DOC AIRBUS | TSM A320FFuel or Oil Leaks from the Overboard Drains Mast on Engine 1
1. Possible Causes
· FMU ( 4000KC )
· VALVE-FUEL DIVERTER AND RETURN ( 4018KS )
· ACTUATOR-MASTER, LPC BLEED ( 4021KS )
· ACTUATOR-VSV ( 4022KS )
· ACTUATOR-ACC ( 4027KS )
· LPC bleed-slave actuator
· MODULATING VALVE-ACOC ( 4019KS )
· PUMP-HP/LP FUEL ( 2001EM )
· fuel pump drive seal
· IDG ( 4000XU )
· IDG drive seal
· STARTER ( 100KM )
· starter drive seal
· PUMP VARIABLE DTS ( 1030GK )
· hydraulic pump drive seal
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-21-51-000-010 Removal of the Integrated Drive Generator -IDG 1(2)
Ref. AMM 24-21-51-400-010 Installation of the Integrated Drive Generator -IDG 1(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 29-11-51-000-010 Removal of the Engine Pump
Ref. AMM 29-11-51-400-010 Installation of the Engine Pump
Ref. AMM 31-60-00-860-001 EIS Start Procedure
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 71-70-00-600-010 Leakage Rates at Drains Mast
Ref. AMM 72-60-22-000-010 Removal of the Starter Drive Seal Assembly and Mating Ring
Ref. AMM 72-60-22-400-010 Installation of the Starter Drive Seal Assembly and Mating Ring
Ref. AMM 72-60-23-000-010 Removal of the Hydraulic Pump Drive Seal Assembly and Mating Ring
Ref. AMM 72-60-23-400-010 Installation of the Hydraulic Pump Drive Seal Assembly Mating Ring
Ref. AMM 72-60-25-000-010 Removal of the Fuel Pump Drive Seal Assembly and Mating Ring
Ref. AMM 72-60-25-400-010 Installation of the Fuel Pump Drive Seal Assembly and Mating Ring
Ref. AMM 72-60-28-000-010 Removal of the IDG Drive Seal Assembly and Mating Ring
Ref. AMM 72-60-28-400-010 Installation of the IDG Drive Seal Assembly and Mating Ring
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 73-13-42-000-010 Removal of the Fuel Diverter and Return Valve
Ref. AMM 73-13-42-400-010 Installation of the Fuel Diverter and Return Valve
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. AMM 75-24-52-000-010 Removal of the High Pressure Turbine/Low Pressure Turbine (HPT/
LPT) Valve Actuator
Ref. AMM 75-24-52-400-010 Installation of the High Pressure Turbine/Low Pressure Turbine (HPT/
LPT) Valve Actuator
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 75-31-43-000-010 Removal of the Low Pressure Compressor (LPC) Bleed-Slave Actuator
Ref. AMM 75-31-43-400-010 Installation of the Low Pressure Compressor (LPC) Bleed-Slave Actuator
Ref. AMM 75-32-41-000-010 Removal of the Variable Stator Vane (VSV) Actuator
Ref. AMM 75-32-41-400-010 Installation of the Variable Stator Vane (VSV) Actuator
Ref. AMM 79-21-51-000-010 Removal of the Air Cooled Oil Cooler (ACOC) Modulating Valve
Ref. AMM 79-21-51-400-010 Installation of the Air Cooled Oil Cooler (ACOC) Modulating Valve
Ref. AMM 80-13-41-000-010 Removal of the Starter
Ref. AMM 80-13-41-400-010 Installation of the Starter
3. Fault Confirmation
Subtask 71-70-00-860-050-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG/FADEC GND PWR/1 pushbutton switch.
(3) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
Ref. AMM 31-60-00-860-001 .
Subtask 71-70-00-710-058-A
B. Test
(1) Do a drains mast leakage test Ref. AMM 71-70-00-600-010 .
4. Fault Isolation
Subtask 71-70-00-810-054-A
A. FMU drain
(1) If fuel leakage from the FMU drain is more than the limit, replace the FMU ( 4000KC ) Ref.
AMM 73-22-52-000-010 and Ref. AMM 73-22-52-400-010 .
Subtask 71-70-00-810-055-A
B. FDRV drain
(1) If fuel leakage from the FDRV drain is more than the limit, replace the VALVE-FUEL DIVERTER
AND RETURN ( 4018KS ) Ref. AMM 73-13-42-000-010 and Ref. AMM 73-13-42-400-010 .
Subtask 71-70-00-810-056-A
C. Common core drain
(1) If fuel leakage from the common core drain is more than the limit, disconnect the drain tubes at the
four way connector to isolate the defective component.
(2) Replace the ACTUATOR-MASTER, LPC BLEED ( 4021KS ) Ref. AMM 75-31-42-000-010 and Ref.
AMM 75-31-42-400-010 , the ACTUATOR-VSV ( 4022KS ) Ref. AMM 75-32-41-000-010 and Ref.
AMM 75-32-41-400-010 , the ACTUATOR-ACC ( 4027KS ) Ref. AMM 75-24-52-000-010 and Ref.
AMM 75-24-52-400-010
or the LPC bleed-slave actuator Ref. AMM 75-31-43-000-010 and Ref. AMM 75-31-43-400-010 as
applicable.
Subtask 71-70-00-810-057-A
D. ACOC drain
(1) If fuel leakage from the ACOC drain is more than the limit, replace the MODULATING VALVEACOC
( 4019KS ) Ref. AMM 79-21-51-000-010 and Ref. AMM 79-21-51-400-010 .
Subtask 71-70-00-810-058-A
E. LP/HP fuel pump drain
(1) If fuel leakage from the fuel pump drain is more than the limit, replace the PUMP-HP/LP
FUEL ( 2001EM ) Ref. AMM 73-12-41-000-010 and Ref. AMM 73-12-41-400-010 .
(2) If oil leakage from the fuel pump drain is more than the limit, replace the fuel pump drive seal Ref.
AMM 72-60-25-000-010 and Ref. AMM 72-60-25-400-010 .
Subtask 71-70-00-810-059-A
F. IDG drain
(1) If oil leakage from the IDG drain is more than the limit, replace the IDG ( 4000XU ) Ref.
AMM 24-21-51-000-010 and Ref. AMM 24-21-51-400-010 .
(2) If the fault continues, replace the IDG drive seal Ref. AMM 72-60-28-000-010 and Ref.
AMM 72-60-28-400-010 .
Subtask 71-70-00-810-060-A
G. Starter drain
(1) If oil leakage from the starter drain is more than the limit, replace the STARTER ( 100KM ) Ref.
AMM 80-13-41-000-010 and Ref. AMM 80-13-41-400-010 .
(2) If the fault continues, replace the starter drive seal Ref. AMM 72-60-22-000-010 and Ref.
AMM 72-60-22-400-010 .
Subtask 71-70-00-810-061-A
H. Hydraulic pump drain
(1) If hydraulic fluid leakage from the hydraulic pump drain is more than the limit, replace the PUMP
VARIABLE DTS ( 1030GK ) Ref. AMM 29-11-51-000-010 and Ref. AMM 29-11-51-400-010 .
(2) If engine oil leakage from the hydraulic pump drain is more than the limit, replace the hydraulic pump
drive seal Ref. AMM 72-60-23-000-010 and Ref. AMM 72-60-23-400-010 .
Subtask 71-70-00-710-059-A
J. Do the test given in Para. 3.
5. Close-up
Subtask 71-70-00-860-051-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU push the ENG/FADEC GND PWR/1 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 . [Rev.6 from Feb 2017] 2026.04.04 04:35:08 UTC