DOC AIRBUS | TSM A320FFailure of the LPC Bleed Master Actuator Channels A and B, on the Engine 2 (A5 engines only)
1. Possible Causes
NOTE: This task is to troubleshoot when the Clear Language Messages (CLM) CHA 2.5 BLD ACT/HC/EEC 2 and
CHB 2.5 BLD ACT/HC/EEC 2 are both present. The fault acronyms listed in the fault confirmation section
below will help you focus on the correct cause of this CLM.
· wiring
· ACTUATOR-MASTER, LPC BLEED ( 4021KS )
· EEC ( 4000KS )
· FMU ( 4000KC )
· PUMP-HP/LP FUEL ( 2001EM )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
73-00-00-810-901-B Multiple Dual Track Check Faults on the Engine 2
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 70-23-15-912-010 Connection of Electrical Connectors
Ref. AMM 71-00-00-710-013 Test No.11 : High Power Assurance Test
Ref. AMM 71-00-00-710-018 Discontinued Start, Restart and Shutdown Procedures
Ref. AMM 71-00-00-710-043 Normal Engine Automatic Start Procedure
Ref. AMM 71-00-00-710-047 Normal Engine Manual Start Procedure
Ref. AMM 71-13-00-010-010 Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
Ref. AMM 72-00-00-600-011 Lubrication of the LPC Bleed Valve Mechanism
Ref. AMM 72-00-00-720-010 Load Check of the LPC Bleed Valve Mechanism
Ref. AMM 72-32-60-200-011 Inspection of the LPC Bleed Duct Seal
Ref. AMM 73-12-41-000-010 Removal of the Low Pressure (LP)/High Pressure (HP) Fuel Pump
Ref. AMM 73-12-41-400-010 Installation of the Low Pressure (LP)/High Pressure (HP) Fuel Pump
Ref. AMM 73-22-00-710-040 Operational Test of the FADEC SYSTEM on the Ground
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
Ref. AMM 73-22-52-000-010 Removal of the Fuel Metering Unit (FMU)
Ref. AMM 73-22-52-400-010 Installation of the Fuel Metering Unit (FMU)
Ref. ASM 73-25-18
Ref. AMM 75-31-42-000-010 Removal of the Low Pressure Compressor (LPC) Bleed-Master Actuator
Ref. AMM 75-31-42-400-010 Installation of the Low Pressure Compressor (LPC) Bleed-Master Actuator
Ref. AMM 78-30-00-440-012 Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after
Ground Maintenance
Ref. AMM 78-32-00-010-010 Opening of the Thrust Reverser Halves
Ref. AMM 78-32-00-410-010 Closing of the Thrust Reverser Halves
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
REFERENCE DESIGNATION
Failure of the LPC Bleed Master Actuator Channels A and B, on the Engine 1(2). SHEET 1
Figure 75(IAE)-30-00-991-02300-A / SHEET 1/1 - Failure of the LPC Bleed Master Actuator Channels
A and B, on the Engine 1(2). not printed, as per printing preferences
3. Fault Confirmation
Subtask 75-30-00-860-127-A
A. Job Set-Up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the ENG section of the maintenance panel 50VU, select FADEC GND PWR 2 pushbutton switch
to the ON position.
Subtask 75-30-00-710-181-A
B. Identify the Test for Fault Confirmation
NOTE: Troubleshooting can start immediately without doing the fault confirmation if this CLM was shown
in multiple flight or ground legs.
(1) Do the CFDS message decoding and read the scheduled maintenance report to identify the fault
acronym related to the CLM (Ref. TSM 70-00-00-03) .
(2) If the readout gives the fault acronym B25WAF in FADEC 2A or FADEC 2B, do the operational test of
the FADEC system on the ground for fault confirmation Ref. AMM 73-22-00-710-040 .
(a) If the test gives the fault acronym B25WAF in FADEC 2A or FADEC 2B, or if there are two or
more occurrences in the fault history, continue with the fault isolation Para. 4.A.
(b) If the test does not give the fault acronym B25WAF in FADEC 2A or FADEC 2B, and if there is
no history of faults, send the engine back to service.
(3) If the readout gives the fault acronym B25L in FADEC 2A or FADEC 2B, do the steps in Para. 3.C. for
fault confirmation (engine idle run to confirm the fault).
(a) If the test gives the fault acronym B25L, or if there are two or more occurrences in the fault
history, continue with the fault isolation Para. 4.B.
(b) If the test does not give the fault acronym B25L in FADEC 2A or FADEC 2B and if there is no
history of faults, send the engine back to service.
(4) If the readout gives the fault acronym B25TK in FADEC 2A or FADEC 2B, do the steps in Para. 3.D.
for the fault confirmation (high power assurance test to confirm the fault).
