W DOC AIRBUS | AMM A320F

Oil Sampling for Analysis

TASK 12-32-49-281-001-A
Oil Sampling for Analysis

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION: DO NOT START THE APU WITH ACCESS DOORS 315AL AND 316AR OPEN/REMOVED. THE APU FIRE EXTINGUISHER SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/REMOVED.
1. Reason for the Job
To find the cause of the oil contamination (fuel, oil degradation and other causes).
NOTE: You must get the sample 15 to 30 minutes after APU shutdown and before you add oil to the tank.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific
AR
BOTTLE - PLASTIC
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
98L12003001000
AR
HARNESS,SAFETY
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14SBA1)
Textile-Lint free Cotton -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
315AL
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 24-42-00-861-001-A
Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A
De-energize the Ground Service Network Supplied from the External Power
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-002-A
Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01
Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 49-90-00-600-004-A
Check Oil Level and Replenish (APS 3200)
TASK 49-90-00-600-007-A
Check Oil Level and Replenish (131-9(A))
TASK 52-41-00-010-001-A
Open the APU Doors for Access
TASK 52-41-00-410-001-A
Close the APU Doors after Access
F Oil Sampling for Analysis ** ON A/C NOT FOR ALL
F Oil Sampling for Analysis ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 12-32-49-860-050-A
A. Aircraft Maintenance Configuration
   (1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
   (2) On overhead panel 25VU, make sure that the APU MASTER SW pushbutton switch is released (ON legend is off).
   (3) On the APU section of overhead panel 25VU, put a WARNING NOTICE(S) to tell persons not to start the APU.
   (4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
Subtask 12-32-49-865-050-A
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUAPU/APU/CTL2KDL42
121VUAPU/ECB/SPLY1KDL41
Subtask 12-32-49-010-050-A
C. Get Access
WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.
   (1) Put on and attach the HARNESS, SAFETY before you start work in the work area.
   (2) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below APU access door 315AL.
   (3) Open APU access door 315AL (Ref. AMM TASK 52-41-00-010-001).
   (4) Set the light switch 11LJ to the ON position.
4. Procedure
Subtask 12-32-49-281-050-A
A. Get a sample.
   (1) Clean the oil tank scupper:
WARNING: DO NOT REMOVE THE FILLER CAP OF THE OIL TANK IMMEDIATELY AFTER ENGINE OPERATION. LET THE OIL PRESSURE DECREASE FOR A MINIMUM OF 5 MINUTES AFTER THE ENGINE SHUTDOWN. IF YOU OPEN THE FILLER CAP WHEN THERE IS PRESSURE IN THE TANK, THE OIL CAN BURN YOU DANGEROUSLY.
CAUTION: MAKE SURE THAT THE OIL TANK SCUPPER IS CLEAN TO PREVENT CONTAMINATION OF THE TANK DURING THE SERVICING OPERATIONS.
     (a) Clean the oil tank scupper with a Textile-Lint free Cotton - (Material No.14SBA1) .
   (2) Remove the oil filter cap (1).
   (3) Open the oil tank:
CAUTION: USE A NEW AND VERY CLEAN PLASTIC BOTTLE WITH A NEW SCREW TOP AND A NEW PLASTIC TUBE. DO NOT USE THESE ITEMS AGAIN.
     (a) With your hand, apply pressure on the BOTTLE - PLASTIC (2) and put the free end of the tube into the oil through the filling port (3).
     (b) Release the pressure on the bottle to get the oil sample.
     (c) Fill the BOTTLE - PLASTIC (2) with a quantity of 0.1 to 0.2 l (0.0264 to 0.05 USgal) of oil.
   (4) Tag the oil sample with these data:
  • Total operation time of the APU
  • Operation time since the last oil sampling
  • Sampling date
  • Identification of the APU (Serial Number)
  • Type and brand of the oil used.
   (5) Send immediately the oil sample to the laboratory for an oil analysis to find the total acid number and the water contamination value.
   (6) Make sure that you get the results that follow:
     (a) The total acidity number is given in mg KOH/g. The total-acidity number limit is from the oil manufacturer. If the oil manufacturer gave no total-acidity number limit, use a maximum value of 2.0 mg KOH/g.
     (b) The water contamination is less than 800 ppm.
   (7) Do a check of the oil level in the oil tank.
     (a) If there is not sufficient oil, fill the oil tank:
   (8) Close the oil tank.
   (9) Install the filter cap (1).
5. Close-up
Subtask 12-32-49-410-050-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Set the light switch 11LJ to the OFF position.
   (3) Close APU access door 315AL (Ref. AMM TASK 52-41-00-410-001).
   (4) Remove the access platform(s).
   (5) Remove the safety harness.
Subtask 12-32-49-865-051-A
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUAPU/APU/CTL2KDL42
121VUAPU/ECB/SPLY1KDL41
Subtask 12-32-49-860-051-A
C. Put the aircraft back to its initial configuration.
   (1) Pressurize the reservoirs of the hydraulic systems.
(Ref. AMM TASK 29-14-00-614-002).
   (2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
   (3) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.03.31 22:58:06 UTC
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