) Do the operational test of the APU fuel pump system (Ref. AMM TASK 28-22-00-710-002).
(2) Examine the connections of the APU fuel pressure switch for leaks.
5. Close-up(1) Do the operational test of the APU fuel pump system (Ref. AMM TASK 28-22-00-710-002).
(2) Examine the connections of the APU fuel pressure switch for leaks.
NOTE: Leaks are not permitted.
Subtask 28-22-15-410-052-A
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 LH MLG door. (Ref. AMM TASK 32-12-00-410-001)
(4) 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) Close the LH MLG door. (Ref. AMM TASK 32-12-00-410-001)
(4) Remove the WARNING NOTICE(S).