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49-90-00-810-812-A - Lube Pump Filter SW P9/GEN SCAV Filter SW P5 Fault (131-9 (A) )

This document provides troubleshooting steps for an oil filter switch fault on an APU. It details possible causes, fault confirmation procedures, and fault isolation steps to check components like the electrical control box, oil filter pressure switches, wiring harnesses, and connectors. Multimeters are used to check continuity between pins on switches and connectors.

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Rahul Sharma
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168 views4 pages

49-90-00-810-812-A - Lube Pump Filter SW P9/GEN SCAV Filter SW P5 Fault (131-9 (A) )

This document provides troubleshooting steps for an oil filter switch fault on an APU. It details possible causes, fault confirmation procedures, and fault isolation steps to check components like the electrical control box, oil filter pressure switches, wiring harnesses, and connectors. Multimeters are used to check continuity between pins on switches and connectors.

Uploaded by

Rahul Sharma
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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TSM - AIC - A318/A319/A320/A321 REV DATE: Feb 01/2022

Tail Number - MSN - FSN: ALL


49-90-00-810-812-A - Lube Pump Filter SW P9/GEN SCAV Filter SW P5
Fault (131-9(A))
Apu snag

** ON A/C FSN ALL


TASK 49-90-00-810-812-A
Lube Pump Filter SW P9/GEN SCAV Filter SW P5 Fault (131-9(A))
1. Possible Causes:

-ELECTRONIC CONTROL BOX (59KD)


-APU (4005KM)
-OIL FILTER SWITCH SHOWS ELECTRICAL GROUND
-damage/contamination of electrical connectors P9 and P5
-OIL FILTER PRESSURE-SWITCH (8070KM)
-OIL FILTER PRESSURE-SWITCH (8071KM)
2. Job Set-up Information

A. Fixtures, Tools, Test and Support Equipment

QT
REFERENCE DESIGNATION
Y
No specific 1 MULTIMETER - STANDARD

B. Referenced Information

REFERENCE DESIGNATION
Ref. AMM 49-00-00-860-008 APU Start by External Power
Ref. AMM 49-00-00-860-009 APU Shutdown by External Power (131-9(A))
Ref. AMM 49-11-11-000-004 Removal of the Power Plant (APU) (131-9(A))
Ref. AMM 49-11-11-400-004 Installation of the Power Plant (APU) (131-9(A))
Ref. AMM 49-61-34-000-003 Removal of the Electronic Control Box (ECB) (131-9(A))
Ref. AMM 49-61-34-400-003 Installation of the Electronic Control Box (ECB) (131-9(A))
Ref. AMM 49-91-14-000-002 Removal of the Oil Filter Differential Pressure Switches (131-9(A))
Ref. AMM 49-91-14-400-002 Installation of the Oil Filter Differential Pressure Switches (131-9(A))

3. Fault Confirmation
SUBTASK 49-90-00-710-062-A
A. Read-out of ECB Trouble Shooting Data
(1) Start the APU Ref. AMM 49-00-00-860-008 and operate it for 5 minutes.
(2) If the APU starts, no maintenance action is necessary.
(3) Shut down the APU Ref. AMM 49-00-00-860-009.
(4) If the APU does not start, do the steps that follow:
(a) Put the APU MASTER SW to the ON position.

JCP Title: TSM © AIRBUS S.A.S. ALL RIGHTS RESERVED. Page 1 of 4


CONFIDENTIAL AND PROPRIETARY DOCUMENT. PRINT DATE: Feb 19/2022
TSM - AIC - A318/A319/A320/A321 REV DATE: Feb 01/2022
Tail Number - MSN - FSN: ALL
49-90-00-810-812-A - Lube Pump Filter SW P9/GEN SCAV Filter SW P5
Fault (131-9(A))
Apu snag

(b) Get access to the APU LAST LEG/PREVIOUS LEG report.


(c) Push the '>' adjacent to the related CFDS failure message:
- The MCDU menu shows:
OIL FILTER SWITCH SHOWS ELECTRICAL GROUND
- Do the Fault Confirmation that follows:
1 Start the APU Ref. AMM 49-00-00-860-008.
2 Get access to the APU GND SCANNING menu.
3 Shut down the APU Ref. AMM 49-00-00-860-009
4 Wait until the ECB (59KD) power-down, speed < 7% plus 30 seconds.
5 Get access to the APU GND SCANNING menu.