NOTE: Multiple dual track check faults may indicate a failed fuel pump. Four control units on the
engine are driven by HP fuel: the VSV actuator, the 2.5 bleed controller, the ACOC air
modulating valve and the active clearance control actuator. If you have faults with two
or more of these units, you must follow the multiple dual track check faults procedure
(Ref. TSM 73-00-00-810-901) .
(a) If the test gives the fault acronym B25TK or if there are two or more occurrences in the fault
history, continue with the fault isolation Para. 4.C.
(b) If the test does not give the fault acronym B25TK in FADEC 2A or FADEC 2B and if there is no
history of faults, send the engine back to service.
Subtask 75-30-00-710-274-A
C. Do a Test for the Fault Acronym B25L
(1) On the ENG section of the maintenance panel 50VU, select FADEC GND PWR 2 pushbutton switch
to the ON position.
NOTE: This step resets the FADEC memory.
(2) Push the INIT mode key. The INIT page comes into view.
(3) Start the engine 2 by the normal engine automatic start procedure Ref. AMM 71-00-00-710-043 or
the normal engine manual start procedure Ref. AMM 71-00-00-710-047 .
NOTE: You must operate the engine for a minimum of three minutes. If not, the LAST LEG REPORT
will not be erased and the fault will not be kept again in the EEC LAST LEG REPORT.
(4) Do the shutdown of the engine 2 by discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
(5) Read the LAST LEG REPORT and the scheduled maintenance report of the FADEC 2A and FADEC
2B menu on the MCDU (Ref. TSM 70-00-00-03) .
(a) Make a record of the failure message.
(b) Make a record of the channel FADEC 2A or FADEC 2B which found the fault.
(c) Do the CFDS message decoding and read the flight data and ground data to identify the fault
acronym.
Subtask 75-30-00-710-279-A
D. Do a Test for the Fault Acronym B25TK
(1) On the ENG section of the maintenance panel 50VU, select FADEC GND PWR 2 pushbutton switch
to the ON position.
NOTE: This step resets the FADEC memory.
(2) Do the test No. 11: high power assurance test Ref. AMM 71-00-00-710-013 .
(3) Read the LAST LEG REPORT and the scheduled maintenance report of the FADEC 2A and FADEC
2B menu on the MCDU (Ref. TSM 70-00-00-03) .
(a) Make a record of the failure message.
(b) Make a record of the channel FADEC 2A or FADEC 2B which found the fault.
(c) Do the CFDS message decoding and read the flight data and ground data to identify the fault
acronym.
4. Fault Isolation
(Ref. Fig. Failure of the LPC Bleed Master Actuator Channels A and B, on the Engine 1(2). SHEET 1)
Subtask 75-30-00-810-127-A
A. Fault Isolation for the Fault Acronym B25WAF
A torque motor Wrap Around Fault (WAF) was detected in channel A or B. The torque motor circuit for the
LPC bleed master actuator is open, short to ground or has a wire-to-wire short.
NOTE: After each step that is done during this procedure, you can do the steps in Para. 3. to make sure
the fault is corrected.
NOTE: Disconnection and connection of the electrical connectors can correct this fault.
(1) If the fault was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J3) to the LPC bleed masteractuator
(4021KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace it as necessary.
(b) If no problems were found with the harness, disconnect the electrical connector (4021KS-B) from
the LPC bleed master-actuator (4021KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel A torque motor circuit in the LPC bleed master-actuator
(4021KS) Ref. ASM 73-25-18:
1 Make sure that contacts A and B are not shorted to ground.
2 Make sure that contacts A and B are not shorted to other contacts in the connector.
3 Make sure that the resistance from contact A to contact B is between 30 and 36 ohms.
4 If a problem is found, remove and replace the ACTUATOR-MASTER, LPC
BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
(d) If no problems were found, disconnect the electrical connector (4000KS-J3) from the EEC
(4000KS). Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(e) Do this electrical check of the torque motor wiring in the channel A harness. Look for:
1 Wire-to-wire shorts and shorts to ground:
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
below 100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire-to-ground short check: Measure the resistance between the wire and the engine
metal or ground. If the resistance is below 100000 (100K) ohms, then the wire is shorted
to ground and must be repaired.
2 Continuity:
· Continuity check: Measure the resistance between the ends of the same wire. If the
resistance is more than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure the contacts are installed in the correct positions in each connector as
specified in the wiring diagram.
LPC Bleed Master Actuator LVDT Circuit Channel A Harness
LPC Bleed Master-Actuator (4021KS) EEC (4000KS)
(4021KS-B) (4000KS-J3)
Contacts Contacts
A F
B b
3 If a problem is found with the harness, repair or replace it as necessary Ref. ASM 73-25-18.
(f) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para. 3. for the fault confirmation.
