W DOC AIRBUS | AMM A320F

Safety Procedures of the Hydraulic System

TASK 29-00-00-910-002-A
Safety Procedures of the Hydraulic System

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
  • THE FLIGHT CONTROLS
  • THE FLIGHT CONTROL SURFACES
  • THE LANDING GEAR AND THE RELATED DOORS
  • COMPONENTS THAT MOVE.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
WARNING: MAKE SURE THAT THE HYDRAULIC SYSTEM(S) IN MAINTENANCE IS(ARE) ISOLATED BEFORE YOU PRESSURIZE THE OTHER HYDRAULIC SYSTEM(S).
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.
WARNING: ONLY OPERATE CONTROLS WHEN THE RELATED HYDRAULIC SYSTEMS ARE PRESSURIZED. IF YOU OPERATE A CONTROL WHEN THE RELATED HYDRAULIC SYSTEM IS NOT PRESSURIZED, THERE IS A RISK THAT:
  • THE CONTROL WILL BE IN A POSITION THAT DOES NOT AGREE WITH THE ITEM(S) IT OPERATES.
  • WHEN HYDRAULIC PRESSURE IS RESTORED, UNWANTED MOVEMENT OF THE HYDRAULICALLY OPERATED ITEM(S) WILL OCCUR AND CAUSE SERIOUS INJURY AND/OR DAMAGE.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
GOGGLES - PROTECTIVE
No specific
1
GROUND INTERPHONE SYSTEM
ALT29000001
1
HYD GRND PWR UNIT3000
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.02ABA1)
Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.08BAA9)
Non Aqueous Cleaner-General - -
(Material No.14SBA1)
Textile-Lint free Cotton -
3. Job Set-up
Subtask 29-00-00-860-060-A
A. Pressurization of the Hydraulic System
   (1) Operation of the hydraulic system controls when the related system is not pressurized, is not permitted.
   (2) Before you pressurize a hydraulic system:
     (a) Make sure that all persons and equipment are clear of the flight controls and the landing gear doors.
     (b) Make sure that the controls agree with the position of the items they operate.
     (c) Use only the GROUND INTERPHONE SYSTEM to get approval to pressurize the hydraulic system.
4. Procedure
Subtask 29-00-00-910-051-A
A. Hydraulic Fluid Safety Precautions
   (1) Do not mix hydraulic fluid of the phosphate ester type with hydraulic fluid of the mineral-base type. This mixture causes a jelly in the hydraulic systems which can damage the system. This could cause a reduction in aircraft safety. These types of fluid are used in the hydraulic systems and landing gear respectively. Thus there must be precautions to prevent mixture of the fluids.
   (2) Read and make sure you fully understand these precautions before you start work with hydraulic fluid.
     (a) Before you start work, clean your hands, wrists and forearms and apply barrier cream.
     (b) Apply barrier cream under your fingernails and into creases of your skin.
     (c) Put on GOGGLES - PROTECTIVE when you do pressure test components or systems, or when there is a possibility that fluid splashes into your eyes.
     (d) If hydraulic fluid gets into your eyes, immediately irrigate your eyes with clear cold water and report the incident.
     (e) Always clean your hands, wrists and forearms with soap and warm water when it was necessary to touch hydraulic fluid.
     (f) Remove clothing which is soaked with hydraulic fluid as soon as possible.
Subtask 29-00-00-941-052-A
B. Technical Precautions
NOTE: Obey these technical precautions when you work on the hydraulic system.
Hydraulic fluid causes damage to many materials, included are:
  • rubber
  • copper
  • titanium
  • plastics
  • paints.
   (1) Make sure that the hydraulic fluid does not touch the aircraft other than components in the hydraulic system. Keep to a minimum the hydraulic fluid which falls accidentally during maintenance. Clean up such hydraulic fluid so that it cannot go into adjacent areas. This is also to prevent future incorrect reports of hydraulic fluid leaks. When you clean up hydraulic fluid, use a dry Textile-Lint free Cotton - (Material No.14SBA1) and clean the area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
   (2) When you clean metal parts, before you assemble them, use only Non Aqueous Cleaner-General - - (Material No.08BAA9) . Make sure that all of the solvent is removed before you assemble the parts.
   (3) Use only approved hydraulic fluid when you fill the reservoirs, filter bowls, pumps or other hydraulic components before installation.
   (4) Make sure that you prevent the contamination of hydraulic fluids with unapproved hydraulic fluids, fuels, oil, water or unwanted material.
   (5) If a system becomes contaminated, keep the hydraulic fluid so that you can make an analysis of it.
   (6) Before you connect the ALT29000001 HYD GRND PWR UNIT3000 to the aircraft, make sure that the fluid specifications (of the cart and the aircraft) are compatible. Use Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) for the cart and for the aircraft.
NOTE: It is not permitted to use high-density fluid Skydrol 500B-4 for A320NEO family.
[Rev.10 from 2021] 2026.04.01 04:31:10 UTC
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