DOC AIRBUS | AMM A320FReplacement of the Hydraulic Fluid in the Blue Hydraulic System because of an Increased Level of Acidity when a Ground Cart is not Available
TASK 12-36-29-600-803-A
Replacement of the Hydraulic Fluid in the Blue Hydraulic System because of an Increased Level of Acidity when a Ground Cart is not Available
This is an alternative procedure for the hydraulic fluid replacement in the Blue Hydraulic System. This procedure must be used when the value of the hydraulic fluid acidity is between 1.5 and 3.5 mg KOH/g and when the Ground Cart is not available.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 12-36-29-860-153-A
Subtask 12-36-29-611-084-A
Subtask 12-36-29-410-095-A
[Rev.10 from 2021]
2026.04.02 06:46:35 UTC
Replacement of the Hydraulic Fluid in the Blue Hydraulic System because of an Increased Level of Acidity when a Ground Cart is not Available
WARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
WORK ON THE HYDRAULIC SYSTEMS CAN BE DANGEROUS.
WARNING:
DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.
WARNING:
MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:
1. Reason for the Job- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND RELATED DOORS
- COMPONENTS THAT MOVE.
This is an alternative procedure for the hydraulic fluid replacement in the Blue Hydraulic System. This procedure must be used when the value of the hydraulic fluid acidity is between 1.5 and 3.5 mg KOH/g and when the Ground Cart is not available.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 197CB, 197EB |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-29-611-001-A | Fill the Hydraulic Fluid Reservoir with a Hand Pump |
| TASK 12-32-29-281-001-A | Analyze Hydraulic Fluid |
| TASK 12-36-29-600-003-A | Change of the Hydraulic Fluid in the Blue Hydraulic System - with Ground Cart Available |
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 29-00-00-910-002-A | Safety Procedures of the Hydraulic System |
| TASK 29-10-00-680-003-A | Drainage of the Reservoir of the Blue Hydraulic System |
Subtask 12-36-29-860-153-A
A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
Subtask 12-36-29-860-154-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
B. Safety Precautions
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue Hydraulic System:
Subtask 12-36-29-010-108-A (1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue Hydraulic System:
- In the cockpit, on the HYD overhead panel 40VU.
C. Get Access
(1) Open the access door 197CB.
(2) Open the access door 197EB.
(3) Put the ACCESS PLATFORM 2M (6 FT) in position at the access door 197EB.
4. Procedure(1) Open the access door 197CB.
(2) Open the access door 197EB.
(3) Put the ACCESS PLATFORM 2M (6 FT) in position at the access door 197EB.
Subtask 12-36-29-611-084-A
A. Replacement of the Hydraulic Fluid in the Blue Hydraulic System
(1) If the acidity of the fluid in the Blue Hydraulic System is between 1.0 and 1.2 mg KOH/g, do the steps that follow in the next thirty days:
(a) Drain the reservoir of the Blue Hydraulic System (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than thirty days and after a minimum of one flight or operating with the flights controls:
(e) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next Maintenance Planning Document (MPD) check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(2) If the acidity of the fluid in the Blue hydraulic system is between 1.2 and 1.5 mg KOH/g, do the steps that follow in the next thirty days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than thirty days and after a minimum of one flight or operating with the flights controls:
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(3) If the acidity of the fluid in the Blue hydraulic system is between 1.5 and 1.8 mg KOH/g, do the steps that follow in the next fourteen days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than fourteen days and after a minimum of one flight or operating with the flights controls:
(e) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(4) If the acidity of the fluid in the Blue hydraulic system is between 1.8 and 2.2 mg KOH/g, do the steps that follow in the next fourteen days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than fourteen days and after a minimum of one flight or operating with the flights controls:
(e) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(5) If the acidity of the fluid in the Blue hydraulic system is between 2.2 and 2.5 mg KOH/g, do the steps that follow in the next fourteen days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than fourteen days and after a minimum of one flight or operating with the flights controls:
(e) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(6) If the acidity of the fluid in the Blue hydraulic system is between 2.5 and 3.5 mg KOH/g, do the steps that follow in less than three flights:
(b) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(c) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(7) If the acidity of the fluid in the Blue hydraulic system is more than 3.5 mg KOH/g, do the steps that follow:
(b) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(c) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
5. Close-up(1) If the acidity of the fluid in the Blue Hydraulic System is between 1.0 and 1.2 mg KOH/g, do the steps that follow in the next thirty days:
(a) Drain the reservoir of the Blue Hydraulic System (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than thirty days and after a minimum of one flight or operating with the flights controls:
- Replace the Hydraulic Fluid in the reservoir a second time (Ref. AMM TASK 29-10-00-680-003) and (Ref. AMM TASK 12-12-29-611-001).