1 If the test does not give the fault acronym B25WAF, send the engine back to service.
2 If the test gives the fault acronym B25WAF, remove and replace the ACTUATOR-MASTER,
LPC BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
(2) If the fault was found in channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J9) connector to the LPC bleed
master-actuator (4021KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace it as necessary.
(b) If no problems were found with the harness, disconnect the electrical connector (4021KS-B) from
the LPC bleed master-actuator (4021KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) Do this electrical check of the Channel B torque motor circuit in the LPC bleed master-actuator
(4021KS) Ref. ASM 73-25-18:
1 Make sure that contacts D and E are not shorted to ground.
2 Make sure that contacts D and E are not shorted to other contacts in the connector.
3 Make sure that the resistance from contact D to contact E is between 30 and 36 ohms.
4 If a problem is found, remove and replace the ACTUATOR-MASTER, LPC
BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
(d) If no problems were found, disconnect the electrical connector (4000KS-J9) from the EEC
(4000KS). Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(e) Do this electrical check of the torque motor wiring in the channel B harness. Look for:
1 Wire-to-wire shorts and shorts to ground:
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
below 100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire-to-ground short check: Measure the resistance between the wire and the engine
metal or ground. If the resistance is below 100000 (100K) ohms, then the wire is shorted
to ground and must be repaired.
2 Continuity:
· Continuity check: Measure the resistance between the ends of the same wire. If the
resistance is more than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure that the contacts are installed in the correct position in each connector as
specified in the wiring diagram.
LPC Bleed Master Actuator LVDT Circuit Channel B Harness
LPC Bleed Master-Actuator (4021KS) EEC (4000KS)
(4021KS-B) (4000KS-J9)
Contacts Contacts
D F
E b
3 If a problem is found with the harness, repair or replace it as necessary Ref. ASM 73-25-18.
(f) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para. 3. for the fault confirmation
1 If the test does not give the fault acronym B25WAF, send the engine back to service.
2 If the test gives the fault acronym B25WAF, remove and replace the ACTUATOR-MASTER,
LPC BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 75-30-00-710-186-A
B. Fault Isolation for the Fault Acronym B25L
The LPC bleed master actuator LVDT signal is out of range in channel A or channel B. This is caused by
an open, short to ground, or a wire-to-wire short in this circuit.
NOTE: After each step that is done during this procedure, you can do the steps in Para. 3. to make sure
the fault is corrected.
NOTE: Disconnection and connection of the electrical connectors can correct this fault.
(1) If the fault was found in channel A, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J4) to the LPC bleed masteractuator
(4021KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace it as necessary.
(b) If no problems were found with the harness, disconnect the electrical connector (4021KS-A) from
the LPC bleed master-actuator (4021KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket.You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel A LVDT circuit in the LPC bleed master-actuator (4021KS)
Ref. ASM 73-25-18:
1 Make sure that contacts A, B, C and D are not shorted to ground.
2 Make sure that contacts A, B, C and D are not shorted to other contacts in the connector.
3 Make sure the resistance from contact A to contact B is between 700 and 800 ohms.
4 Make sure the resistance from contact C to contact D is between 300 and 400 ohms.
5 If a problem is found, remove and replace the ACTUATOR-MASTER, LPC
BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
(d) If no problems were found, disconnect the electrical connector (4000KS-J4) from the EEC
(4000KS). Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(e) Do this electrical check of the LVDT wiring in the channel A harness. Look for:
1 Wire-to-wire shorts and shorts to ground:
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
below 100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire-to-ground short check: Measure the resistance between the wire and the engine
metal or ground. If the resistance is below 100000 (100K) ohms, then the wire is shorted
to ground and must be repaired.
2 Continuity:
· Continuity check: Measure the resistance between the ends of the same wire. If the
resistance is more than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure that the contacts are installed in the correct position in each connector as
specified in the wiring diagram.
LPC Bleed Master Actuator LVDT Circuit Channel A Harness
LPC Bleed Master-Actuator (4021KS) EEC (4000KS)
(4021KS-A) (4000KS-J4)
Contacts Contacts
A q
B r
C M
D e
3 If a problem is found with the harness, repair or replace it necessary Ref. ASM 73-25-18.
(f) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para. 3. for the fault confirmation.
1 If the test does not give the fault acronym B25L, send the engine back to service.
2 If the test gives the fault acronym B25L, remove and replace the ACTUATOR-MASTER,
LPC BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
(2) If the fault was found in channel B, do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J10) to the LPC bleed masteractuator
(4021KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace it as necessary.