4. Fault Isolation
SUBTASK 49-90-00-810-056-B
A. If the APU GND SCANNING menu gives the maintenance message OIL FILTER SWITCHES (8070KM)
/(8071KM) associated with fault code number 101:
(1) Do a check for damage/contamination of electrical connectors P9 and P5 of the OIL FILTER
SWITCHES (8070KM)/(8071KM).
(a) If electrical connector(s) P9 or/and P5 is/are damaged, repair it/them.
(b) If you find contamination on electrical connector(s) P9 or/and P5, clean it/them.
(c) If the electrical connectors are serviceable:
1 Remove connectors P5 and P9 from the APU.
2 With the APU off, do a continuity test between pins 1 and 2 at the filter DP switches.
a If the measured value is more than 10 kOhm, continue the troubleshooting
procedure.
b If the measured value is less than 10 kOhm:
- Replace the OIL FILTER PRESSURE-SWITCH (8070KM) or the OIL
FILTER PRESSURE-SWITCH (8071KM) Ref. AMM 49-91-14-000-002
and Ref. AMM 49-91-14-400-002.
- Do a second continuity test between pins 1 and 2 at the filter DP
switches.
- If the measured value is more than 10 kOhm, continue the
troubleshooting procedure.
3 With the APU off, do a continuity test from pin 1 to the switch case at the filter DP
switches.
a If the measured value is more than 10 kOhm, continue the troubleshooting
procedure.
b If the measured value is less than 10 kOhm:
-

JCP Title: TSM © AIRBUS S.A.S. ALL RIGHTS RESERVED. Page 2 of 4


CONFIDENTIAL AND PROPRIETARY DOCUMENT. PRINT DATE: Feb 19/2022
TSM - AIC - A318/A319/A320/A321 REV DATE: Feb 01/2022
Tail Number - MSN - FSN: ALL
49-90-00-810-812-A - Lube Pump Filter SW P9/GEN SCAV Filter SW P5
Fault (131-9(A))
Apu snag

Replace the OIL FILTER PRESSURE-SWITCH (8070KM) or the OIL


FILTER PRESSURE-SWITCH (8071KM) Ref. AMM 49-91-14-000-002
and Ref. AMM 49-91-14-400-002.
- Do a second continuity test from pin 1 to the switch case at the filter
DP switches.
- If the measured value is more than 10 kOhm, continue the
troubleshooting procedure.
4 Do the check that follows:
a Make sure that the oil temperature is less than 80 deg.F (26.67 deg.C).
b Start the APU Ref. AMM 49-00-00-860-008.
c Monitor the DP switches with a MULTIMETER - STANDARD while the oil
temperature increases:
- Do a check to know if one or two of the switches close during or after
the start.

NOTE: The closed switch is given as less than 30 Ohm.


- Monitor APU Toil until the temperature is more than 100 deg.F (37.78
deg.C).

NOTE: To increase the APU oil temperature faster, you can apply an
electrical load to the APU.
NOTE: The AIDS can give the APU Toil on the ECAM with the "OTA" code.
- Wait until the APU oil temperature is more than 100 deg.F (37.78 deg.
C) and do a check to make sure that the two DP switches are open.
(2) If no problem occurs during this procedure, do a check of the APU wiring harness as follows:
(a) Install connectors P5 and P9.
(b) Remove connector P1 at the APU compartment bulkhead.
(c) Do a continuity test between pins 4 and 9 at the firewall.
1 No continuity is permitted.
(d) Do a continuity test between pin 9 and the structural ground.
1 No continuity is permitted.
(e) Bend the wires near the plugs to do a test for intermittent short-circuits.
(3) If no problem occurs during this procedure, do a check of the aircraft wiring harness as follows:
(a) Install connector P1 at the APU compartment bulkhead.
(b) Remove the ECB Ref. AMM 49-61-34-000-003.
(c) Do a continuity test from pin 11C to the structural ground.
1 No continuity is permitted.
(d) Bend the wires near the plugs to do a test for intermittent short-circuits.
(4)

JCP Title: TSM © AIRBUS S.A.S. ALL RIGHTS RESERVED. Page 3 of 4


CONFIDENTIAL AND PROPRIETARY DOCUMENT. PRINT DATE: Feb 19/2022
TSM - AIC - A318/A319/A320/A321 REV DATE: Feb 01/2022
Tail Number - MSN - FSN: ALL
49-90-00-810-812-A - Lube Pump Filter SW P9/GEN SCAV Filter SW P5
Fault (131-9(A))
Apu snag

If no problem occurs in this procedure, replace the OIL FILTER PRESSURE-SWITCH (8070KM)
and the OIL FILTER PRESSURE-SWITCH (8071KM) Ref. AMM 49-91-14-000-002 and Ref.
AMM 49-91-14-400-002.
(a) Do the test given in Para. Fault Confirmation
(5) If the fault continues:
(a) Replace the ELECTRONIC CONTROL BOX (59KD) Ref. AMM 49-61-34-000-003 and
Ref. AMM 49-61-34-400-003.
(b) Do the test given in Para. Fault Confirmation
(6) If the fault continues:
(a) Replace the APU (4005KM) Ref. AMM 49-11-11-000-004 and Ref. AMM 49-11-11-400-
004.
SUBTASK 49-90-00-710-063-A
B. Do the test given in Para. Fault Confirmation

JCP Title: TSM © AIRBUS S.A.S. ALL RIGHTS RESERVED. Page 4 of 4


CONFIDENTIAL AND PROPRIETARY DOCUMENT. PRINT DATE: Feb 19/2022

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