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REFERENCE DESIGNATION -------------------------------------------------------------------------------
29-10-00-863-002 Pressurize the Yellow Hydraulic System 29-10-00-863-003 Pressurize the Blue Hydraulic System with a Ground
Power Supply 29-10-00-864-001 Depressurize the Green Hydraulic System 29-10-00-864-002 Depressurize the Yellow Hydraulic System 29-10-00-864-003 Depressurize the Blue Hydraulic System 71-00-00-790-006 Leak Check after the Replacement of a Sealol Seal or
a Magnetic Seal on the AGB Drive Pads of the IDG, Hydraulic Pump, Starter and Fuel Pump
3. Job Set-up
__________
Subtask 29-00-00-910-052
A. Standard Practices
NOTE : If you do the check of external leaks because a complete loss of
____
the hydraulic system has occured with the:
-RSVR LO LVL warning on the upper ECAM DU of the related hydraulic system and
- operation of the engine driven pump for more than 5 minutes you must do the check of the Green or Yellow hydraulic system after operation in a possible cavitation condition of the engine pump (Ref. TASK 29-00-00-280-006).
(1) For a correct analysis of component leak rates and leakage checks, you must obey the subsequent steps:
(a)
Before you do a check on a hydraulic system that has not operated during its time in storage, you must:
-pressurize the system and operate the components
-remove all the signs of hydraulic fluid and clean the surface of the component.
(b)
Hydraulic tube connections seal when you force the metal-to-metal surfaces of the component parts together. If you find a leak at a hydraulic tube connection, you must tighten the nut to the specified torque. If the leak continues, you must replace the defective components.
(c)
If possible, operate the components for some cycles before you do an external leak check.
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(d) Do a check of the dynamic seals of pistons, slide valves and swivel joints with the system pressurized, but do not operate the components. The dynamic seals move only with a short time interval, and some cannot easily be monitored when they operate.
Subtask 29-00-00-010-050
B. Get Access
(1)
Get access to the applicable component. Subtask 29-00-00-941-050
C.
Preparation for Check
(1) If the component has a seal drain connection, disconnect the drain pipe from it.
NOTE : The motors of the Trimmable Horizontal Stabilizer (THS)
____ actuator have seal drain connections, but do not have related drain pipes.
(2)
Make sure that the surface of the component is clean and that you remove all the hydraulic fluid and the fluid stains.
(3)
Put a piece of cloth or paper below the component, to absorb the fluid. Make sure that it does not touch parts which turn or move.
4. Procedure
_________ Subtask 29-00-00-863-050-A
A. Pressurize the Hydraulic System WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE
_______ CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
(1)
Pressurize the necessary hydraulic system(s):
-
for the Green hydraulic system (Ref. TASK 29-10-00-863-001)
-
for the Yellow hydraulic system (Ref. TASK 29-10-00-863-002)
-
for the Blue hydraulic system (Ref. TASK 29-10-00-863-003).
(2)
If it is necessary to do a check of the external leaks of the engine driven pumps, do an engine run of the applicable engine (Ref. TASK 71-00-00-790-006).
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R **ON A/C 001-049, 051-061, 101-105, 201-203,
Subtask 29-00-00-790-050
B. External Leak Test of the Component
(1)
Operate the component.
(2)
Do an inspection of the component for external leaks. If you find leaks, you must compare the quantity of the leaks with the values given in the table below:
-------------------------------------------------------------------------------| Equipment | Normal Operation Limit | Dispatch Limit to | | | | Avoid Delay | |---------------------------|------------------------|------------------------| |1. HYDRAULIC PUMP | | | | Engine Driven Pump (EDP) | | | | Electric Motor Pump (EMP)| | | | Ram Air Turbine (RAT) | | | | Power Transfer Unit (PTU)| | | |---------------------------|------------------------|------------------------| | Static Seals | None | 2 drops in 10 min. | |---------------------------|------------------------|------------------------| | Static Casing | 1 drop in 10 min. | 1 drop/min. | |---------------------------|------------------------|------------------------| | Shaft Seal | 2 drops/min. | 8 drops/min. | | (system pressurized) | RAT: 2 drops/hour | RAT: 6 drops/hour | |---------------------------|------------------------|------------------------| | Shaft Seal | EDP: 5 drops/min. | EDP: 60 drops/min. | | (in operation) | EMP: 5 drops/min. | EMP: 30 drops/min. | | | RAT: 1 drop/min. | RAT: 1 drop/min. | | | PTU: 5 drops/min. | PTU: 30 drops/min. | |---------------------------|------------------------|------------------------| |2. SERVOCONTROL | | | | Elevator | | | | Aileron | | | | Rudder | | | | Spoiler | | | |---------------------------|------------------------|------------------------| | Yaw Damper | (see NOTE 4.) | (see NOTE 4.) | |---------------------------|------------------------|------------------------| | Static Seal | None | 2 drops in 10 min. | | (system pressurized) | | | |---------------------------|------------------------|------------------------| | Dynamic Seal | 1 drop in 10 min. | Elevator: 6 drops in |
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