A320飞机维护手册 AMM HYDRAULIC POWER 液压6(78)

R (8) Put the wheel chocks in front of and behind the wheels of the main R and the nose landing gears.
 Subtask 29-23-00-865-061
 B. Make sure that this(these) circuit breaker(s) is(are) closed:
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121VU HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST 1881GP N35

 4. Procedure
_________
 (Ref. Fig. 501/TASK 29-23-00-991-002)
 Subtask 29-23-00-710-054
 A. Operational Test of the PTU with the Engine Pumps
 WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES
_______ ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
R WARNING : MAKE SURE THAT THE WHEEL CHOCKS ARE IN POSITION.
_______
 CAUTION : DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND
_______ POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.
 NOTE : To prevent damage to the PTU:
____
 -make sure that the air pressure in the Green and Yellow reservoirs does not fall below 3 bar (43.5113 psi).
 (1) Make sure that the isolation coupling of the PTU is connected.
R (2) Make sure that the nose wheel steering is activated.
 (3)
 Make sure that the PTU P/BSW on the panel 40VU is in the AUTO position (OFF light not on).

 (4)
 Do this test:

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1. Start the right engine to  On the ECAM lower DU: pressurize the Yellow hydraulic system (Ref. TASK 71-00-00-710-- during the start-up of the left 003). engine, the pressure in the Yellow Start the left engine (Ref. TASK hydraulic system is between 2900 and 71-00-00-710-003) 3100 psi
 -during the start-up of the left engine, the pressure in the Green hydraulic system is between 2200 and 3150 psi

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ACTION RESULT -------------------------------------------------------------------------------
-after the start-up of the left engine, when the engine operates at idle, the pressure in the Green hydraulic system is between 2900 and 3100 psi
 -with the left and the right engine at idle, the PTU does not operate
 2. On the panel 40VU:  On the panel 40VU:
 -press the GREEN/ENG 1 PUMP  - the GREEN/ENG 1 PUMP OFF light comes P/BSW on
 -
the PTU starts to transfer hydraulic power from the Yellow to the Green hydraulic system

 The ECAM lower DU shows:

 -
the pressure in the Green hydraulic system is between 2200 and 3150 psi

 NOTE : When the PTU starts, the
____ pressure in the Yellow hydraulic system could decrease to 2000 psi for a short time.
 -
the PTU stops when the pressure in the Green hydraulic system is between 2800 and 3150 psi

 -
the PTU starts again when the pressure in the Green hydraulic system is between 2200 and 2850 psi

 NOTE : The PTU operates intermittently
____ between the given limits.
 NOTE : The PTU delivery pressure in the
____ Green hydraulic system fluctuates in low flow conditions. The difference in pressure between the stop and the start of the PTU is 200 psi minimum.
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ACTION RESULT -------------------------------------------------------------------------------
3.
 Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal not less than five times fully forward to operate the rudder

 4.
 Put the rudder pedals to the neutral position

 5.
 On the panel 40VU:

-press the GREEN/ENG 1 PUMP P/BSW
6. On the panel 40VU:
-push the PTU P/BSW
7. On the panel 40VU:
-press the YELLOW/ENG 2 PUMP P/BSW
8. On the ECAM lower DU:
 -let the pressure in the Yellow hydraulic system decrease to 200 psi or less, then:
 9. On the panel 40VU:
-push the PTU P/BSW
NOTE : If the PTU runs continuously, do
____ a leakage check of the Green hydraulic system (Ref. TASK 29-00-00-280-001).
On the ECAM lower DU:
-the pressure in the Green hydraulicsystem is between 2200 and 3150 psi
On the panel 40VU:
-
the GREEN/ENG 1 PUMP OFF light goesoff

 On the ECAM lower DU: