W DOC AIRBUS | TSM A320F

Fuel - Leak Shows at Drain Mast

TASK 28-13-00-810-801-A
Fuel - Leak Shows at Drain Mast

WARNING: OBEY THE FUEL SAFETY PROCEDURES.
1. Possible Causes
  • incorrect assembly
  • damage
  • fuel sealant
  • unserviceable seal
  • damaged fuel bladder
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 28-11-00-810-801-A
Fuel - Leak Monitor 500QM (Center Tank/Wingbox) Shows Leakage
TSM TASK 28-11-00-810-802-A
Fuel - Leak Monitor 185QM (ACT Cavity) Shows Leakage
TSM TASK 28-28-00-810-837-A
Fuel - Leak Monitor 184QM (ACT Shroud) Shows Leakage
AMM 28-11-00-200-002
Check Leak Monitor for Evidence of Fuel Leakage and Correct Closure of the Valve
AMM 28-11-00-200-003
Check ACT Fuel Leak Monitor for Evidence of Fuel Leakage and Correct Closure of the Valve
AMM 28-22-00-210-001
Check APU Fuel-Pump System for Leakage from Shroud Drain Mast and APU Compartment Drain Mast with APU Fuel Pump running
AMM 28-22-00-710-001
Operational Test of the APU Fuel-Pump System on Ground to Purge the Fuel Line
AMM 28-22-00-790-002
Leak Test of the APU Fuel Line
AMM 28-22-47-000-001
Removal of the APU Fuel Line
AMM 28-22-47-400-001
Installation of the APU Fuel Line
AMM 28-25-00-650-001
Pressure Defuel
SRM 517612
AMM 51-76-12-300-001
Local Repair of the Fuel Tank Sealant
AMM 51-76-12-300-002
Repair of the Fuel Tank Fillet
3. Fault Confirmation
Subtask 28-13-00-710-050-B ** ON A/C NOT FOR ALL
A. Test
   (1) If you have a small or intermittent leak go to step 3.
   (2) If you have a large leak:
     (a) Place a container (drum - 40 gall) under the drain mast.
     (b) If necessary, defuel the aircraft AMM 28-25-00-650-001.
     (c) In accordance with the local regulations:
       1 Remove all the spilt fuel.
       2 Clean the fuel spillage from the area on the ground (hard standing).
     (d) Examine the holes in the drain mast to find which hole the fuel comes from.
NOTE: The top hole is from the APU shrouded fuel-feed line.
The bottom hole is from the center tank ventilation area.
     (e) Look for signs of fuel leakage in the areas that follow:
NOTE: The fuel leakage can be caused by incorrect assembly , damage , the natural deteriation of fuel sealant or an unserviceable seal .
       1 The main under carriage bays.
       2 The center tank.
     (f) If a fuel leak is found, repair all the leaks:
     (g) Continue with step (3).
   (3) Do the procedure Check Fuel Leak Monitor 500QM (center tank) for Evidence of Fuel Leakage AMM 28-11-00-200-002.
   (4) If:
     (a) No fuel is found in the fuel leak monitor 500QM (center tank), troubleshoot the APU fuel-feed line as follows:
NOTE: The logic for step (a) is.
The APU fuel-feed line does not have a leak monitor, if the leak monitor 500QM does not show fuel, the source must be the APU shrouded fuel-feed line.
       1 Do a Leak Test of the APU Fuel Line:
         a Do an operational test of the APU fuel pump system to purge the fuel line AMM 28-22-00-710-001.
         b Do the leak test of the APU fuel line AMM 28-22-00-790-002 or if applicable AMM 28-22-00-210-001.
         c Examine the APU Fuel Line for leaks.
NOTE: Leaks are not permitted.
         d If you find leaks, replace the items of the fuel line, as necessary AMM 28-22-47-000-001 and AMM 28-22-47-400-001.
     (b) Fuel is found in the leak monitor 500QM (center wing box), do (Ref. TSM TASK 28-11-00-810-801).
Subtask 28-13-00-710-050-D ** ON A/C NOT FOR ALL
A. Test
   (1) If you have a small or intermittent leak go to step 3.
   (2) If you have a large leak:
     (a) Place a container (drum - 40 gall) under the drain mast.
     (b) If necessary, defuel the aircraft AMM 28-25-00-650-001.
     (c) In accordance with the local regulations:
       1 Remove all the spilt fuel.
       2 Clean the fuel spillage from the area on the ground (hard standing).
     (d) Examine the holes in the drain mast to find which hole the fuel comes from.
NOTE: The top hole is from the:
  • APU shrouded fuel-feed line
  • ACT shrouded fuel transfer and vent line
  • ACT cavity/cavities (the space between an ACT bladder and the rigid structure).
The bottom hole is from the center tank ventilation area.
     (e) Look for signs of fuel leakage in the areas that follow:
NOTE: The fuel leakage can be caused by incorrect assembly , damage , the natural deteriation of fuel sealant , an unserviceable seal or a damaged fuel bladder .
       1 The main under carriage bays.
       2 The center tank.
       3 The rear cargo bay.
     (f) If a fuel leak is found, repair all the leaks:
     (g) Continue with step (3).
   (3) Do the tests that follow to find (or to make sure) which system is the source of the fuel leakage:
   (4) If:
     (a) No fuel is found in the fuel leak monitors listed, troubleshoot the APU fuel-feed line as follows:
NOTE: The logic for step (a) is.
The APU fuel-feed line does not have a leak monitor, if the three leak monitors listed/given do not show fuel, the source must be the APU shrouded fuel-feed line.
       1 Do a Leak Test of the APU Fuel Line:
         a Do an operational test of the APU fuel pump system to purge the fuel line AMM 28-22-00-710-001.
         b Do the leak test of the APU fuel line AMM 28-22-00-790-002 or if applicable AMM 28-22-00-210-001.
         c Examine the APU Fuel Line for leaks.
NOTE: Leaks are not permitted.
         d If you find leaks, replace the items of the fuel line, as necessary AMM 28-22-47-000-001 and AMM 28-22-47-400-001.
     (b) Fuel is found in the Leak monitor 500QM (center tank), do (Ref. TSM TASK 28-11-00-810-801).
     (c) Fuel is found in the Leak monitor 184QM (ACT shroud), do (Ref. TSM TASK 28-28-00-810-837).
     (d) Fuel is found in the Leak monitor 185QM (ACT cavity), do (Ref. TSM TASK 28-11-00-810-802).
4. Fault Isolation
Subtask 28-13-00-810-050-A
A. Procedure
   (1) Not applicable
[Rev.8 from Aug 2018] 2026.04.04 04:28:28 UTC
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