(e) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next Maintenance Planning Document (MPD) check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(2) If the acidity of the fluid in the Blue hydraulic system is between 1.2 and 1.5 mg KOH/g, do the steps that follow in the next thirty days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than thirty days and after a minimum of one flight or operating with the flights controls:
- Replace the Hydraulic Fluid in the reservoir a second time (Ref. AMM TASK 29-10-00-680-003) and (Ref. AMM TASK 12-12-29-611-001).
- Replace the hydraulic fluid in the reservoir a third time (Ref. AMM TASK 29-10-00-680-003) and (Ref. AMM TASK 12-12-29-611-001).
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(3) If the acidity of the fluid in the Blue hydraulic system is between 1.5 and 1.8 mg KOH/g, do the steps that follow in the next fourteen days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than fourteen days and after a minimum of one flight or operating with the flights controls:
- Replace the Hydraulic Fluid in the reservoir a second time (Ref. AMM TASK 29-10-00-680-003) and (Ref. AMM TASK 12-12-29-611-001).
(e) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(4) If the acidity of the fluid in the Blue hydraulic system is between 1.8 and 2.2 mg KOH/g, do the steps that follow in the next fourteen days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than fourteen days and after a minimum of one flight or operating with the flights controls:
- Replace the Hydraulic Fluid in the reservoir a second time (Ref. AMM TASK 29-10-00-680-003) and (Ref. AMM TASK 12-12-29-611-001).
(e) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(5) If the acidity of the fluid in the Blue hydraulic system is between 2.2 and 2.5 mg KOH/g, do the steps that follow in the next fourteen days:
(a) Drain the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-10-00-680-003).
(b) Fill the reservoir of the Blue Hydraulic System with a hand pump (Ref. AMM TASK 12-12-29-611-001).
(c) In less than fourteen days and after a minimum of one flight or operating with the flights controls:
- Replace the Hydraulic Fluid in the reservoir a second time (Ref. AMM TASK 29-10-00-680-003) and (Ref. AMM TASK 12-12-29-611-001).
(e) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(f) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(6) If the acidity of the fluid in the Blue hydraulic system is between 2.5 and 3.5 mg KOH/g, do the steps that follow in less than three flights:
NOTE: If there is a contamination in more than one system, no period is permitted.
(a) Change of the Hydraulic Fluid in the Blue Hydraulic System (Ref. AMM TASK 12-36-29-600-003). (b) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(c) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
(7) If the acidity of the fluid in the Blue hydraulic system is more than 3.5 mg KOH/g, do the steps that follow:
NOTE: The grace period is not permitted.
(a) Change of the Hydraulic Fluid in the Blue Hydraulic System (Ref. AMM TASK 12-36-29-600-003). (b) Take a new sample minimum after 1 FC and in seven days. Test result must be available in 30 days.
(c) If acidity level is less than 1, make an analysis of the hydraulic fluid at the next MPD check, or in the next 12 months, the one that occurs first (Ref. AMM TASK 12-32-29-281-001).
Subtask 12-36-29-410-095-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 197CB and 197EB.
Subtask 12-36-29-860-155-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access doors 197CB and 197EB.
B. Put the aircraft back to its initial configuration.
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).