Subtask 29-00-00-860-058
C. Aircraft Maintenance Configuration
(1)
Connect a ground hydraulic supply with a flowmeter to the ground test connections of the Green and Yellow hydraulic systems.
(2)
Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
(3)
On the overhead panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/G and HYD/LEAK MEASUREMENT VALVES/Y pushbutton switches (P/BSW) to off ( the OFF lights come on).
(4)
On the overhead panel 40VU, set the PTU P/BSW to off (the OFF light comes on).
(5)
Pressurize the Green and Yellow hydraulic systems (Ref. TASK 29-10-00-863-001) (Ref. TASK 29-10-00-863-002).
NOTE : The two systems should have the same pressure, or not more
____ than 300 psi difference, and the PTU must not operate.
4. Procedure
_________ Subtask 29-00-00-280-065
A. Measurement of the Internal Leakage of the PTU
(1)
Wait for the pressure and flow in the two systems to become stable.
(2)
Monitor and write down the flow (called Q1) of the Green system and of the Yellow system.
(3)
On the overhead panel 40VU, set the PTU P/BSW to on (the OFF light goes out).
(4)
Monitor and write down the flow (called Q2) of the Green system and of the Yellow system.
(5)
Subtract the value Q1 from the value Q2 for the two systems. The result must not be more than 3.5 l.min (0.9245 USgal.mn) for the Green or Yellow system.
(6)
Example:
Yellow system Q1 (PTU OFF) = 2.7 l/min.
Yellow system Q2 (PTU ON ) = 6.0 l/min.
Q2 - Q1 = 6.0 - 2.7 = 3.3 l/min (< 3.5 l/min)
-PTU internal leakage (Yellow "side") in limits
5. Close-up
________ Subtask 29-00-00-860-059
A. Put the aircraft back to the serviceable condition.
(1)
Depressurize the Green and Yellow hydraulic systems (Ref. TASK 29-10-00-864-001) (Ref. TASK 29-10-00-864-002).
(2)
On the overhead panel 50VU, lift the guard and set the HYD/LEAK MEASUREMENT VALVES/G and HYD/LEAK MEASUREMENT VALVES/Y P/BSW to on (the OFF lights go out).
(3)
De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
(4)
Disconnect the ground hydraulic supply from the aircraft ground test connections.
(5)
Install the blanking caps on the ground test connections. Subtask 29-00-00-410-057
B.
Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the access doors 197CB, 198CB.
TASK 29-00-00-280-005
Check of the Green, Yellow or Blue Hydraulic System after Operation in an Overheat Condition
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-32-29-281-001 Hydraulic Fluid Sample of Green,Blue and Yellow Systems for Analysis 12-36-29-600-001 Change the Hydraulic Fluid in the Green Hydraulic System 12-36-29-600-002 Change the Hydraulic Fluid in the Yellow Hydraulic System 12-36-29-600-003 Change the Hydraulic Fluid in the Blue Hydraulic System
3. Job Set-up
__________ Subtask 29-00-00-860-077
A. There is no special job set-up for this task.
4. Procedure
_________ Subtask 29-00-00-281-050
A. Sample Check of the Hydraulic Fluid
(1) If you operate the aircraft for more than one flight in an overheat condition (OVHT warning on the ECAM display), do the subsequent work:
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