(b) If no problems were found with the harness, disconnect the electrical connector (4021KS-B) from
the LPC bleed master-actuator (4021KS). Examine the male and female parts of the connection
Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) Do this electrical check of the channel B LVDT circuit in the LPC bleed master-actuator (4021KS)
Ref. ASM 73-25-18:
1 Make sure that contacts F, G, K and E are not shorted to ground.
2 Make sure that contacts F, G, K and E are not shorted to other contacts in the connector.
3 Make sure the resistance from contact F to contact G is between 700 and 800 ohms.
4 Make sure the resistance from contact K to contact E is between 300 and 400 ohms.
5 If a problem is found, remove and replace the ACTUATOR-MASTER, LPC
BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
(d) If no problems were found, disconnect the electrical connector (4000KS-J10) from the EEC
(4000KS). Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine the pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(e) Do this electrical check of the LVDT wiring in channel B harness. Look for:
1 Wire-to-wire shorts and shorts to ground:
· Wire-to-wire short check: Measure the resistance between the wires. If the resistance is
below 100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire-to-ground short check: Measure the resistance between the wire and the engine
metal or ground. If the resistance is below 100000 (100K) ohms, then the wire is shorted
to ground and must be repaired.
2 Continuity:
· Continuity check: Measure the resistance between the ends of the same wire. If the
resistance is more than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure that the contacts are installed in the correct position in each connector as
specified in the wiring diagram.
LPC Bleed Master Actuator LVDT Circuit Channel B Harness
LPC Bleed Master-Actuator (4021KS) EEC (4000KS)
(4021KS-A) (4000KS-J10)
Contacts Contacts
F q
G r
K M
LPC Bleed Master Actuator LVDT Circuit Channel B Harness
LPC Bleed Master-Actuator (4021KS) EEC (4000KS)
E e
3 If a problem is found with the harness, repair or replace it as necessary Ref. ASM 73-25-18.
(f) Install all the removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para. 3. for the fault confirmation.
1 If the test does not give fault acronym B25L, send the engine back to service.
2 If the test gives the fault acronym B25L, remove and replace the ACTUATOR-MASTER,
LPC BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
Subtask 75-30-00-710-275-A
C. Fault Isolation for the Fault Acronym B25TK
A Track-check fault was detected in channel A and channel B. The LPC bleed master actuator cannot
move to its commanded position or it moves slower than normal.
NOTE: After each step that is done during this procedure, you can do the steps in Para. 3. to make sure
the fault is corrected.
NOTE: This fault is typically caused by a mechanical problem and not an electrical problem.
(1) Open the thrust reverser halves Ref. AMM 78-32-00-010-010 and fan cowls as necessary Ref.
AMM 71-13-00-010-010 .
(2) Examine the LPC bleed master valve mechanism Ref. AMM 72-00-00-720-010 .
(3) Do an inspection of the LPT bleed master duct for a detached seal Ref. AMM 72-32-60-200-011 .
(4) Do the lubrication of the LPC bleed master valve mechanism Ref. AMM 72-00-00-600-011 .
(5) Do the test listed in Para. 3. for fault confirmation.
(6) If the test was satisfactory, send the engine back to service.
(7) If the test was not satisfactory, remove and replace the ACTUATOR-MASTER, LPC
BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref. AMM 75-31-42-400-010 .
(8) If this fault continues, do the steps that follow:
(a) Do the steps for the fault acronym B25WAF listed in Para. 4.A.
(b) Do the steps for the fault acronym B25L listed in Para. 4.B.
(9) If this fault continues, remove and replace the EEC ( 4000KS ) Ref. AMM 73-22-34-000-010 and
Ref. AMM 73-22-34-400-010 .
(10) If the fault continues, remove and replace the FMU ( 4000KC ) Ref. AMM 73-22-52-000-010 and
Ref. AMM 73-22-52-400-010 .
(11) If the fault continues, remove and replace the PUMP-HP/LP FUEL ( 2001EM ) Ref.
AMM 73-12-41-000-010 and Ref. AMM 73-12-41-400-010 .
5. Close-up
Subtask 75-30-00-860-128-A
A. Put the aircraft back to its initial configuration.
(1) Make sure that the thrust reverser halves 461AL and 462AR are closed Ref.
AMM 78-32-00-410-010 .
(2) Activate the thrust reverser HCU Ref. AMM 78-30-00-440-012 .
(3) Make sure that the fan cowls 447AL and 448AR are closed Ref. AMM 71-13-00-410-010 .
(4) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(5) On the ENG section of the maintenance panel 50VU, push the FADEC GND PWR 2 pushbutton
switch.
(6) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(7) Remove the warning notice(s). [Rev.6 from Feb 2017] 2026.04.04 04:37:17 UTC